FN Thomson Reuters Web of Science™ VR 1.0 PT J AU Alonso, S Cabrerizo, FJ Herrera-Viedma, E Herrera, F AF Alonso, S. Cabrerizo, F. J. Herrera-Viedma, E. Herrera, F. TI h-Index: A review focused in its variants, computation and standardization for different scientific fields SO JOURNAL OF INFORMETRICS LA English DT Review DE h-Index; Bibliometric indicators ID SELF-CITATION CORRECTIONS; WEB-OF-SCIENCE; EGGHES G-INDEX; HIRSCH-INDEX; GOOGLE SCHOLAR; RESEARCH PERFORMANCE; IMPACT FACTOR; R-INDEX; A-INDEX; INDICATORS AB The h-index and some related bibliometric indices have received a lot of attention from the scientific community in the last few years due to some of their good properties ( easiness of computation, balance between quantity of publications and their impact and so on). Many different indicators have been developed in order to extend and overcome the drawbacks of the original Hirsch proposal. In this contribution we present a comprehensive review on the h-index and related indicators field. From the initial h-index proposal we study their main advantages, drawbacks and the main applications that we can find in the literature. A description of many of the h-related indices that have been developed along with their main characteristics and some of the works that analyze and compare them are presented. We also review the most up to date standardization studies that allow a fair comparison by means of the h-index among scientists from different research areas and finally, some works that analyze the computation of the h-index and related indices by using different citation databases (ISI Citation Indexes, Google Scholar and Scopus) are introduced. (C) 2009 Elsevier Ltd. All rights reserved. C1 [Alonso, S.] Univ Granada, Software Engn Dept, E-18071 Granada, Spain. [Herrera-Viedma, E.; Herrera, F.] Univ Granada, Dept Comp Sci & Artificial Intelligence, E-18071 Granada, Spain. RP Alonso, S (reprint author), Univ Granada, Software Engn Dept, Periodista Daniel Saucedo Aranda S-N, E-18071 Granada, Spain. 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Informetr. PD OCT PY 2009 VL 3 IS 4 BP 273 EP 289 DI 10.1016/j.joi.2009.04.001 PG 17 WC Information Science & Library Science SC Information Science & Library Science GA 484VB UT WOS:000269075100001 ER PT J AU Moed, HF AF Moed, Henk F. TI Measuring contextual citation impact of scientific journals SO JOURNAL OF INFORMETRICS LA English DT Article DE Journal metrics; Journal impact factor; Reference practices; Database coverage; Scopus; Source normalization ID TOOL; SYSTEM; OUTPUT AB This paper explores a new indicator of journal citation impact, denoted as source normalized impact per paper (SNIP). It measures a journal's contextual citation impact, taking into account characteristics of its properly defined subject field, especially the frequency at which authors cite other papers in their reference lists, the rapidity of maturing of citation impact, and the extent to which a database used for the assessment covers the field's literature. It further develops Eugene Garfield's notions of a field's 'citation potential' defined as the average length of references lists in a field and determining the probability of being cited, and the need in fair performance assessments to correct for differences between subject fields. A journal's subject field is defined as the set of papers citing that journal. SNIP is defined as the ratio of the journal's citation count per paper and the citation potential in its subject field. It aims to allow direct comparison of sources in different subject fields. Citation potential is shown to vary not only between journal subject categories - groupings of journals sharing a research field - or disciplines (e. g., journals in mathematics, engineering and social sciences tend to have lower values than titles in life sciences), but also between journals within the same subject category. For instance, basic journals tend to show higher citation potentials than applied or clinical journals, and journals covering emerging topics higher than periodicals in classical subjects or more general journals. SNIP corrects for such differences. Its strengths and limitations are critically discussed, and suggestions are made for further research. All empirical results are derived from Elsevier's Scopus. (C) 2010 Elsevier Ltd. All rights reserved. C1 Leiden Univ, Ctr Sci & Technol Studies CWTS, NL-2300 AX Leiden, Netherlands. RP Moed, HF (reprint author), Leiden Univ, Ctr Sci & Technol Studies CWTS, POB 905, NL-2300 AX Leiden, Netherlands. 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PD JUL PY 2010 VL 4 IS 3 BP 265 EP 277 DI 10.1016/j.joi.2010.01.002 PG 13 WC Information Science & Library Science SC Information Science & Library Science GA 607YQ UT WOS:000278543600007 ER PT J AU Costas, R Bordons, M AF Costas, Rodrigo Bordons, Maria TI The h-index: Advantages, limitations and its relation with other bibliometric indicators at the micro level SO JOURNAL OF INFORMETRICS LA English DT Article DE h-index; bibliometric indicators; micro-level studies; individual scientific performance; individual scientific assessment; research evaluation ID HIRSCH-INDEX; PUBLICATION; SCIENCE; SCIENTISTS; JOURNALS; RANKING; SYSTEM; IMPACT; OUTPUT AB The relationship of the h-index with other bibliometric indicators at the micro level is analysed for Spanish CSIC scientists in Natural Resources, using publications downloaded from the Web of Science (1994-2004). Different activity and impact indicators were obtained to describe the research performance of scientists in different dimensions, being the h-index located through factor analysis in a quantitative dimension highly correlated with the absolute number of publications and citations. The need to include the remaining dimensions in the analysis of research performance of scientists and the risks of relying only on the h-index are stressed. The hypothesis that the achievement of some highly visible but intermediate-productive authors might be underestimated when compared with other scientists by means of the h-index is tested. (c) 2007 Elsevier Ltd. All rights reserved. C1 [Costas, Rodrigo; Bordons, Maria] CSIC, CINDOC, Madrid 28002, Spain. RP Costas, R (reprint author), CSIC, CINDOC, Joaquin Costa 22, Madrid 28002, Spain. 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Informetr. PD JUL PY 2007 VL 1 IS 3 BP 193 EP 203 DI 10.1016/j.joi.2007.02.001 PG 11 WC Information Science & Library Science SC Information Science & Library Science GA 272BE UT WOS:000253831700003 ER PT J AU Lundberg, J AF Lundberg, Jonas TI Lifting the crown-citation z-score SO JOURNAL OF INFORMETRICS LA English DT Article DE citation; indicator; normalization; research assessment; z-score ID SCIENCE; INDEX AB Researchers worldwide are increasingly being assessed by the citation rates of their papers. These rates have potential impact on academic promotions and funding decisions. Currently there are several different ways that citation rates are being calculated, with the state of the art indicator being the crown indicator. This indicator has flaws and improvements could be considered. An item oriented field normalized citation score average ((c) over bar (f)) is an incremental improvement as it differs from the crown indicatorin so much as normalization takes place on the level of individual publication (or item) rather than on aggregated levels, and therefore assigns equal weight to each publication. The normalization on item level also makes it possible to calculate the second suggested indicator: total field normalized citation score (Sigma c(f)). A more radical improvement (or complement) is suggested in the item oriented field normalized logarithm-based citation z-score average ((c) over bar (fz[ln]) or citation z-score). This indicator assigns equal weight to each included publication and takes the citation rate variability of different fields into account as well as the skewed distribution of citations over publications. 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Informetr. PD APR PY 2007 VL 1 IS 2 BP 145 EP 154 DI 10.1016/j.joi.2006.09.007 PG 10 WC Information Science & Library Science SC Information Science & Library Science GA 269JI UT WOS:000253644900005 ER PT J AU Chen, P Xie, H Maslov, S Redner, S AF Chen, P. Xie, H. Maslov, S. Redner, S. TI Finding scientific gems with Google's PageRank algorithm SO JOURNAL OF INFORMETRICS LA English DT Article DE Google PageRank algorithm; scientific gems; physical review; citations AB We apply the Google PageRank algorithm to assess the relative importance of all publications in the Physical Review family of journals from 1893 to 2003. While the Google number and the number of citations for each publication are positively correlated, outliers from this linear relation identify some exceptional papers or "gems" that are universally familiar to physicists. (c) 2006 Published by Elsevier Ltd. C1 [Chen, P.; Redner, S.] Boston Univ, Ctr Polymer Studies, Boston, MA 02215 USA. [Chen, P.; Redner, S.] Boston Univ, Dept Phys, Boston, MA 02215 USA. [Xie, H.] CUNY, New Media Lab, Grad Ctr, New York, NY 10016 USA. [Xie, H.; Maslov, S.] Brookhaven Natl Lab, Dept Condensed Matter Phys & Mat Sci, Upton, NY 11973 USA. RP Chen, P (reprint author), Boston Univ, Ctr Polymer Studies, Boston, MA 02215 USA. EM patrick@bu.edu; hxie@bnl.gov; maslov@bnl.gov; redner@bu.edu RI Maslov, Sergei/C-2397-2009 OI Maslov, Sergei/0000-0002-3701-492X CR Ball P, 2006, NATURE, V439, P770, DOI 10.1038/439770a Bollen J, 2006, SCIENTOMETRICS, V69, P669, DOI 10.1007/s11192-006-0176-z BONACICH P, 1987, AM J SOCIOL, V92, P1170, DOI 10.1086/228631 Brin S, 1998, COMPUT NETWORKS ISDN, V30, P107, DOI 10.1016/S0169-7552(98)00110-X Fortunato S, 2006, PHYS REV LETT, V96, DOI 10.1103/PhysRevLett.96.218701 FORTUNATO S, CSIR0511016 Kleinberg JM, 1999, J ACM, V46, P604, DOI 10.1145/324133.324140 Laherrere J, 1998, EUR PHYS J B, V2, P525, DOI 10.1007/s100510050276 PRICE DJD, 1976, J AM SOC INFORM SCI, V27, P292, DOI 10.1002/asi.4630270505 PRICE DJD, 1965, SCIENCE, V149, P510 Redner S, 2005, PHYS TODAY, V58, P49, DOI 10.1063/1.1996475 Redner S, 1998, EUR PHYS J B, V4, P131, DOI 10.1007/s100510050359 NR 12 TC 105 Z9 112 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 1751-1577 J9 J INFORMETR JI J. Informetr. PD JAN PY 2007 VL 1 IS 1 BP 8 EP 15 DI 10.1016/j.joi.2006.06.001 PG 8 WC Information Science & Library Science SC Information Science & Library Science GA 274AN UT WOS:000253974300003 ER PT J AU Craig, ID Plume, AM McVeigh, ME Pringle, J Amin, M AF Craig, Iain D. Plume, Andrew M. McVeigh, Marie E. Pringle, James Amin, Mayur TI Do open access articles have greater citation impact? A critical review of the literature SO JOURNAL OF INFORMETRICS LA English DT Review DE open access; citation analysis; early view; quality bias AB The last few years have seen the emergence of several open access options in scholarly communication which can broadly be grouped into two areas referred to as 'gold' and 'green' open access (OA). In this article we review the literature examining the relationship between OA status and citation counts of scholarly articles. Early studies showed a correlation between the free online availability or OA status of articles and higher citation counts, and implied causality without due consideration of potential confounding factors. More recent investigations have dissected the nature of the relationship between article CA status and citations. Three non-exclusive postulates have been proposed to account for the observed citation differences between OA and non-OA articles: an open access postulate, a selection bias postulate, and an early view postulate. The most rigorous study to date (in condensed matter physics) showed that, after controlling for the early view postulate, the remaining difference in citation counts between OA and non-OA articles is explained by the selection bias postulate. No evidence was found to support the OA postulate per se; i.e. article OA status alone has little or no effect on citations. Further studies using a similarly rigorous approach are required to determine the generality of this finding. (c) 2007 Elsevier Ltd. All rights reserved. C1 [Craig, Iain D.] Wiley Blackwell, Oxford OX4 2DQ, England. [Plume, Andrew M.; Amin, Mayur] Elsevier, Oxford OX5 1GB, England. [McVeigh, Marie E.; Pringle, James] Thomson Sci, Philadelphia, PA 19104 USA. RP Craig, ID (reprint author), Wiley Blackwell, 9600 Garsington Rd, Oxford OX4 2DQ, England. 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Informetr. PD JUL PY 2007 VL 1 IS 3 BP 239 EP 248 DI 10.1016/j.joi.2007.04.001 PG 10 WC Information Science & Library Science SC Information Science & Library Science GA 272BE UT WOS:000253831700007 ER PT J AU Schubert, A Glanzel, W AF Schubert, Andras Glanzel, Wolfgang TI A systematic analysis of Hirsch-type indices for journals SO JOURNAL OF INFORMETRICS LA English DT Article DE h-index; Pareto distribution; impact factor; journals; ranking AB A theoretical model of the dependence of Hirsch-type indices on the number of publications and the average citation rate is tested successfully on empirical samples of journal h-indices. C1 [Schubert, Andras; Glanzel, Wolfgang] Hungarian Acad Sci, ISSRU, IRPS, Budapest, Hungary. [Glanzel, Wolfgang] Katholieke Univ Leuven, B-3000 Louvain, Belgium. RP Glanzel, W (reprint author), Hungarian Acad Sci, ISSRU, IRPS, Budapest, Hungary. 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PD JUL PY 2007 VL 1 IS 3 BP 179 EP 184 DI 10.1016/j.joi.2006.12.002 PG 6 WC Information Science & Library Science SC Information Science & Library Science GA 272BE UT WOS:000253831700001 ER PT J AU Waltman, L van Eck, NJ van Leeuwen, TN Visser, MS van Raan, AFJ AF Waltman, Ludo van Eck, Nees Jan van Leeuwen, Thed N. Visser, Martijn S. van Raan, Anthony F. J. TI Towards a new crown indicator: Some theoretical considerations SO JOURNAL OF INFORMETRICS LA English DT Article DE Bibliometric indicator; Consistency; Crown indicator; Normalization ID RESEARCH PERFORMANCE; RELATIVE INDICATORS; CITATION IMPACT; CHARTS; OUTPUT; SCORE AB The crown indicator is a well-known bibliometric indicator of research performance developed by our institute. The indicator aims to normalize citation counts for differences among fields. We critically examine the theoretical basis of the normalization mechanism applied in the crown indicator. 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Informetr. PD JAN PY 2011 VL 5 IS 1 BP 37 EP 47 DI 10.1016/j.joi.2010.08.001 PG 11 WC Information Science & Library Science SC Information Science & Library Science GA 698WS UT WOS:000285626000004 ER PT J AU Bar-Ilan, J AF Bar-Ilan, Judit TI Informetrics at the beginning of the 21st century - A review SO JOURNAL OF INFORMETRICS LA English DT Review DE informetrics; bibliometrics; scientometrics; webometrics ID AUTHOR COCITATION ANALYSIS; JOURNAL-CITATION-REPORTS; UNIVERSITY WEB SITES; SCIENCE-AND-TECHNOLOGY; INDUSTRY-GOVERNMENT RELATIONS; INFORMAL SCHOLARLY COMMUNICATION; LATENT SEMANTIC ANALYSIS; SEARCH ENGINE COVERAGE; ACCESS RESEARCH PAPERS; COMBINING FULL-TEXT AB This paper reviews developments in informetrics between 2000 and 2006. At the beginning of the 21st century we witness considerable growth in webometrics, mapping and visualization and open access. A new topic is comparison between citation databases, as a result of the introduction of two new citation databases Scopus and Google Scholar. There is renewed interest in indicators as a result of the introduction of the h-index. Traditional topics like citation analysis and informetric theory also continue to develop. The impact factor debate, especially outside the informetric literature continues to thrive. Ranked lists (of journal, highly cited papers or of educational institutions) are of great public interest. (C) 2007 Elsevier Ltd. All rights reserved. C1 Bar Ilan Univ, Dept Informat Sci, IL-52900 Ramat Gan, Israel. RP Bar-Ilan, J (reprint author), Bar Ilan Univ, Dept Informat Sci, IL-52900 Ramat Gan, Israel. 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Informetr. PY 2008 VL 2 IS 1 BP 1 EP 52 DI 10.1016/j.joi.2007.11.001 PG 52 WC Information Science & Library Science SC Information Science & Library Science GA 270LL UT WOS:000253722200001 ER PT J AU Gonzalez-Pereira, B Guerrero-Bote, VP Moya-Anegon, F AF Gonzalez-Pereira, Borja Guerrero-Bote, Vicente P. Moya-Anegon, Felix TI A new approach to the metric of journals' scientific prestige: The SJR indicator SO JOURNAL OF INFORMETRICS LA English DT Article DE SJR indicator; Academic journals; Journal prestige; Eigenvector centrality; Citation networks ID IMPACT FACTOR AB A size-independent indicator of journals' scientific prestige, the SCImago Journal Rank (SJR) indicator, is proposed that ranks scholarly journals based on citation weighting schemes and eigenvector centrality. It is designed for use with complex and heterogeneous citation networks such as Scopus. Its computation method is described, and the results of its implementation on the Scopus 2007 dataset is compared with those of an ad hoc Journal Impact Factor, JIF(3y), both generally and within specific scientific areas. Both the SJR indicator and the JIF distributions were found to fit well to a logarithmic law. While the two metrics were strongly correlated, there were also major changes in rank. In addition, two general characteristics were observed. On the one hand, journals' scientific influence or prestige as computed by the SJR indicator tended to be concentrated in fewer journals than the quantity of citation measured by JIF(3y). And on the other, the distance between the top-ranked journals and the rest tended to be greater in the SJR ranking than in that of the JIF(3y), while the separation between the middle and lower ranked journals tended to be smaller. (C) 2010 Elsevier Ltd. All rights reserved. C1 [Guerrero-Bote, Vicente P.] Univ Extremadura, Dept Informat & Commun, Scimago Grp, E-06071 Badajoz, Spain. [Moya-Anegon, Felix] CSIC, CCHS, IPP, Scimago Grp, Madrid, Spain. RP Guerrero-Bote, VP (reprint author), Univ Extremadura, Dept Informat & Commun, Scimago Grp, E-06071 Badajoz, Spain. 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PD JUL PY 2010 VL 4 IS 3 BP 379 EP 391 DI 10.1016/j.joi.2010.03.002 PG 13 WC Information Science & Library Science SC Information Science & Library Science GA 607YQ UT WOS:000278543600017 ER PT J AU Opthof, T Leydesdorff, L AF Opthof, Tobias Leydesdorff, Loet TI Caveats for the journal and field normalizations in the CWTS ("Leiden") evaluations of research performance SO JOURNAL OF INFORMETRICS LA English DT Article DE Research performance; Evaluation; Citation; Normalization ID CITATION DISTRIBUTIONS; IMPACT FACTORS; INDICATORS; SCIENCE; UNIVERSALITY; CHEMISTRY; INDEX AB The Center for Science and Technology Studies at Leiden University advocates the use of specific normalizations for assessing research performance with reference to a world average. The Journal Citation Score (JCS) and Field Citation Score (FCS) are averaged for the research group or individual researcher under study, and then these values are used as denominators of the (mean) Citations per publication (CPP). Thus, this normalization is based on dividing two averages. This procedure only generates a legitimate indicator in the case of underlying normal distributions. Given the skewed distributions under study, one should average the observed versus expected values which are to be divided first for each publication. We show the effects of the Leiden normalization for a recent evaluation where we happened to have access to the underlying data. (C) 2010 Elsevier Ltd. All rights reserved. C1 [Leydesdorff, Loet] Univ Amsterdam, ASCoR, NL-1012 CX Amsterdam, Netherlands. [Opthof, Tobias] Univ Amsterdam, Acad Med Ctr, Heart Failure Res Ctr, Expt Cardiol Grp, NL-1105 AZ Amsterdam, Netherlands. [Opthof, Tobias] Univ Med Ctr Utrecht, Dept Med Physiol, Utrecht, Netherlands. RP Leydesdorff, L (reprint author), Univ Amsterdam, ASCoR, Kloveniersburgwal 48, NL-1012 CX Amsterdam, Netherlands. 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PD JUL PY 2010 VL 4 IS 3 BP 423 EP 430 DI 10.1016/j.joi.2010.02.003 PG 8 WC Information Science & Library Science SC Information Science & Library Science GA 607YQ UT WOS:000278543600021 ER PT J AU Wagner, CS Roessner, JD Bobb, K Klein, JT Boyack, KW Keyton, J Rafols, I Borner, K AF Wagner, Caroline S. Roessner, J. David Bobb, Kamau Klein, Julie Thompson Boyack, Kevin W. Keyton, Joann Rafols, Ismael Boerner, Katy TI Approaches to understanding and measuring interdisciplinary scientific research (IDR): A review of the literature SO JOURNAL OF INFORMETRICS LA English DT Review DE Interdisciplinary; Science; Research; Indicators; Bibliometrics; Evaluation ID TRANSDISCIPLINARY RESEARCH; TEAM SCIENCE; COLLABORATION; PERSPECTIVES; BETWEENNESS; INDICATORS; CENTRALITY; JOURNALS; CENTERS; FIELD AB Interdisciplinary scientific research (IDR) extends and challenges the study of science on a number of fronts, including creating output science and engineering (S&E) indicators. This literature review began with a narrow search for quantitative measures of the output of IDR that could contribute to indicators, but the authors expanded the scope of the review as it became clear that differing definitions, assessment tools, evaluation processes, and measures all shed light on different aspects of IDR. Key among these broader aspects is (a) the importance of incorporating the concept of knowledge integration, and (b) recognizing that integration can occur within a single mind as well as among a team. Existing output measures alone cannot adequately capture this process. Among the quantitative measures considered, bibliometrics (co-authorships, co-inventors, collaborations, references, citations and co-citations) are the most developed, but leave considerable gaps in understanding of the social dynamics that lead to knowledge integration. Emerging measures in network dynamics (particularly betweenness centrality and diversity), and entropy are promising as indicators, but their use requires sophisticated interpretations. Combinations of quantitative measures and qualitative assessments being applied within evaluation studies appear to reveal IDR processes but carry burdens of expense, intrusion, and lack of reproducibility year-upon-year. This review is a first step toward providing a more holistic view of measuring IDR, although research and development is needed before metrics can adequately reflect the actual phenomenon of IDR. (C) 2010 Published by Elsevier Ltd. C1 [Wagner, Caroline S.; Roessner, J. David; Bobb, Kamau] SRI Int, Arlington, VA USA. [Klein, Julie Thompson] Wayne State Univ, Detroit, MI USA. [Boyack, Kevin W.] SciTech Strategies Inc, Albuquerque, NM USA. [Keyton, Joann] N Carolina State Univ, Raleigh, NC 27695 USA. [Rafols, Ismael] Univ Sussex, Sci Policy Res Unit, Brighton, E Sussex, England. [Boerner, Katy] Indiana Univ, Bloomington, IN USA. RP Wagner, CS (reprint author), Penn State Univ, Sch Int Affairs, University Pk, PA 16802 USA. 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PD JAN PY 2011 VL 5 IS 1 BP 14 EP 26 DI 10.1016/j.joi.2010.06.004 PG 13 WC Information Science & Library Science SC Information Science & Library Science GA 698WS UT WOS:000285626000002 ER PT J AU Norris, M Oppenheim, C AF Norris, Michael Oppenheim, Charles TI Comparing alternatives to the Web of Science for coverage of the social sciences' literature SO JOURNAL OF INFORMETRICS LA English DT Article DE RAE; Web of Science; Scopus; CSA Illumina Google Scholar research impact ID GOOGLE-SCHOLAR AB The Web of Science is no longer the only database which offers citation indexing of the social sciences. Scopus, CSA Illumina and Google Scholar are new entrants in this market. The holdings and citation records of these four databases were assessed against two sets of data one drawn from the 2001 Research Assessment Exercise and the other from the International bibliography of the Social Sciences. Initially, CSA Illumina's cove-rage at journal title level appeared to be the most comprehensive. But when recall and average citation count was tested at article level and rankings extrapolated by submission frequency to individual journal titles, Scopus was ranked first. When issues of functionality, the quality of record processing and depth of coverage are taken into account, Scopus and Web of Science have a significant advantage over the other two databases. From this analysis, Scopus offers the best coverage from amongst these databases and could be used as an alternative to the Web of Science as a tool to evaluate the research impact in the social sciences. (c) 2007 Charles Oppenheim. Published by Elsevier Ltd. All rights reserved. C1 [Norris, Michael; Oppenheim, Charles] Univ Loughborough, Dept Informat Sci, Loughborough LE11 3TU, Leics, England. RP Oppenheim, C (reprint author), Univ Loughborough, Dept Informat Sci, Loughborough LE11 3TU, Leics, England. EM M.Norris2@lboro.ac.uk; C.Oppenheim@lboro.ac.uk CR ADAMS J, RES ASSESSMENT UK PU Burnham J. 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Informetr. PD APR PY 2007 VL 1 IS 2 BP 161 EP 169 DI 10.1016/j.joi.2006.12.001 PG 9 WC Information Science & Library Science SC Information Science & Library Science GA 269JI UT WOS:000253644900007 ER PT J AU Leydesdorff, L Wagner, CS AF Leydesdorff, Loet Wagner, Caroline S. TI International collaboration in science and the formation of a core group SO JOURNAL OF INFORMETRICS LA English DT Article DE Scientific collaboration; Social network analysis; Science policy; Social systems; Co-authorship ID COOCCURRENCE DATA; CENTRALITY; ORGANIZATION; BETWEENNESS; INDICATORS AB International collaboration as measured by co-authorship relations on refereed papers grew linearly from 1990 to 2005 in terms of the number of papers, but exponentially in terms of the number of international addresses. This confirms Persson et al.' s [ Persson, O., Glanzel, W., & Danell, R. (2004). Inflationary bibliometrics values: The role of scientific collaboration and the need for relative indicators in evaluative studies. Scientometrics, 60(3), 421 - 432] hypothesis of an inflation in international collaboration. Patterns in international collaboration in science can be considered as network effects, since there is no political institution mediating relationships at that level except for the initiatives of the European Commission. Science at the international level shares features with other complex adaptive systems whose order arises from the interactions of hundreds of agents pursuing self-interested strategies. During the period 2000 - 2005, the network of global collaborations appears to have reinforced the formation of a core group of fourteen most cooperative countries. This core group can be expected to use knowledge from the global network with great efficiency, since these countries have strong national systems. 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TI Hirsch's h-index: A stochastic model SO JOURNAL OF INFORMETRICS LA English DT Article DE Hirsch h-index; stochastic model; informetric process ID CITATION DISTRIBUTION; SCIENTISTS; RANKING AB We propose a simple stochastic model for an author's production/citation process in order to investigate the recently proposed h-index for measuring an author's research output and its impact. The parametric model distinguishes between an author's publication process and the subsequent citation processes of the published papers. This allows us to investigate different scenarios such as varying the production/publication rates and citation rates as well as the researcher's career length. We are able to draw tentative results regarding the dependence of Hirsch's h-index on each of these fundamental parameters. We conjecture that the h-index is, according to this model, (approximately) linear in career length, log publication rate and log citation rate, at least for moderate citation rates. 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Informetr. PD JAN PY 2007 VL 1 IS 1 BP 16 EP 25 DI 10.1016/j.joi.2006.07.001 PG 10 WC Information Science & Library Science SC Information Science & Library Science GA 274AN UT WOS:000253974300004 ER PT J AU Prabowo, R Thelwall, M AF Prabowo, Rudy Thelwall, Mike TI Sentiment analysis: A combined approach SO JOURNAL OF INFORMETRICS LA English DT Article DE Sentiment analysis; Unsupervised learning; Machine learning; Hybrid classification ID WEB AB Sentiment analysis is an important current research area. This paper combines rule-based classification, supervised learning and machine learning into a new combined method. This method is tested on movie reviews, product reviews and MySpace comments. The results show that a hybrid classification can improve the classification effectiveness in terms of micro- and macro-averaged F(1). F(1) is a measure that takes both the precision and recall of a classifier's effectiveness into account. 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Informetr. PD APR PY 2009 VL 3 IS 2 BP 143 EP 157 DI 10.1016/j.joi.2009.01.003 PG 15 WC Information Science & Library Science SC Information Science & Library Science GA 420VM UT WOS:000264317300005 ER PT J AU Bornmann, L Mutz, R Hug, SE Daniel, HD AF Bornmann, Lutz Mutz, Ruediger Hug, Sven E. Daniel, Hans-Dieter TI A multilevel meta-analysis of studies reporting correlations between the h index and 37 different h index variants SO JOURNAL OF INFORMETRICS LA English DT Article DE h index; h index variants; Meta-analysis; Multilevel analysis ID HIRSCH-TYPE INDEXES; SCIENTIFIC-RESEARCH OUTPUT; SELF-CITATION CORRECTIONS; RANDOM-EFFECTS MODELS; BIBLIOMETRIC INDICATORS; AUTHORED MANUSCRIPTS; RESEARCH PERFORMANCE; R-INDEX; IMPACT; INSTITUTIONS AB This paper presents the first meta-analysis of studies that computed correlations between the h index and variants of the h index (such as the g index; in total 37 different variants) that have been proposed and discussed in the literature. A high correlation between the h index and its variants would indicate that the h index variants hardly provide added information to the h index. This meta-analysis included 135 correlation coefficients from 32 studies. The studies were based on a total sample size of N = 9005; on average, each study had a sample size of n = 257. The results of a three-level cross-classified mixed-effects meta-analysis show a high correlation between the h index and its variants: Depending on the model, the mean correlation coefficient varies between 8 and 9. This means that there is redundancy between most of the h index variants and the h index. There is a statistically significant study-to-study variation of the correlation coefficients in the information they yield. The lowest correlation coefficients with the h index are found for the h index variants MII and m index. Hence, these h index variants make a non-redundant contribution to the h index. (C) 2011 Elsevier Ltd. All rights reserved. C1 [Bornmann, Lutz] Max Planck Soc, D-80539 Munich, Germany. [Mutz, Ruediger; Hug, Sven E.; Daniel, Hans-Dieter] ETH, CH-8092 Zurich, Switzerland. [Daniel, Hans-Dieter] Univ Zurich, Evaluat Off, CH-8001 Zurich, Switzerland. RP Bornmann, L (reprint author), Max Planck Soc, Hofgartenstr 8, D-80539 Munich, Germany. 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Informetr. PD OCT PY 2010 VL 4 IS 4 BP 629 EP 635 DI 10.1016/j.joi.2010.07.002 PG 7 WC Information Science & Library Science SC Information Science & Library Science GA 647KA UT WOS:000281616200017 ER PT J AU Burrell, QL AF Burrell, Quentin L. TI On the h-index, the size of the Hirsch core and Jin's A-index SO JOURNAL OF INFORMETRICS LA English DT Article DE Hirsch h-index; Hirsch h-core; Jin A-index; stochastic model; informetric process AB Hirsch's h-index seeks to give a single number that in some sense summarizes an author's research output and its impact. Essentially, the h-index seeks to identify the most productive core of an author's output in terms of most received citations. This most productive set we refer to as the Hirsch core, or h-core. Jin's A-index relates to the average impact, as measured by the average number of citations, of this "most productive" core. In this paper, we investigate both the total productivity of the Hirsch core - what we term the size of the h-core - and the A-index using a previously proposed stochastic model for the publication/citation process, emphasising the importance of the dynamic, or time-dependent, nature of these measures. We also look at the inter-relationships between these measures. Numerical investigations suggest that the A-index is a linear function of time and of the h-index, while the size of the Hirsch core has an approximate square-law relationship with time, and hence also with the A-index and the h-index. (c) 2007 Elsevier Ltd. All rights reserved. C1 Isle Man Int Business Sch, Douglas IM2 1QB, Isle Man, England. RP Burrell, QL (reprint author), Isle Man Int Business Sch, Old Castletown Rd, Douglas IM2 1QB, Isle Man, England. 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PD APR PY 2007 VL 1 IS 2 BP 170 EP 177 DI 10.1016/j.joi.2007.01.003 PG 8 WC Information Science & Library Science SC Information Science & Library Science GA 269JI UT WOS:000253644900008 ER PT J AU van Raan, AFJ van Leeuwen, TN Visser, MS van Eck, NJ Waltman, L AF van Raan, Anthony F. J. van Leeuwen, Thed N. Visser, Martijn S. van Eck, Nees Jan Waltman, Ludo TI Rivals for the crown: Reply to Opthof and Leydesdorff SO JOURNAL OF INFORMETRICS LA English DT Article DE Bibliometric indicator; Crown indicator; Field normalization; Research performance assessment ID RESEARCH PERFORMANCE; CITATION; INDICATORS; IMPACT AB We reply to the criticism of Opthof and Leydesdorff on the way in which our institute applies journal and field normalizations to citation counts. We point out why we believe most of the criticism is unjustified, but we also indicate where we think Opthof and Leydesdorff raise a valid point. (C) 2010 Elsevier Ltd. All rights reserved. C1 [van Raan, Anthony F. J.; van Leeuwen, Thed N.; Visser, Martijn S.; van Eck, Nees Jan; Waltman, Ludo] Leiden Univ, Ctr Sci & Technol Studies, NL-2300 RA Leiden, Netherlands. RP van Raan, AFJ (reprint author), Leiden Univ, Ctr Sci & Technol Studies, NL-2300 RA Leiden, Netherlands. EM vanraan@cwts.leidenuniv.nl; leeuwen@cwts.leidenuniv.nl; visser@cwts.leidenuniv.nl; ecknjpvan@cwts.leidenuniv.nl; waltmanlr@cwts.leidenuniv.nl RI visser, martijn/A-6186-2011; van Eck, Nees Jan/B-6042-2008 OI van Eck, Nees Jan/0000-0001-8448-4521 CR Adams J, 2008, SCIENTOMETRICS, V75, P81, DOI 10.1007/s11192-007-1832-7 *AMC, 2008, AMC SPEC CWTS UNPUB Boyack KW, 2005, SCIENTOMETRICS, V64, P351, DOI 10.1007/s11192-005-0255-6 Efron B., 1993, INTRO BOOTSTRAP Glanzel W, 2009, SCIENTOMETRICS, V78, P165, DOI 10.1007/s11192-008-2109-5 Kronman U., 2008, BIBLIOMETRIC HDB KAR, V1.05 Lundberg J, 2007, J INFORMETR, V1, P145, DOI 10.1016/j.joi.2006.09.007 MOED HF, 1995, SCIENTOMETRICS, V33, P381, DOI 10.1007/BF02017338 MOED HF, J INFORMETR IN PRESS OPTHOF T, J INFORMETR IN PRESS SCHUBERT A, 1983, SCIENTOMETRICS, V5, P59, DOI 10.1007/BF02097178 *SCIMAGO RES GROUP, 2009, SCIMAGO I RANK SIR 2 Spiegelhalter DJ, 2009, STAT SCI, V24, P21 Van Raan A.F.J., 2005, HDB QUANTITATIVE SCI, P19 VANLEEUWEN TN, 2009, P 12 INT C SCIENT IN, P410 WALTMAN L, 2010, ARXIV10032167V1 Zitt M, 2008, J AM SOC INF SCI TEC, V59, P1856, DOI 10.1002/asi.20880 Zitt M, 2005, SCIENTOMETRICS, V63, P373, DOI 10.1007/s11192-005-0218-y NR 18 TC 48 Z9 49 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 1751-1577 J9 J INFORMETR JI J. Informetr. PD JUL PY 2010 VL 4 IS 3 BP 431 EP 435 DI 10.1016/j.joi.2010.03.008 PG 5 WC Information Science & Library Science SC Information Science & Library Science GA 607YQ UT WOS:000278543600022 ER PT J AU Chen, CM Chen, Y Horowitz, M Hou, HY Liu, ZY Pellegrino, D AF Chen, Chaomei Chen, Yue Horowitz, Mark Hou, Haiyan Liu, Zeyuan Pellegrino, Donald TI Towards an explanatory and computational theory of scientific discovery SO JOURNAL OF INFORMETRICS LA English DT Article DE Theory of scientific discovery; Transformative scientific discoveries; Theory of structural holes; Intellectual brokerage; Knowledge diffusion; Information foraging ID UNDISCOVERED PUBLIC KNOWLEDGE; IMPACT RESEARCH AUTHORS; BETWEENNESS CENTRALITY; MATHEMATICAL APPROACH; CITATION PERSPECTIVE; SOCIAL NETWORK; NOBEL CLASS; FISH-OIL; EVOLUTION; SCIENCE AB We propose an explanatory and computational theory of transformative discoveries in science. The theory is derived from a recurring theme found in a diverse range of scientific change, scientific discovery, and knowledge diffusion theories in philosophy of science, sociology of science, social network analysis, and information science. The theory extends the concept of structural holes from social networks to a broader range of associative networks found in science studies, especially including networks that reflect underlying intellectual structures such as co-citation networks and collaboration networks. The central premise is that connecting otherwise disparate patches of knowledge is a valuable mechanism of creative thinking in general and transformative scientific discovery in particular. In addition, the premise consistently explains the value of connecting people from different disciplinary specialties. The theory not only explains the nature of transformative discoveries in terms of the brokerage mechanism but also characterizes the subsequent diffusion process as optimal information foraging in a problem space. Complementary to epidemiological models of diffusion, foraging-based conceptualizations offer a unified framework for arriving at insightful discoveries and optimizing subsequent pathways of search in a problem space. Structural and temporal properties of potentially high-impact scientific discoveries are derived from the theory to characterize the emergence and evolution of intellectual networks of a field. Two Nobel Prize winning discoveries, the discovery of Helicobacter pylori and gene targeting techniques, and a discovery in string theory demonstrated such properties. Connections to and differences from existing approaches are discussed. The primary value of the theory is that it provides not only a computational model of intellectual growth, but also concrete and constructive explanations of where one may find insightful inspirations for transformative scientific discoveries. (C) 2009 Elsevier Ltd. All rights reserved. C1 [Chen, Chaomei; Horowitz, Mark; Pellegrino, Donald] Drexel Univ, Coll Informat Sci & Technol, Philadelphia, PA 19104 USA. [Chen, Chaomei; Chen, Yue; Hou, Haiyan; Liu, Zeyuan] Dalian Univ Technol, WISE Lab, Dalian, Peoples R China. RP Chen, CM (reprint author), Drexel Univ, Coll Informat Sci & Technol, Philadelphia, PA 19104 USA. 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PD JUL PY 2009 VL 3 IS 3 BP 191 EP 209 DI 10.1016/j.joi.2009.03.004 PG 19 WC Information Science & Library Science SC Information Science & Library Science GA 459WT UT WOS:000267144200004 ER PT J AU Schreiber, M AF Schreiber, Michael TI A modification of the h-index: The h(m)-index accounts for multi-authored manuscripts SO JOURNAL OF INFORMETRICS LA English DT Article DE Hirsch index; performance evaluation; citations; ranking; impact; co-authorship ID SCIENTIFIC-RESEARCH AB In order to take multiple co-authorship appropriately into account, a straightforward modi. cation of the Hirsch index was recently proposed. Fractionalised counting of the papers yields an appropriate measure which is called the h(m)-index. The effect of this procedure is compared in the present work with other variants of the h-index and found to be superior to the fractionalised counting of citations and to the normalization of the h-index with the average number of authors in the h-core. Three fictitious examples for model cases and one empirical case are analysed. (C) 2008 Elsevier Ltd. All rights reserved. C1 Tech Univ Chemnitz, Inst Phys, D-09107 Chemnitz, Germany. RP Schreiber, M (reprint author), Tech Univ Chemnitz, Inst Phys, D-09107 Chemnitz, Germany. EM schreiber@physik.tu-chemnitz.de CR Batista PD, 2006, SCIENTOMETRICS, V68, P179, DOI 10.1007/s11192-006-0090-4 Bornmann L, 2007, J AM SOC INF SCI TEC, V58, P1381, DOI 10.1002/asi.20609 BURRELL QL, 2007, MULTIDIMENSIONAL WOR, P65 Egghe L, 2000, J AM SOC INFORM SCI, V51, P145, DOI 10.1002/(SICI)1097-4571(2000)51:2<145::AID-ASI6>3.0.CO;2-9 EGGHE L, 2008, J AM SOC IN IN PRESS, V59 Egghe L., 2006, ISSI NEWSLETTER, V2, P8 Hirsch JE, 2007, P NATL ACAD SCI USA, V104, P19193, DOI 10.1073/pnas.0707962104 Hirsch JE, 2005, P NATL ACAD SCI USA, V102, P16569, DOI 10.1073/pnas.0507655102 Imperial J, 2007, SCIENTOMETRICS, V71, P271, DOI 10.1007/s11192-007-1665-4 Jin BH, 2007, CHINESE SCI BULL, V52, P855, DOI 10.1007/s11434-007-0145-9 Schreiber M., 2007, EPL-EUROPHYS LETT, V7, P30002, DOI DOI 10.1209/0295-5075/78/30002 SCHREIBER M, 2008, NEW J PHYS, V10 Schreiber M, 2008, SCIENTOMETRICS, V76, P187, DOI 10.1007/s11192-007-1886-6 Schreiber M, 2007, ANN PHYS-BERLIN, V16, P640, DOI 10.1002/andp.200710252 Wan J., 2007, COLLNET J SCIENTOMET, V1, P1 NR 15 TC 47 Z9 47 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 1751-1577 J9 J INFORMETR JI J. Informetr. PD JUL PY 2008 VL 2 IS 3 BP 211 EP 216 DI 10.1016/j.joi.2008.05.001 PG 6 WC Information Science & Library Science SC Information Science & Library Science GA 327ZQ UT WOS:000257767400005 ER PT J AU van Eck, NJ Waltman, L AF van Eck, Nees Jan Waltman, Ludo TI Generalizing the h- and g- indices SO JOURNAL OF INFORMETRICS LA English DT Article DE h-Index; Hirsch index; h(alpha)-Index; g-Index; g(alpha)-Index ID HIRSCH-INDEX; BIBLIOMETRIC INDICATORS; SCIENTISTS; RANKING; OUTPUT AB We introduce two new measures of the performance of a scientist. One measure, referred to as the h(alpha)-index, generalizes the well-known h-index or Hirsch index. The other measure, referred to as the g(alpha)-index, generalizes the closely related g-index. We analyze theoretically the relationship between the h(alpha)-and g(alpha)-indices on the one hand and some simple measures of scientific performance on the other hand. We also study the behavior of the h(alpha)-and g(alpha)-indices empirically. Some advantages of the h(alpha)- and g(alpha)-indices over the h- and g-indices are pointed out. (C) 2008 Elsevier Ltd. All rights reserved. C1 [van Eck, Nees Jan; Waltman, Ludo] Erasmus Univ, Erasmus Sch Econ, Inst Econometr, NL-3000 DR Rotterdam, Netherlands. RP van Eck, NJ (reprint author), Erasmus Univ, Erasmus Sch Econ, Inst Econometr, POB 1738, NL-3000 DR Rotterdam, Netherlands. EM nvaneck@few.eur.nl; lwaltman@few.eur.nl RI Waltman, Ludo/B-5561-2008; van Eck, Nees Jan/B-6042-2008 OI van Eck, Nees Jan/0000-0001-8448-4521 CR Anderson TR, 2008, SCIENTOMETRICS, V76, P577, DOI 10.1007/s11192-007-2071-2 Ball P, 2005, NATURE, V436, P900, DOI 10.1038/436900a Bar-Ilan J., 2006, ISSI NEWSLETTER, V2, P3 BARILAN J, 2008, SCIENTOMETRICS, V76, P577 Batista PD, 2006, SCIENTOMETRICS, V68, P179, DOI 10.1007/s11192-006-0090-4 Bornmann L, 2008, J AM SOC INF SCI TEC, V59, P830, DOI 10.1002/asi.20806 Bornmann L, 2005, SCIENTOMETRICS, V65, P391, DOI 10.1007/s11192-005-0281-4 Bornmann L, 2007, J AM SOC INF SCI TEC, V58, P1381, DOI 10.1002/asi.20609 Costas R, 2007, J INFORMETR, V1, P193, DOI 10.1016/j.joi.2007.02.001 COSTAS R, SCIENTOMETR IN PRESS Egghe L, 2006, SCIENTOMETRICS, V69, P131, DOI 10.1007/s11192-006-0144-7 Egghe L., 2006, ISSI NEWSLETTER, V2, P8 Egghe L, 2008, INFORM PROCESS MANAG, V44, P770, DOI 10.1016/j.ipm.2007.05.003 Egghe L, 2006, SCIENTOMETRICS, V69, P121, DOI 10.1007/s11192-006-0143-8 Glanzel W., 2005, ISSI NEWSLETTER, V1, P15 Hirsch JE, 2007, P NATL ACAD SCI USA, V104, P19193, DOI 10.1073/pnas.0707962104 Hirsch JE, 2005, P NATL ACAD SCI USA, V102, P16569, DOI 10.1073/pnas.0507655102 Iglesias JE, 2007, SCIENTOMETRICS, V73, P303, DOI 10.1007/s11192-007-1805-x Jin B., 2007, ISSI NEWSLETTER, V3, P6 Jin BH, 2007, CHINESE SCI BULL, V52, P855, DOI 10.1007/s11434-007-0145-9 Kosmulski M., 2006, ISSI NEWSLETTER, V2, P4 Lehmann S, 2006, NATURE, V444, P1003, DOI 10.1038/4441003a Lehmann S, 2008, SCIENTOMETRICS, V76, P369, DOI 10.1007/s11192-007-1868-8 PINSKI G, 1976, INFORM PROCESS MANAG, V12, P297, DOI 10.1016/0306-4573(76)90048-0 ROUSSEAU R, 2008, SCIENTOMETRICS, V75, P395 Schreiber M, 2008, J INFORMETR, V2, P211, DOI 10.1016/j.joi.2008.05.001 Sidiropoulos A, 2007, SCIENTOMETRICS, V72, P253, DOI 10.1007/s11192-007-1722-z Tol RSJ, 2008, J INFORMETR, V2, P149, DOI 10.1016/j.joi.2008.01.001 Van Raan AFJ, 2006, SCIENTOMETRICS, V67, P491, DOI 10.1556/Scient.67.2006.3.10 Vinkler P, 2007, J INF SCI, V33, P481, DOI 10.1177/0165551506072165 Woeginger GJ, 2008, MATH SOC SCI, V56, P224, DOI 10.1016/j.mathsocsci.2008.03.001 Woeginger GJ, 2008, J INFORMETR, V2, P364, DOI 10.1016/j.joi.2008.05.002 WU Q, 2008, ARXIV08054650V3 NR 33 TC 46 Z9 46 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 1751-1577 J9 J INFORMETR JI J. Informetr. PD OCT PY 2008 VL 2 IS 4 BP 263 EP 271 DI 10.1016/j.joi.2008.09.004 PG 9 WC Information Science & Library Science SC Information Science & Library Science GA 372LS UT WOS:000260903700001 ER PT J AU Bornmann, L Marx, W Schier, H Rahm, E Thor, A Daniel, HD AF Bornmann, Lutz Marx, Werner Schier, Hermann Rahm, Erhard Thor, Andreas Daniel, Hans-Dieter TI Convergent validity of bibliometric Google Scholar data in the field of chemistry-Citation counts for papers that were accepted by Angewandte Chemie International Edition or rejected but published elsewhere, using Google Scholar, Science Citation Index, Scopus, and Chemical Abstracts SO JOURNAL OF INFORMETRICS LA English DT Article DE Web of Science; Science Citation Index; Scopus; Chemical Abstracts; Google Scholar; Citation analysis ID WEB-OF-SCIENCE; H-INDEX; IMPACT; PRODUCTIVITY; PUBLICATIONS; DATABASES; LIS AB Examining a comprehensive set of papers (n = 1837) that were accepted for publication by the journal Angewandte Chemie International Edition (one of the prime chemistry journals in the world) or rejected by the journal but then published elsewhere, this study tested the extent to which the use of the freely available database Google Scholar (GS) can be expected to yield valid citation counts in the field of chemistry. Analyses of citations for the set of papers returned by three fee-based databases - Science Citation Index, Scopus, and Chemical Abstracts - were compared to the analysis of citations found using GS data. Whereas the analyses using citations returned by the three fee-based databases show very similar results, the results of the analysis using GS citation data differed greatly from the findings using citations from the fee-based databases. Our study therefore supports, on the one hand, the convergent validity of citation analyses based on data from the fee-based databases and, on the other hand, the lack of convergent validity of the citation analysis based on the GS data. (C) 2008 Elsevier Ltd. All rights reserved. C1 [Bornmann, Lutz; Daniel, Hans-Dieter] Swiss Fed Inst Technol, CH-8092 Zurich, Switzerland. [Marx, Werner; Schier, Hermann] Max Planck Inst Solid State Res, D-70569 Stuttgart, Germany. [Rahm, Erhard; Thor, Andreas] Univ Leipzig, Dept Comp Sci, D-04009 Leipzig, Germany. [Daniel, Hans-Dieter] Univ Zurich, Evaluat Off, CH-8001 Zurich, Switzerland. RP Bornmann, L (reprint author), Swiss Fed Inst Technol, Zahringerstr 24, CH-8092 Zurich, Switzerland. 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Lariviere, Vincent Gingras, Yves TI Modeling a century of citation distributions SO JOURNAL OF INFORMETRICS LA English DT Article DE Citations; Bibliometrics; Citation distributions; Uncitedness; History of science ID SCIENTIFIC PAPERS; POWER LAWS; UNCITEDNESS; RELAXATION; STATISTICS; INDICATORS; JOURNALS; SCIENCE; GROWTH; TAILS AB The prevalence of uncited papers or of highly cited papers, with respect to the bulk of publications, provides important clues as to the dynamics of scientific research. Using 25 million papers and 600 million references from the Web of Science over the 1900-2006 period, this paper proposes a simple model based on a random selection process to explain the "uncitedness" phenomenon and its decline over the years. We show that the proportion of cited papers is a function of (1) the number of articles available (the competing papers), (2) the number of citing papers and (3) the number of references they contain. 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The latter index combines the statistics of both citation distributions of journals (vector-based) and distances in citation networks among journals (matrix-based). The effects of various normalizations are specified and measured using the matrix of 8207 journals contained in the Journal Citation Reports of the (Social) Science Citation Index 2008. Betweenness centrality in symmetrical (1-mode) cosine-normalized networks provides an indicator outperforming betweenness in the asymmetrical (2-mode) citation network. Among the vector-based indicators, Shannon entropy performs better than the Gini coefficient, but is sensitive to size. Science and Nature, for example, are indicated at the top of the list. The new diversity measure provides reasonable results when (1 - cosine) is assumed as a measure for the distance, but results using Euclidean distances were difficult to interpret. (C) 2010 Elsevier Ltd. All rights reserved. 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PD JAN PY 2007 VL 1 IS 1 BP 92 EP 102 DI 10.1016/j.joi.2006.10.001 PG 11 WC Information Science & Library Science SC Information Science & Library Science GA 274AN UT WOS:000253974300011 ER PT J AU Abbasi, A Altmann, J Hossain, L AF Abbasi, Alireza Altmann, Joern Hossain, Liaquat TI Identifying the effects of co-authorship networks on the performance of scholars: A correlation and regression analysis of performance measures and social network analysis measures SO JOURNAL OF INFORMETRICS LA English DT Article DE Collaboration; Citation-based research performance; g-index; Co-authorship networks; Social network analysis measures; Regression; Correlation ID INTERNATIONAL SCIENTIFIC COLLABORATION; SUCCESSIVE H-INDEXES; WEAK TIES; SELF-ORGANIZATION; CENTRALITY; PRODUCTIVITY; KNOWLEDGE; RESEARCHERS; ECONOMICS; PATTERNS AB In this study, we develop a theoretical model based on social network theories and analytical methods for exploring collaboration (co-authorship) networks of scholars. We use measures from social network analysis (SNA) (i.e., normalized degree centrality, normalized closeness centrality, normalized betweenness centrality, normalized eigenvector centrality, average ties strength, and efficiency) for examining the effect of social networks on the (citation-based) performance of scholars in a given discipline (i.e., information systems). Results from our statistical analysis using a Poisson regression model suggest that research performance of scholars (g-index) is positively correlated with four SNA measures except for the normalized betweenness centrality and the normalized closeness centrality measures. Furthermore, it reveals that only normalized degree centrality, efficiency, and average ties strength have a positive significant influence on the g-index (as a performance measure). The normalized eigenvector centrality has a negative significant influence on the g-index. Based on these results, we can imply that scholars, who are connected to many distinct scholars, have a better citation-based performance (g-index) than scholars with fewer connections. Additionally, scholars with large average ties strengths (i.e., repeated co-authorships) show a better research performance than those with low tie strengths (e.g., single co-authorships with many different scholars). The results related to efficiency show that scholars, who maintain a strong co-authorship relationship to only one co-author of a group of linked co-authors, perform better than those researchers with many relationships to the same group of linked co-authors. The negative effect of the normalized eigenvector suggests that scholars should work with many students instead of other well-performing scholars. Consequently, we can state that the professional social network of researchers can be used to predict the future performance of researchers. (C) 2011 Elsevier Ltd. All rights reserved. C1 [Altmann, Joern] Seoul Natl Univ, Technol Management Econ & Policy Program, Seoul 151744, South Korea. [Abbasi, Alireza; Hossain, Liaquat] Univ Sydney, Ctr Complex Syst Res, Fac Engn & IT, Sydney, NSW 2006, Australia. [Altmann, Joern] Seoul Natl Univ, Dept Ind Engn, Coll Engn, Seoul 151744, South Korea. RP Altmann, J (reprint author), Seoul Natl Univ, Technol Management Econ & Policy Program, Seoul 151744, South Korea. EM jorn.altmann@acm.org RI Wencong, LI/N-6423-2013 CR Abbasi A, 2010, SCIENTOMETRICS, V83, P1, DOI 10.1007/s11192-009-0139-2 ABBASI A, 2011, HAW INT C SYST SCI P ABBASI A, 2010, S COLL INT COLLIN 20 Altmann J, 2009, INT J COMPUTER SCI A, V6, P104 Batista PD, 2006, SCIENTOMETRICS, V68, P179, DOI 10.1007/s11192-006-0090-4 Bavelas A., 1950, Journal of the Acoustical Society of America, V22, DOI 10.1121/1.1906679 Bavelas A., 1948, HUM ORGAN, V7, P16 BINDER JJ, 1985, J ACCOUNTING RES, V23, P370, DOI 10.2307/2490925 BONACICH P, 1972, J MATH SOCIOL, V2, P113 Borgatti S. 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Informetr. PD OCT PY 2011 VL 5 IS 4 BP 594 EP 607 DI 10.1016/j.joi.2011.05.007 PG 14 WC Information Science & Library Science SC Information Science & Library Science GA 841PI UT WOS:000296524200011 ER PT J AU Bar-Ilan, J Levene, M Lin, A AF Bar-Ilan, Judit Levene, Mark Lin, Ayelet TI Some measures for comparing citation databases SO JOURNAL OF INFORMETRICS LA English DT Article DE similarity measures; rankings; citation databases ID GOOGLE-SCHOLAR; SCIENCE; SEARCH; WEB AB Citation analysis was traditionally based on data from the ISI Citation indexes. Now with the appearance of Scopus, and with the free citation tool Google Scholar methods and measures are need for comparing these tools. In this paper we propose a set of measures for computing the similarity between rankings induced by ordering the retrieved publications in decreasing order of the number of citations as reported by the specific tools. The applicability of these measures is demonstrated and the results show high similarities between the rankings of the ISI Web of Science and Scopus and lower similarities between Google Scholar and the other tools. (c) 2006 Elsevier Ltd. All rights reserved. C1 [Bar-Ilan, Judit; Lin, Ayelet] Bar Ilan Univ, Dept Informat Sci, IL-52900 Ramat Gan, Israel. [Levene, Mark] Birkbeck Univ London, Sch Comp Sci & Informat Syst, London WC1E 7HX, England. RP Bar-Ilan, J (reprint author), Bar Ilan Univ, Dept Informat Sci, IL-52900 Ramat Gan, Israel. EM barilaj@mail.biu.ac.il; M.Levene@dcs.bbk.ac.uk; lineyal@netvision.net.il RI Bar-Ilan, Judit/B-3452-2009 OI Bar-Ilan, Judit/0000-0002-8796-5248 CR BARILAN J, 2006, J DOCUMENTATION, V62 Bar-Ilan J., 2006, ISSI NEWSLETTER, V2, P3 Bar-Ilan J, 2006, COMPUT NETW, V50, P1448, DOI 10.1016/j.comnet.2005.10.020 BARILAN J, USER RANKINGS UNPUB BAUER K, 2005, D LIB MAGAZINED, V11 Deis L., 2005, CHARLESTON ADVISOR, V6, P5 DIACONIS P, 1977, J ROY STAT SOC B MET, V39, P262 Dwork C., 2001, P 10 INT C WORLD WID, P613, DOI DOI 10.1145/371920.372165 Fagin R, 2003, SIAM J DISCRETE MATH, V17, P134, DOI 10.1137/S0895480102412856 Goodrum AA, 2001, INFORM PROCESS MANAG, V37, P661, DOI 10.1016/S0306-4573(00)00047-9 Grimm L. 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PD JAN PY 2007 VL 1 IS 1 BP 26 EP 34 DI 10.1016/j.joi.2006.08.001 PG 9 WC Information Science & Library Science SC Information Science & Library Science GA 274AN UT WOS:000253974300005 ER PT J AU Zitt, M AF Zitt, Michel TI Citing-side normalization of journal impact: A robust variant of the Audience Factor SO JOURNAL OF INFORMETRICS LA English DT Article DE Audience factor; Impact factor; Normalized impact; Citing-side normalization; Source normalization; Journal impact ID SCIENTIFIC JOURNALS; CITATION ANALYSIS; PERFORMANCE; FIELDS; INDICATORS; ADVANTAGES; NETWORKS; TOOL AB The principle of a new type of impact measure was introduced recently, called the "Audience Factor" (AF). It is a variant of the journal impact factor where emitted citations are weighted inversely to the propensity to cite of the source. In the initial design, propensity was calculated using the average length of bibliography at the source level with two options: a journal-level average or a field-level average. This citing-side normalization controls for propensity to cite, the main determinant of impact factor variability across fields. The AF maintains the variability due to exports-imports of citations across field and to growth differences. It does not account for influence chains, powerful approaches taken in the wake of Pinski-Narin's influence weights. Here we introduce a robust variant of the audience factor, trying to combine the respective advantages of the two options for calculating bibliography lengths: the classification-free scheme when the bibliography length is calculated at the individual journal level, and the robustness and avoidance of ad hoc settings when the bibliography length is averaged at the field level. The variant proposed relies on the relative neighborhood of a citing journal, regarded as its micro-field and assumed to reflect the citation behavior in this area of science. The methodology adopted allows a large range of variation of the neighborhood, reflecting the local citation network, and partly alleviates the "cross-scale" normalization issue. Citing-side normalization is a general principle which may be extended to other citation counts. (C) 2010 Elsevier Ltd. All rights reserved. C1 [Zitt, Michel] INRA Lereco, F-44316 Nantes 03, France. [Zitt, Michel] OST, Paris, France. RP Zitt, M (reprint author), INRA Lereco, Rue Geraudiere,BP 71627, F-44316 Nantes 03, France. EM zitt@nantes.inra.fr CR Adams J, 2008, SCIENTOMETRICS, V75, P81, DOI 10.1007/s11192-007-1832-7 Bar-Ilan J., 2009, CYBERMETRICS, V13, P4 Bassecoulard E, 1999, SCIENTOMETRICS, V44, P323, DOI 10.1007/BF02458483 BERGSTROM CT, 2007, COLL RES LIB NE 0505, V68 Biglu MH, 2008, SCIENTOMETRICS, V74, P453, DOI 10.1007/s11192-007-1815-8 Bollen J, 2006, SCIENTOMETRICS, V69, P669, DOI 10.1007/s11192-006-0176-z Bordons M, 2002, SCIENTOMETRICS, V53, P195, DOI 10.1023/A:1014800407876 Cozzens S. 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Given the importance that counting citations has today, the aim of the work presented here is to show how citations are distributed within a scientific area and determine the dependence of the citation count on the article features. All articles referenced in the Web of Science in 2004 for Biology & Biochemistry, Chemistry, Mathematics and Physics were considered. We show that the distribution of citations is well represented by a double exponential-Poisson law. There is a dependence of the mean citation rate on the number of co-authors, the number of addresses and the number of references, although this dependence is a little far from the linear behaviour. For the relation between the mean impact and the number of pages the dependence obtained was very low. For Biology & Biochemistry and Chemistry we found a linear behaviour between the mean citation per article and impact factor and for Mathematics and Physics the results obtained are near to the linear behaviour. 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Informetr. PD JAN PY 2010 VL 4 IS 1 BP 1 EP 13 DI 10.1016/j.joi.2009.06.002 PG 13 WC Information Science & Library Science SC Information Science & Library Science GA 530ZI UT WOS:000272631100001 ER PT J AU Leydesdorff, L Wagner, C AF Leydesdorff, Loet Wagner, Caroline TI Macro-level indicators of the relations between research funding and research output SO JOURNAL OF INFORMETRICS LA English DT Article DE R&D expenditure; Output indicator; Efficiency; Nation; S&T policies ID INNOVATION SYSTEMS; UNITED-STATES; UNIVERSITY-RESEARCH; ACADEMIC RESEARCH; TECHNICAL CHANGE; SCIENCE; KNOWLEDGE; TECHNOLOGY; GROWTH; WORLD AB In response to the call for a science of science policy, we discuss the contribution of indicators at the macro-level of nations from a scientometric perspective. In addition to global trends such as the rise of China, one can relate percentages of world share of publications to government expenditure in academic research. The marginal costs of improving one's share are increasing over time. Countries differ considerably in terms of the efficiency of turning ( financial) input into bibliometrically measurable output. Both funding schemes and disciplinary portfolios differ among countries. A price per paper can nevertheless be estimated. The percentages of GDP spent on academic research in different nations are significantly correlated to historical contingencies such as the percentage of researchers in the population. The institutional dynamics make strategic objectives such as the Lisbon objective of the EU - that is, spending 3% of GDP for R&D in 2010 - unrealistic. (C) 2009 Elsevier Ltd. All rights reserved. C1 [Leydesdorff, Loet] Univ Amsterdam, Amsterdam Sch Commun Res ASCoR, NL-1012 CX Amsterdam, Netherlands. [Wagner, Caroline] SRI Int, Arlington, VA 22209 USA. [Wagner, Caroline] George Washington Univ, Washington, DC USA. 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PD JUL PY 2007 VL 1 IS 3 BP 226 EP 238 DI 10.1016/j.joi.2007.03.001 PG 13 WC Information Science & Library Science SC Information Science & Library Science GA 272BE UT WOS:000253831700006 ER PT J AU Radicchi, F Castellano, C AF Radicchi, Filippo Castellano, Claudio TI Testing the fairness of citation indicators for comparison across scientific domains: The case of fractional citation counts SO JOURNAL OF INFORMETRICS LA English DT Article DE Citation analysis; Cross-disciplinary comparisons; Normalized citation indicators ID JOURNAL IMPACT FACTOR; SCIENTOMETRIC INDICATORS; RELATIVE INDICATORS; NORMALIZATION; SCIENCE; INDEX; DISTRIBUTIONS; UNIVERSALITY; DISCIPLINES; PERFORMANCE AB Citation numbers are extensively used for assessing the quality of scientific research. The use of raw citation counts is generally misleading, especially when applied to cross-disciplinary comparisons, since the average number of citations received is strongly dependent on the scientific discipline of reference of the paper. Measuring and eliminating biases in citation patterns is crucial for a fair use of citation numbers. Several numerical indicators have been introduced with this aim, but so far a specific statistical test for estimating the fairness of these numerical indicators has not been developed. Here we present a statistical method aimed at estimating the effectiveness of numerical indicators in the suppression of citation biases. The method is simple to implement and can be easily generalized to various scenarios. As a practical example we test, in a controlled case, the fairness of fractional citation count, which has been recently proposed as a tool for cross-discipline comparison. 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PD JAN PY 2012 VL 6 IS 1 BP 121 EP 130 DI 10.1016/j.joi.2011.09.002 PG 10 WC Information Science & Library Science SC Information Science & Library Science GA 865QL UT WOS:000298325300015 ER PT J AU Bornmann, L Leydesdorff, L Van den Besselaar, P AF Bornmann, Lutz Leydesdorff, Loet Van den Besselaar, Peter TI A meta-evaluation of scientific research proposals: Different ways of comparing rejected to awarded applications SO JOURNAL OF INFORMETRICS LA English DT Article DE Grant allocation; Peer review; Bibliometric quality indicators; Convergent validity and predictive validity; Error; Citation rate; h-Index ID H-INDEX; PERFORMANCE; SCIENCE; BIOMEDICINE; INDICATORS; ERRORS AB Combining different data sets with information on grant and fellowship applications submitted to two renowned funding agencies, we are able to compare their funding decisions (award and rejection) with scientometric performance indicators across two fields of science (life sciences and social sciences). The data sets involve 671 applications in social sciences and 668 applications in life sciences. In both fields, awarded applicants perform on average better than all rejected applicants. If only the most preeminent rejected applicants are considered in both fields, they score better than the awardees on citation impact. With regard to productivity we find differences between the fields. While the awardees in life sciences outperform on average the most preeminent rejected applicants, the situation is reversed in social sciences. (C) 2009 Elsevier Ltd. All rights reserved. C1 [Bornmann, Lutz] ETH, CH-8092 Zurich, Switzerland. [Leydesdorff, Loet] Univ Amsterdam, ASCoR, NL-1012 CX Amsterdam, Netherlands. [Van den Besselaar, Peter] Rathenau Inst, Sci Syst Assessment Dept, NL-2593 HW The Hague, Netherlands. [Van den Besselaar, Peter] Vrije Univ Amsterdam, Dept Org Sci, Amsterdam, Netherlands. RP Bornmann, L (reprint author), ETH, Zahringerstr 24, CH-8092 Zurich, Switzerland. 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To this end, we take advantage of the dataset provided by the first-ever national research assessment exercise of Italian universities, which involved 20 disciplinary areas, 102 research structures, 18,500 research products, and 6661 peer reviewers. Collaboration intensity neatly varies across disciplines: it is inescapable is most sciences and negligible in most humanities. We measured a general positive association between cardinality of the author set of a paper and citation count as well as peer quality of the contribution. The correlation is stronger when the affiliations of authors are heterogeneous. There exist, however, notable and interesting counter-examples. (C) 2010 Elsevier Ltd. All rights reserved. C1 [Franceschet, Massimo] Univ Udine, Dept Math & Comp Sci, I-33100 Udine, Italy. [Costantini, Antonio] Univ Udine, Dept Agr & Environm Sci, I-33100 Udine, Italy. RP Franceschet, M (reprint author), Univ Udine, Dept Math & Comp Sci, Via Scienze 206, I-33100 Udine, Italy. 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This paper combines topic modeling and path-finding algorithms to determine whether productive authors tend to collaborate with or cite researchers with the same or different interests, and whether highly cited authors tend to collaborate with or cite each other. Taking information retrieval as a test field, the results show that productive authors tend to directly coauthor with and closely cite colleagues sharing the same research interests; they do not generally collaborate directly with colleagues having different research topics, but instead directly or indirectly cite them; and highly cited authors do not generally coauthor with each other, but closely cite each other. Published by Elsevier Ltd. C1 Indiana Univ, Sch Lib & Informat Sci, Bloomington, IN 47405 USA. RP Ding, Y (reprint author), Indiana Univ, Sch Lib & Informat Sci, Bloomington, IN 47405 USA. 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Informetr. PD JAN PY 2011 VL 5 IS 1 BP 187 EP 203 DI 10.1016/j.joi.2010.10.008 PG 17 WC Information Science & Library Science SC Information Science & Library Science GA 698WS UT WOS:000285626000015 ER PT J AU Guns, R Rousseau, R AF Guns, Raf Rousseau, Ronald TI Real and rational variants of the h-index and the g-index SO JOURNAL OF INFORMETRICS LA English DT Article DE Indicators; h-Index; g-Index; Rational h-index; Rational g-index; Real h-index; Real g-index ID ECONOMICS; IRELAND AB The definitions of the rational and real-valued variants of the h-index and g-index are reviewed. It is shown how they can be obtained both graphically and by calculation. Formulae are derived expressing the exact relations between the h-variants and between the g-variants. Subsequently these relations are examined. In a citation context the real h-index is often, but not always, smaller than the rational h-index. It is also shown that the relation between the real and the rational g-index depends on the number of citations of the article ranked g + 1. Maximum differences between h, h(r) and h(rat) on the one hand and between g, g(r) and g(rat) on the other are determined. (C) 2008 Elsevier Ltd. All rights reserved. C1 [Guns, Raf] Univ Antwerp, IBW, B-2000 Antwerp, Belgium. [Rousseau, Ronald] KHBO, Associat KU Leuven, Ind Sci & Technol, B-8400 Oostende, Belgium. [Rousseau, Ronald] Hasselt Univ, B-3590 Diepenbeek, Belgium. [Rousseau, Ronald] Steunpunt O&O Indicatoren, KU Leuven, B-3000 Louvain, Belgium. [Rousseau, Ronald] Dept MSI, B-3000 Louvain, Belgium. RP Guns, R (reprint author), Univ Antwerp, IBW, Venusstr 35,City Campus, B-2000 Antwerp, Belgium. EM raf.guns@ua.ac.be; ronald.rousseau@khbo.be RI Guns, Raf/D-6762-2012 OI Guns, Raf/0000-0003-3129-0330 CR CHAI JC, 2008, P WIS 2008 BERL 4 IN Egghe L, 2006, SCIENTOMETRICS, V69, P131, DOI 10.1007/s11192-006-0144-7 Egghe L., 2006, ISSI NEWSLETTER, V2, P8 Hirsch JE, 2005, P NATL ACAD SCI USA, V102, P16569, DOI 10.1073/pnas.0507655102 Rousseau R., 2006, SIMPLE MODELS CORRES Tol RSJ, 2008, J INFORMETR, V2, P149, DOI 10.1016/j.joi.2008.01.001 Ruane F, 2008, SCIENTOMETRICS, V75, P395, DOI 10.1007/s11192-007-1869-7 NR 7 TC 32 Z9 32 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 1751-1577 J9 J INFORMETR JI J. Informetr. PD JAN PY 2009 VL 3 IS 1 BP 64 EP 71 DI 10.1016/j.joi.2008.11.004 PG 8 WC Information Science & Library Science SC Information Science & Library Science GA 395BI UT WOS:000262496700006 ER PT J AU Chen, P Redner, S AF Chen, P. Redner, S. TI Community structure of the physical review citation network SO JOURNAL OF INFORMETRICS LA English DT Article DE Citation network; Modularity; Community structure; Physical review ID MODEL; POLYACETYLENE; SOLITONS AB We investigate the community structure of physics subfields in the citation network of all Physical Review publications between 1893 and August 2007. We focus on well-cited publications (those receiving more than 100 citations), and apply modularity maximization to uncover major communities that correspond to clearly identifiable subfields of physics. While most of the links between communities connect those with obvious intellectual overlap, there sometimes exist unexpected connections between disparate fields due to the development of a widely applicable theoretical technique or by cross fertilization between theory and experiment. We also examine communities decade by decade and also uncover a small number of significant links between communities that are widely separated in time. (C) 2010 Elsevier Ltd. All rights reserved. C1 [Chen, P.; Redner, S.] Boston Univ, Dept Phys, Ctr Polymer Studies, Boston, MA 02215 USA. RP Redner, S (reprint author), Boston Univ, Dept Phys, Ctr Polymer Studies, 590 Commonwealth Ave, Boston, MA 02215 USA. 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Informetr. PD JUL PY 2010 VL 4 IS 3 BP 278 EP 290 DI 10.1016/j.joi.2010.01.001 PG 13 WC Information Science & Library Science SC Information Science & Library Science GA 607YQ UT WOS:000278543600008 ER PT J AU Lopez-Illescas, C de Moya-Anegon, F Moed, HF AF Lopez-Illescas, Carmen de Moya-Anegon, Felix Moed, Henk F. TI Coverage and citation impact of oncological journals in the Web of Science and Scopus SO JOURNAL OF INFORMETRICS LA English DT Article DE Citation databases; Scopus; Web of science; Medical oncology; Journal coverage; Rankings ID BASIC RESEARCH; QUALITY AB This paper reviews a number of studies comparing Thomson Scientific's Web of Science (WoS) and Elsevier's Scopus. It collates their journal coverage in an important medical subfield: oncology. It is found that all WoS-covered oncological journals (n = 126) are indexed in Scopus, but that Scopus covers many more journals (an additional n = 106). However, the latter group tends to have much lower impact factors than WoS covered journals. Among the top 25% of sources with the highest impact factors in Scopus, 94% is indexed in the WoS, and for the bottom 25% only 6%. In short, in oncology the WoS is a genuine subset of Scopus, and tends to cover the best journals from it in terms of citation impact per paper. Although Scopus covers 90% more oncological journals compared to WoS, the average Scopus-based impact factor for journals indexed by both databases is only 2.6% higher than that based on WoS data. Results reflect fundamental differences in coverage policies: the WoS based on Eugene Garfield's concepts of covering a selective set of most frequently used (cited) journals; Scopus with broad coverage, more similar to large disciplinary literature databases. The paper also found that 'classical', WoS-based impact factors strongly correlate with a new, Scopus-based metric, SCImago JournalRank (SJR), one of a series of new indicators founded on earlier work by Pinski and Narin [Pinski, G., & Narin F. (1976). Citation influence for journal aggregates of scientific publications: Theory, with application to the literature of physics. Information Processing and Management, 12, 297 - 312] that weight citations according to the prestige of the citing journal (Spearman's rho = 0.93). Four lines of future research are proposed. (C) 2008 Elsevier Ltd. All rights reserved. C1 [Lopez-Illescas, Carmen] Univ Granada, Commun & Informat Sci Fac, Dept Lib & Informat Sci, SCImago Grp, E-18071 Granada, Spain. [Moed, Henk F.] Leiden Univ, Ctr Sci & Technol Studies CWTS, NL-2300 RA Leiden, Netherlands. RP Lopez-Illescas, C (reprint author), Univ Granada, Commun & Informat Sci Fac, Dept Lib & Informat Sci, SCImago Grp, Campus Cartuja, E-18071 Granada, Spain. 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Kaur, Jasleen TI Scientific discovery and topological transitions in collaboration networks SO JOURNAL OF INFORMETRICS LA English DT Article DE Scientific discovery; Collaboration networks; Phase transitions; Models of science evolution ID WORD ANALYSIS; SCIENCE; SPREAD; GROWTH; IDEAS AB We analyze the advent and development of eight scientific fields from their inception to maturity and map the evolution of their networks of collaboration over time, measured in terms of co-authorship of scientific papers. We show that as a field develops it undergoes a topological transition in its collaboration structure between a small disconnected graph to a much larger network where a giant connected component of collaboration appears. As a result, the number of edges and nodes in the largest component undergoes a transition between a small fraction of the total to a majority of all occurrences. These results relate to many qualitative observations of the evolution of technology and discussions of the "structure of scientific revolutions". We analyze this qualitative change in network topology in terms of several quantitative graph theoretical measures, such as density, diameter, and relative size of the network's largest component. To analyze examples of scientific discovery we built databases of scientific publications based on keyword and citation searches, for eight fields, spanning experimental and theoretical science, across areas as diverse as physics, biomedical sciences, and materials science. Each of the databases was vetted by field experts and is the result of a bibliometric search constructed to maximize coverage, while minimizing the occurrence of spurious records. In this way we built databases of publications and authors for superstring theory, cosmic strings and other topological defects, cosmological inflation, carbon nanotubes, quantum computing and computation, prions and scrapie, and H5N1 influenza. We also built a database for a classical example of "pathological" science, namely cold fusion. All these fields also vary in size and in their temporal patterns of development, with some showing explosive growth from an original identifiable discovery (e.g. carbon nanotubes) while others are characterized by a slow process of development (e.g. quantum computers and computation). We show that regardless of the detailed nature of their developmental paths, the process of scientific discovery and the rearrangement of the collaboration structure of emergent fields is characterized by a number of universal features, suggesting that the process of discovery and initial formation of a scientific field, characterized by the moments of discovery, invention and subsequent transition into "normal science" may be understood in general terms, as a process of cognitive and social unification out of many initially separate efforts. Pathological fields, seemingly, never undergo this transition, despite hundreds of publications and the involvement of many authors. (C) 2009 Elsevier Ltd. All rights reserved. C1 [Bettencourt, Luis M. A.; Kaur, Jasleen] Los Alamos Natl Lab, Div Theoret, Los Alamos, NM 87545 USA. [Bettencourt, Luis M. A.] Santa Fe Inst, Santa Fe, NM 87501 USA. [Kaiser, David I.] MIT, Program Sci Technol & Soc, Cambridge, MA 02139 USA. [Kaiser, David I.] MIT, Dept Phys, Cambridge, MA 02139 USA. RP Bettencourt, LMA (reprint author), Los Alamos Natl Lab, Div Theoret, T-5 MS B284, Los Alamos, NM 87545 USA. 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PD JUL PY 2009 VL 3 IS 3 BP 210 EP 221 DI 10.1016/j.joi.2009.03.001 PG 12 WC Information Science & Library Science SC Information Science & Library Science GA 459WT UT WOS:000267144200005 ER PT J AU Bornmann, L Daniel, HD AF Bornmann, Lutz Daniel, Hans-Dieter TI Convergent validation of peer review decisions using the h index - Extent of and reasons for type I and type II errors SO JOURNAL OF INFORMETRICS LA English DT Article DE research performance; h index; Hirsch index; convergent validity; peer review; type I and type II errors ID PREDICTIVE-VALIDITY; COMMITTEE; SELECTION; PUBLICATIONS; SCIENTISTS; FAIRNESS; JOURNALS AB Hirsch [Hirsch, J. E. (2005). An index to quantify an individual's scientific research output. Proceedings of the National Academy of Sciences of the United States of America, 102(46), 16569-16572] has proposed the h index as a single-number criterion to evaluate the scientific output of a researcher. We investigated the convergent validity of decisions for awarding long-term fellowships to post-doctoral researchers as practiced by the Boehringer Ingelheim Fonds (B.I.F.) by using the h index. Our study examined 414 B.I.F. applicants (64 approved and 350 rejected) with a total of 1586 papers. The results of our study show that the applicants' h indices correlate substantially with standard bibliometric indicators. Even though the h indices of approved B.I.F. applicants on average (arithmetic mean and median) are higher than those of rejected applicants (and with this, fundamentally confirm the validity of the funding decisions), the distributions of the h indices show in part overlaps that we categorized as type I error (falsely drawn approval) or type II error (falsely drawn rejection). Approximately, one-third of the decisions to award a fellowship to an applicant show a type I error, and about one-third of the decisions not to award a fellowship to an applicant show a type II error. Our analyses of possible reasons for these errors show that the applicant's field of study but not personal ties between the B.I.F. applicant and the B.I.F. can increase or decrease the risks for type I and type II errors. (c) 2007 Elsevier Ltd. All rights reserved. C1 [Bornmann, Lutz; Daniel, Hans-Dieter] ETH, CH-8092 Zurich, Switzerland. [Daniel, Hans-Dieter] Univ Zurich, Evaluat Off, CH-8001 Zurich, Switzerland. RP Bornmann, L (reprint author), ETH, Zaehringerstr 24, CH-8092 Zurich, Switzerland. EM bornmann@gess.ethz.ch; daniel@evaluation.unizh.ch RI Daniel, Hans-Dieter/A-2419-2013; Bornmann, Lutz/A-3926-2008 OI Bornmann, Lutz/0000-0003-0810-7091 CR [Anonymous], 2005, SCIENCE, V309, P1181 *BOEHR ING FDN, 1999, FDN PROGR BORMANN L, 1998, J AM SOC INFORM SCI Bornmann L, 2005, INT J SELECT ASSESS, V13, P296, DOI 10.1111/j.1468-2389.2005.00326.x Bornmann L, 2006, SCIENTOMETRICS, V68, P427, DOI 10.1007/s11192-006-0121-1 Bornmann L, 2005, SCIENTOMETRICS, V63, P297, DOI 10.1007/s11192-005-0214-2 Bornmann L, 2005, RES EVALUAT, V14, P15, DOI 10.3152/147154405781776283 Campanario JM, 1998, SCI COMMUN, V19, P277, DOI 10.1177/1075547098019004002 Cohen J, 1988, STAT POWER ANAL BEHA COLE JR, 2000, WEB KNOWLEDGE FESTSC, P281 Conroy R. 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Informetr. PD JUL PY 2007 VL 1 IS 3 BP 204 EP 213 DI 10.1016/j.joi.2007.01.002 PG 10 WC Information Science & Library Science SC Information Science & Library Science GA 272BE UT WOS:000253831700004 ER PT J AU Rousseau, R AF Rousseau, Ronald TI The influence of missing publications on the Hirsch index SO JOURNAL OF INFORMETRICS LA English DT Article DE Hirsch index; influence of missing data; power law model; robustness ID H-INDEX AB We show that usually the influence on the Hirsch index of missing highly cited articles is much smaller than the number of missing articles. This statement is shown by a combinatorial argument. We further show, by using a continuous power law model, that the influence of missing articles is largest when the total number of publications is small, and non-existing when the number of publications is very large. The same conclusion can be drawn for missing citations. Hence, the h-index is resilient to missing articles and to missing citations. (c) 2006 Elsevier Ltd. All rights reserved. C1 [Rousseau, Ronald] KHBO, Assoc KU Leuven, Dept Ind Sci & Technol, B-8400 Oostende, Belgium. [Rousseau, Ronald] Univ Antwerp, IBW, B-2610 Antwerp, Belgium. [Rousseau, Ronald] Hasselt Univ, B-3590 Diepenbeek, Belgium. RP Rousseau, R (reprint author), KHBO, Assoc KU Leuven, Dept Ind Sci & Technol, Zeedijk 101, B-8400 Oostende, Belgium. 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PD JAN PY 2007 VL 1 IS 1 BP 2 EP 7 DI 10.1016/j.joi.2006.05.001 PG 6 WC Information Science & Library Science SC Information Science & Library Science GA 274AN UT WOS:000253974300002 ER PT J AU Cobo, MJ Lopez-Herrera, AG Herrera-Viedma, E Herrera, F AF Cobo, M. J. Lopez-Herrera, A. G. Herrera-Viedma, E. Herrera, F. TI An approach for detecting, quantifying, and visualizing the evolution of a research field: A practical application to the Fuzzy Sets Theory field SO JOURNAL OF INFORMETRICS LA English DT Article DE Science mapping; Co-word analysis; Bibliometric studies; Fuzzy Sets Theory; Thematic evolution; h-Index ID CO-WORD ANALYSIS; SIMILARITY MEASURES; CITATION ANALYSIS; SCIENCE; MAPS; COCITATION; NETWORK; MODEL; SCIENTOMETRICS; SURFACTANTS AB This paper presents an approach to analyze the thematic evolution of a given research field. This approach combines performance analysis and science mapping for detecting and visualizing conceptual subdomains (particular themes or general thematic areas). It allows us to quantify and visualize the thematic evolution of a given research field. To do this, co-word analysis is used in a longitudinal framework in order to detect the different themes treated by the research field across the given time period. The performance analysis uses different bibliometric measures, including the h-index, with the purpose of measuring the impact of both the detected themes and thematic areas. The presented approach includes a visualization method for showing the thematic evolution of the studied field. Then, as an example, the thematic evolution of the Fuzzy Sets Theory field is analyzed using the two most important journals in the topic: Fuzzy Sets and Systems and IEEE Transactions on Fuzzy Systems. (C) 2010 Elsevier Ltd. All rights reserved. C1 [Cobo, M. J.; Lopez-Herrera, A. G.; Herrera-Viedma, E.; Herrera, F.] Univ Granada, Dept Comp Sci & Artificial Intelligence, CITIC UGR Res Ctr Informat & Commun Technol, E-18071 Granada, Spain. RP Cobo, MJ (reprint author), Univ Granada, Dept Comp Sci & Artificial Intelligence, CITIC UGR Res Ctr Informat & Commun Technol, E-18071 Granada, Spain. 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J., 2005, MEASUREMENT, V3, P1, DOI DOI 10.1207/S15366359MEA0301_1 Van Raan A.F.J., 2005, HDB QUANTITATIVE SCI, P19 van Eck NJ, 2009, J AM SOC INF SCI TEC, V60, P1635, DOI 10.1002/asi.21075 Van Eck NJ, 2007, INT J UNCERTAIN FUZZ, V15, P625, DOI 10.1142/S0218488507004911 ZADEH LA, 1965, INFORM CONTROL, V8, P338, DOI 10.1016/S0019-9958(65)90241-X Zadeh LA, 2008, INFORM SCIENCES, V178, P2751, DOI 10.1016/j.ins.2008.02.012 Zitt M, 2000, SCIENTOMETRICS, V47, P627, DOI 10.1023/A:1005632319799 NR 56 TC 27 Z9 27 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 1751-1577 EI 1875-5879 J9 J INFORMETR JI J. Informetr. PD JAN PY 2011 VL 5 IS 1 BP 146 EP 166 DI 10.1016/j.joi.2010.10.002 PG 21 WC Information Science & Library Science SC Information Science & Library Science GA 698WS UT WOS:000285626000012 ER PT J AU Kousha, K Thelwall, M Rezaie, S AF Kousha, Kayvan Thelwall, Mike Rezaie, Somayeh TI Using the Web for research evaluation: The Integrated Online Impact indicator SO JOURNAL OF INFORMETRICS LA English DT Article DE Web citation; Online impact; Research evaluation; Webometrics ID GOOGLE SCHOLAR CITATIONS; 4 SCIENCE DISCIPLINES; SOCIAL-SCIENCE; OF-SCIENCE; H-INDEX; SCOPUS; COVERAGE; JOURNALS; SEARCH; COUNTS AB Previous research has shown that citation data from different types of Web sources can potentially be used for research evaluation. Here we introduce a new combined Integrated Online Impact (IOI) indicator. For a case study, we selected research articles published in the Journal of the American Society for Information Science & Technology (JASIST) and Scientometrics in 2003. We compared the citation counts from Web of Science (WoS) and Scopus with five online sources of citation data including Google Scholar, Google Books, Google Blogs, PowerPoint presentations and course reading lists. The mean and median IOI was nearly twice as high as both WoS and Scopus, confirming that online citations are sufficiently numerous to be useful for the impact assessment of research. Wealso found significant correlations between conventional and online impact indicators, confirming that both assess something similar in scholarly communication. Further analysis showed that the overall percentage for unique Google Scholar citations outside the WoS were 73% and 60% for the articles published in JASIST and Scientometrics, respectively. An important conclusion is that in subject areas where wider types of intellectual impact indicators outside the WoS and Scopus databases are needed for research evaluation, IOI can be used to help monitor research performance. (C) 2009 Elsevier Ltd. All rights reserved. C1 [Kousha, Kayvan] Univ Tehran, Dept Lib & Informat Sci, Tehran, Iran. [Thelwall, Mike] Wolverhampton Univ, Sch Comp & Informat Technol, Wolverhampton WV1 1ST, W Midlands, England. [Rezaie, Somayeh] Shaheed Beheshti Univ, Dept Lib & Informat Sci, Tehran, Iran. RP Kousha, K (reprint author), Univ Tehran, Dept Lib & Informat Sci, Jalle Ahmad Highway,POB 14155-6456, Tehran, Iran. EM kkoosha@ut.ac.ir; m.thelwall@wlv.ac.uk; s_aries80@yahoo.com RI Kousha, Kayvan/B-1937-2010; Thelwall, Mike/C-1449-2013 OI Thelwall, Mike/0000-0001-6065-205X CR Ajiferuke I., 2009, P 12 INT C INT SOC S, P798 Bar-Ilan J, 2004, SCIENTOMETRICS, V59, P391, DOI 10.1023/B:SCIE.0000018540.33706.c1 Bar-Ilan J, 2005, INFORM PROCESS MANAG, V41, P973, DOI 10.1016/j.ipm.2004.02.005 Bar-Ilan J, 2008, SCIENTOMETRICS, V74, P257, DOI 10.1007/s11192-008-0216-y Bauer K., 2005, D LIB MAGAZINE, V11 BEIEW R, 2005, SCI IMPACT QUANTITY Borgman CL, 2002, ANNU REV INFORM SCI, V36, P3 Bornmann L, 2009, J INFORMETR, V3, P27, DOI 10.1016/j.joi.2008.11.001 Crane D., 1972, INVISIBLE COLL DIFFU Harzing AW, 2009, J AM SOC INF SCI TEC, V60, P41, DOI 10.1002/asi.20953 Harzing A.W., 2007, ETHICS SCI ENV POLIT, V8, P61, DOI DOI 10.3354/esep00076 Hirsch JE, 2005, P NATL ACAD SCI USA, V102, P16569, DOI 10.1073/pnas.0507655102 Jacso P, 2006, ONLINE INFORM REV, V30, P297, DOI 10.1108/14684520610675816 Jacso P, 2005, CURR SCI INDIA, V89, P1537 Jacso P, 2005, LECT NOTES COMPUT SC, V3815, P360 Kousha K, 2008, SCIENTOMETRICS, V74, P273, DOI 10.1007/s11192-008-0217-x Kousha K, 2008, J AM SOC INF SCI TEC, V59, P2060, DOI 10.1002/asi.20920 Kousha K, 2007, J AM SOC INF SCI TEC, V58, P1055, DOI 10.1002/asi.20584 Kousha K, 2009, J AM SOC INF SCI TEC, V60, P1537, DOI 10.1002/asi.21085 Kousha K, 2007, LIBR INFORM SCI RES, V29, P495, DOI 10.1016/j.lisr.2007.05.003 Meho LI, 2007, J AM SOC INF SCI TEC, V58, P2105, DOI 10.1002/asi.20677 Moed H.F., 2005, CITATION ANAL RES EV Nederhof AJ, 2006, SCIENTOMETRICS, V66, P81, DOI 10.1007/s11192-006-0007-2 Norris M, 2007, J INFORMETR, V1, P161, DOI 10.1016/j.joi.2006.12.001 Schneider J.W., 2009, P 12 INT C SCI INF I, P443 Thelwall M, 2008, J AM SOC INF SCI TEC, V59, P805, DOI 10.1002/asi.20803 Trowler P, 2001, ACAD TRIBES TERRITOR Vaughan L, 2003, J AM SOC INF SCI TEC, V54, P1313, DOI 10.1002/asi.10338 Vaughan L, 2005, J AM SOC INF SCI TEC, V56, P1075, DOI 10.1002/asi.20199 Walters WH, 2007, INFORM PROCESS MANAG, V43, P1121, DOI 10.1016/j.ipm.2006.08.006 NR 30 TC 27 Z9 28 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 1751-1577 J9 J INFORMETR JI J. Informetr. PD JAN PY 2010 VL 4 IS 1 BP 124 EP 135 DI 10.1016/j.joi.2009.10.003 PG 12 WC Information Science & Library Science SC Information Science & Library Science GA 530ZI UT WOS:000272631100014 ER PT J AU Moussa, S Touzani, M AF Moussa, Salim Touzani, Mourad TI Ranking marketing journals using the Google Scholar-based hg-index SO JOURNAL OF INFORMETRICS LA English DT Article DE Marketing journals; Ranking; Google Scholar; h-index; g-index; hg-index ID SELF-CITATION CORRECTIONS; WEB-OF-SCIENCE; EGGHES G-INDEX; ENHANCED DATABASES; BIBLIOMETRIC DATA; HIRSCH INDEX; IMPACT; SCOPUS; SCIENTISTS; BUSINESS AB This paper provides a ranking of 69 marketing journals using a new Hirsch-type index, the hg-index which is the geometric mean of hg. The applicability of this index is tested on data retrieved from Google Scholar on marketing journal articles published between 2003 and 2007. The authors investigate the relationship between the hg-ranking, ranking implied by Thomson Reuters' Journal Impact Factor for 2008, and rankings in previous citation-based studies of marketing journals. They also test two models of consumption of marketing journals that take into account measures of citing (based on the hg-index), prestige, and reading preference. (C) 2009 Elsevier Ltd. All rights reserved. C1 [Moussa, Salim] Univ Gafsa, Inst Super Etud Appl Humanites Gafsa, Gafsa, Tunisia. [Moussa, Salim; Touzani, Mourad] Univ Tunis, Inst Super Gest, Tunis, Tunisia. RP Moussa, S (reprint author), Univ Gafsa, Inst Super Etud Appl Humanites Gafsa, Cite Jeunes 2133, Gafsa, Tunisia. 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Informetr. PD JAN PY 2010 VL 4 IS 1 BP 107 EP 117 DI 10.1016/j.joi.2009.10.001 PG 11 WC Information Science & Library Science SC Information Science & Library Science GA 530ZI UT WOS:000272631100012 ER PT J AU Tol, RSJ AF Tol, Richard S. J. TI A rational, successive g-index applied to economics departments in Ireland SO JOURNAL OF INFORMETRICS LA English DT Article DE department rankings; g-index; h-index ID SCIENTIFIC-RESEARCH OUTPUT AB A rational, successive g-index is proposed, and applied to economics departments in Ireland. The successive g-index has greater discriminatory power than the successive h-index, and the rational index performs better still. The rational, successive g-index is also more robust to differences in department size. (C) 2008 Elsevier Ltd. All rights reserved. C1 [Tol, Richard S. J.] Econ & Social Res Inst, Dublin, Ireland. [Tol, Richard S. J.] Vrije Univ Amsterdam, Inst Environm Studies, Amsterdam, Netherlands. [Tol, Richard S. J.] Carnegie Mellon Univ, Dept Engn & Publ Policy, Pittsburgh, PA 15213 USA. RP Tol, RSJ (reprint author), Econ & Social Res Inst, Dublin, Ireland. EM richard.tol@esri.ie RI Tol, Richard/D-5245-2011 OI Tol, Richard/0000-0002-8012-3988 CR Egghe L, 2006, SCIENTOMETRICS, V69, P131, DOI 10.1007/s11192-006-0144-7 Harzing A-W., 2007, GOOGLE SCHOLAR NEW D Hirsch JE, 2005, P NATL ACAD SCI USA, V102, P16569, DOI 10.1073/pnas.0507655102 Jin B., 2006, SCI FOCUS, V1, P8 Jin BH, 2007, CHINESE SCI BULL, V52, P855, DOI 10.1007/s11434-007-0145-9 Kousha K, 2007, J AM SOC INF SCI TEC, V58, P1055, DOI 10.1002/asi.20584 Pauly D., 2005, ETHICS SCI ENV POLIT, P33 Prathap G, 2006, CURR SCI INDIA, V91, P1439 ROUSSEAU R, 2007, SIMPLE MODELS CORRES Ruane F. P., 2007, ECON SOC REV, V38, P289 RUANE FP, IN PRESS RATIONAL SU Schubert A, 2007, SCIENTOMETRICS, V70, P201, DOI 10.1007/s11192-007-0112-x NR 12 TC 27 Z9 27 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 1751-1577 J9 J INFORMETR JI J. Informetr. PD APR PY 2008 VL 2 IS 2 BP 149 EP 155 DI 10.1016/j.joi.2008.01.001 PG 7 WC Information Science & Library Science SC Information Science & Library Science GA 296TK UT WOS:000255568500004 ER PT J AU Gingras, Y Lariviere, V AF Gingras, Yves Lariviere, Vincent TI There are neither "king" nor "crown" in scientometrics: Comments on a supposed "alternative" method of normalization SO JOURNAL OF INFORMETRICS LA English DT Letter C1 [Gingras, Yves; Lariviere, Vincent] Univ Quebec, Observ Sci & Technol, Montreal, PQ H3C 3P8, Canada. [Lariviere, Vincent] Indiana Univ, SLIS, Bloomington, IN USA. RP Lariviere, V (reprint author), Univ Quebec, Observ Sci & Technol, Montreal, PQ H3C 3P8, Canada. EM lariviere.vincent@uqam.ca CR Bornmann L, 2008, J DOC, V64, P45, DOI 10.1108/00220410810844150 Lundberg J, 2007, J INFORMETR, V1, P145, DOI 10.1016/j.joi.2006.09.007 Moed HF, 2010, J INFORMETR, V4, P436, DOI 10.1016/j.joi.2010.03.009 Moed H.F., 2005, CITATION ANAL RES EV OPTHOF T, 2010, J INFORMETR, V4, P439 SPAAN JAE, 2010, J INFORMETR, V4, P423 VANRAAN AFJ, 2010, STI C 9 11 SEPT LEID, P291 van Raan AFJ, 2010, J INFORMETR, V4, P431, DOI 10.1016/j.joi.2010.03.008 WALTMAN L, 2010, ARXIV10041632 Waltman L, 2011, J INFORMETR, V5, P37, DOI 10.1016/j.joi.2010.08.001 NR 10 TC 25 Z9 25 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 1751-1577 J9 J INFORMETR JI J. Informetr. PD JAN PY 2011 VL 5 IS 1 BP 226 EP 227 DI 10.1016/j.joi.2010.10.005 PG 2 WC Information Science & Library Science SC Information Science & Library Science GA 698WS UT WOS:000285626000020 ER PT J AU Haustein, S Siebenlist, T AF Haustein, Stefanie Siebenlist, Tobias TI Applying social bookmarking data to evaluate journal usage SO JOURNAL OF INFORMETRICS LA English DT Article DE Journal evaluation; Usage statistics; Download data; COUNTER; Reader perception; Social bookmarking; Tagging; Science 2.0; CiteULike; Connotea; BibSonomy ID CITATION ANALYSIS; IMPACT; LIBRARIES; METRICS AB Web 2.0 technologies are finding their way into academics: specialized social bookmarking services allow researchers to store and share scientific literature online. By bookmarking and tagging articles, academic prosumers generate new information about resources, i.e. usage statistics and content description of scientific journals. Given the lack of global download statistics, the authors propose the application of social bookmarking data to journal evaluation. For a set of 45 physics journals all 13,608 bookmarks from CiteULike, Connotea and BibSonomy to documents published between 2004 and 2008 were analyzed. This article explores bookmarking data in STM and examines in how far it can be used to describe the perception of periodicals by the readership. Four basic indicators are defined, which analyze different aspects of usage: Usage Ratio, Usage Diffusion, Article Usage Intensity and Journal Usage Intensity. Tags are analyzed to describe a reader-specific view on journal content. (C) 2011 Elsevier Ltd. All rights reserved. C1 [Haustein, Stefanie] Forschungszentrum Julich, Cent Lib, D-52425 Julich, Germany. [Haustein, Stefanie; Siebenlist, Tobias] Univ Dusseldorf, Dept Informat Sci, D-40225 Dusseldorf, Germany. RP Haustein, S (reprint author), Forschungszentrum Julich, Cent Lib, D-52425 Julich, Germany. 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Informetr. PD JUL PY 2011 VL 5 IS 3 BP 446 EP 457 DI 10.1016/j.joi.2011.04.002 PG 12 WC Information Science & Library Science SC Information Science & Library Science GA 769QF UT WOS:000291032500013 ER PT J AU Franceschet, M Costantini, A AF Franceschet, Massimo Costantini, Antonio TI The first Italian research assessment exercise: A bibliometric perspective SO JOURNAL OF INFORMETRICS LA English DT Article DE Research assessment; Peer review; Bibliometrics ID CITATION DISTRIBUTIONS; HIRSCH-INDEX; H-INDEX; INDICATORS; SCIENCE; UNIVERSALITY; VALIDATION; CHEMISTRY; METRICS; IMPACT AB In December 2003, seventeen years after the first UK research assessment exercise, Italy started up its first-ever national research evaluation, with the aim to evaluate, using the peer review method, the excellence of the national research production. The evaluation involved 20 disciplinary areas, 102 research structures, 18,500 research products and 6661 peer reviewers (1465 from abroad); it had a direct cost of 3.55 millions Euros and a time length spanning over 18 months. The introduction of ratings based on ex post quality of output and not on ex ante respect for parameters and compliance is an important leap forward of the national research evaluation system toward meritocracy. From the bibliometric perspective, the national assessment offered the unprecedented opportunity to perform a large-scale comparison of peer review and bibliometric indicators for an important share of the Italian research production. The present investigation takes full advantage of this opportunity to test whether peer review judgements and (article and journal) bibliometric indicators are independent variables and, in the negative case, to measure the sign and strength of the association. 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Informetr. PD APR PY 2011 VL 5 IS 2 BP 275 EP 291 DI 10.1016/j.joi.2010.12.002 PG 17 WC Information Science & Library Science SC Information Science & Library Science GA 732AV UT WOS:000288154700004 ER PT J AU Perc, M AF Perc, Matjaz TI Growth and structure of Slovenia's scientific collaboration network SO JOURNAL OF INFORMETRICS LA English DT Article DE Scientific collaboration; Networks; Preferential attachment; Small worlds; Slovenia ID SMALL-WORLD NETWORKS; COMPLEX NETWORKS; GROWING NETWORKS; H-INDEX; DISTRIBUTIONS; EVOLUTION; DYNAMICS; INTERNET; GRAPHS; ATTACK AB We study the evolution of Slovenia's scientific collaboration network from 1960 till present with a yearly resolution. For each year the network was constructed from publication records of Slovene scientists, whereby two were connected if, up to the given year inclusive, they have coauthored at least one paper together. Starting with no more than 30 scientists with an average of 1.5 collaborators in the year 1960, the network to date consists of 7380 individuals that, on average, have 10.7 collaborators. We show that, in spite of the broad myriad of research fields covered, the networks form "small worlds" and that indeed the average path between any pair of scientists scales logarithmically with size after the largest component becomes large enough. Moreover, we show that the network growth is governed by near-liner preferential attachment, giving rise to a log-normal distribution of collaborators per author, and that the average starting year is roughly inversely proportional to the number of collaborators eventually acquired. Understandably, not all that became active early have till now gathered many collaborators. We also give results for the clustering coefficient and the diameter of the network over time, and compare our conclusions with those reported previously. (C) 2010 Elsevier Ltd. All rights reserved. C1 Univ Maribor, Fac Nat Sci & Math, Dept Phys, SI-2000 Maribor, Slovenia. RP Perc, M (reprint author), Univ Maribor, Fac Nat Sci & Math, Dept Phys, Koroska Cesta 160, SI-2000 Maribor, Slovenia. 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But it has been criticized for its insufficient accuracy-the ability to discriminate reliably between meaningful amounts of research output. As a single measure it cannot capture the complete information on the citation distribution over a scientist's publication list. An extensive data set with bibliometric data on scientists working in the field of molecular biology is taken as an example to introduce two approaches providing additional information to the h index: (1) h(2) lower, h(2) center, and h(2) upper are proposed, which allow quantification of three areas within a scientist's citation distribution: the low impact area (h(2) lower), the area captured by the h index (h(2) center), and the area of publications with the highest visibility (h(2) upper). 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Informetr. PD JUL PY 2010 VL 4 IS 3 BP 407 EP 414 DI 10.1016/j.joi.2010.03.005 PG 8 WC Information Science & Library Science SC Information Science & Library Science GA 607YQ UT WOS:000278543600019 ER PT J AU Franceschet, M AF Franceschet, Massimo TI Journal influence factors SO JOURNAL OF INFORMETRICS LA English DT Article DE Journal influence measures; Impact factor; Eigenfactor metrics; Cross-field variability ID BIBLIOMETRIC INDICATORS; IMPACT FACTOR; CITATION; INFORMETRICS; PAGERANK; METRICS AB We performed a thorough comparison of four main indicators of journal influence, namely 2-year impact factor, 5-year impact factor, eigenfactor and article influence. These indicators have been recently added by Thomson Reuters to the Journal Citation Reports, in both science and social science editions, and are thus available for study and comparison over a sample of significative size. We find that the distribution associated with the eigenfactor largely differs from the distribution of the other surveyed measures in terms of deviation from the mean, concentration, entropy, and skewness. Moreover, it is the one that best fits to the lognormal theoretical model. Surprisingly, the eigenfactor is also the most variable indicator when computed across different fields of science and social science, while article influence is the most stable in this respect, and hence the most suitable metric to be used interdisciplinarily. Finally, the journal rankings provided by impact factors and article influence are relatively similar and diverge from the one produced by eigenfactor, which is closer to that given by the total number of received citations. (C) 2009 Elsevier Ltd. All rights reserved. C1 Univ Udine, Dept Math & Comp Sci, I-33100 Udine, Italy. RP Franceschet, M (reprint author), Univ Udine, Dept Math & Comp Sci, Via Sci 206, I-33100 Udine, Italy. 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Informetr. PD JUL PY 2010 VL 4 IS 3 BP 239 EP 248 DI 10.1016/j.joi.2009.12.002 PG 10 WC Information Science & Library Science SC Information Science & Library Science GA 607YQ UT WOS:000278543600004 ER PT J AU Lucio-Arias, D Leydesdorff, L AF Lucio-Arias, Diana Leydesdorff, Loet TI The dynamics of exchanges and references among scientific texts, and the autopoiesis of discursive knowledge SO JOURNAL OF INFORMETRICS LA English DT Article DE Codification; Validation; Self-organization; Autopoiesis; Discursive knowledge; Intellectual organization; Systems theory; Probabilistic entropy ID UNIVERSITY-INDUSTRY-GOVERNMENT; TRIPLE-HELIX; CITATION; DIMENSIONS; SYSTEMS; SCIENCE; MODEL AB Discursive knowledge emerges as codification in flows of communication. The flows of communication are constrained and enabled by networks of communications as their historical manifestations at each moment of time. New publications modify the existing networks by changing the distributions of attributes and relations in document sets, while the networks are self-referentially updated along trajectories. Codification operates reflexively: the network structures are reconstructed from the perspective of hindsight. Codification along different axes differentiates discursive knowledge into specialties. These intellectual control structures are constructed bottom-up, but feed top-down back upon the production of new knowledge. However, the forward dynamics of diffusion in the development of the communication networks along trajectories differs from the feedback mechanisms of control. Analysis of the development of scientific communication in terms of evolving scientific literatures provides us with a model which makes these evolutionary processes amenable to measurement. (C) 2009 Elsevier Ltd. All rights reserved. C1 [Lucio-Arias, Diana; Leydesdorff, Loet] Univ Amsterdam, Amsterdam Sch Commun Res ASCoR, NL-1012 CX Amsterdam, Netherlands. RP Lucio-Arias, D (reprint author), Univ Amsterdam, Amsterdam Sch Commun Res ASCoR, Kloveniersburgwal 48, NL-1012 CX Amsterdam, Netherlands. EM d.p.Lucioarias@uva.nl; loet@leydesdorff.net RI Leydesdorff, Loet/E-2903-2010 OI Leydesdorff, Loet/0000-0002-7835-3098 CR Abramson N., 1963, INFORM THEORY CODING AMSTERDAMSKA O, 1989, SCIENTOMETRICS, V15, P449, DOI 10.1007/BF02017065 Ashby W. 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E., 1997, ECOLOGY ASCENDENT PE White HD, 2004, J AM SOC INF SCI TEC, V55, P111, DOI 10.1002/asi.10369 Whitley R., 1984, INTELLECTUAL SOCIAL Wouters P, 1999, SCIENTOMETRICS, V44, P561, DOI 10.1007/BF02458496 Yeung RW, 2008, INFORM TECH TRANS PR, P1 NR 76 TC 24 Z9 24 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 1751-1577 EI 1875-5879 J9 J INFORMETR JI J. Informetr. PD JUL PY 2009 VL 3 IS 3 BP 261 EP 271 DI 10.1016/j.joi.2009.03.003 PG 11 WC Information Science & Library Science SC Information Science & Library Science GA 459WT UT WOS:000267144200009 ER PT J AU Tian, YG Wen, C Hong, S AF Tian, Yangge Wen, Cheng Hong, Song TI Global scientific production on GIS research by bibliometric analysis from 1997 to 2006 SO JOURNAL OF INFORMETRICS LA English DT Article DE GIS; bibliometric; research trend; author keyword analysis ID CITATION ANALYSIS; INDICATORS; DATABASE; QUALITY; IMPACT; WEB AB A bibliometric analysis was applied in this work to evaluate global scientific production of geographic information system (GIS) papers from 1997 to 2006 in any journal of all the subject categories of the Science Citation Index compiled by Institute for Scientific Information (ISI), Philadelphia, USA. 'GIS' and 'geographic information system' were used as keywords to search parts of titles, abstracts, or keywords. The published output analysis showed that GIS research steadily increased over the past 10 years and the annual paper production in 2006 was about three times 1997s paper production. There are clear distinctions among author keywords used in publications from the five most productive countries (USA, UK, Canada, Germany and China) in GIS research. Bibliometric methods could quantitatively characterize the development of global scientific production in a specific research field. The analytical results eventually provide several key findings. (C) 2007 Elsevier Ltd. All rights reserved. C1 [Wen, Cheng; Hong, Song] Wuhan Univ, Sch Resource & Environm Sci, Wuhan 430079, Peoples R China. [Tian, Yangge] Wuhan Univ, Int Sch Software, Wuhan 430079, Peoples R China. RP Hong, S (reprint author), Wuhan Univ, Sch Resource & Environm Sci, Wuhan 430079, Peoples R China. EM songhongpku@126.com RI Mafutsana, Mopedi/C-5157-2015 CR Almind TC, 1997, J DOC, V53, P404, DOI 10.1108/EUM0000000007205 ANSELIN L, 1995, GEOGR ANAL, V27, P93 Arnold JG, 1998, J AM WATER RESOUR AS, V34, P73, DOI 10.1111/j.1752-1688.1998.tb05961.x ARRUE J L, 1991, Suelo y Planta, V1, P555 BAYER AE, 1966, SOCIOL EDUC, V39, P381, DOI 10.2307/2111920 Chiu WT, 2005, SCIENTOMETRICS, V63, P3, DOI 10.1007/s11192-005-0201-7 Cronin B, 2001, J INFORM SCI, V27, P1 DANNENBERG AL, 1985, AM J EPIDEMIOL, V121, P140 Davis J. 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Informetr. PY 2008 VL 2 IS 1 BP 65 EP 74 DI 10.1016/j.joi.2007.10.001 PG 10 WC Information Science & Library Science SC Information Science & Library Science GA 270LL UT WOS:000253722200003 ER PT J AU Jarneving, B AF Jarneving, Bo TI Bibliographic coupling and its application to research-front and other core documents SO JOURNAL OF INFORMETRICS LA English DT Article DE bibliographic coupling; science mapping; cluster analysis ID SCIENTIFIC LITERATURES; SCIENCE; INFORMATION; COCITATION AB Based on previous findings and theoretical considerations, it was suggested that bibliographic coupling could be combined with a cluster method to provide a method for science mapping, complementary to the prevailing co-citation cluster analytical method. The complete link cluster method was on theoretical grounds assumed to provide a suitable cluster method for this purpose. The objective of the study was to evaluate the proposed method's capability to identify coherent research themes. Applying a large multidisciplinary test bed comprising more than 600,000 articles and 17 million references, the proposed method was tested in accordance with two lines of mapping. In the first line of mapping, all significant (strong) links connecting 'core documents' (strongly and frequently coupled documents) in clusters with any other core document was mapped. This resulted in a depiction of all significant artificially broken links between core documents in a cluster and core documents extrinsic to that cluster. The second line of mapping involved the application of links between clusters only. They were used to successively merge clusters on two subsequent levels of fusion, where the first generation of clusters were considered objects for a second clustering, and the second generation of clusters gave rise to a final cluster fusion. Changes of cluster composition on the three levels were evaluated with regard to several variables. Findings showed that the proposed method could provide with valid depictions of current research, though some severe restrictions would adhere to its application. (c) 2007 Elsevier Ltd. All rights reserved. C1 Swedish Sch Lib & Informat Sci, S-50190 Boras, Sweden. RP Jarneving, B (reprint author), Swedish Sch Lib & Informat Sci, S-50190 Boras, Sweden. EM bo.jarneving@hb.se CR ALDENDERFER MS, 1984, QUANTITATIVE APPL SO, P44 BRAAM RR, 1991, J AM SOC INFORM SCI, V42, P233, DOI 10.1002/(SICI)1097-4571(199105)42:4<233::AID-ASI1>3.0.CO;2-I Everitt B., 2001, CLUSTER ANAL FANO RM, 1956, DOCUMENT ACTION FRANKLIN JJ, 1988, HDB QUANTITATIVE SCI GLANZEL W, 1995, P 5 INT C SCI INF Glanzel W, 1996, SCIENTOMETRICS, V37, P195, DOI 10.1007/BF02093621 GRIFFITH BC, 1974, SCI STUD, V4, P339, DOI 10.1177/030631277400400402 Janssens F., 2006, INSCIT2006 CURRENT R, VI, P615 Jarneving B, 2001, SCIENTOMETRICS, V50, P365, DOI 10.1023/A:1010546312154 Kessler M. 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PY 2007 VL 1 IS 4 BP 287 EP 307 DI 10.1016/j.joi.2007.07.004 PG 21 WC Information Science & Library Science SC Information Science & Library Science GA 272BF UT WOS:000253831900004 ER PT J AU Bornmann, L Schier, H Marx, W Daniel, HD AF Bornmann, Lutz Schier, Hermann Marx, Werner Daniel, Hans-Dieter TI What factors determine citation counts of publications in chemistry besides their quality? SO JOURNAL OF INFORMETRICS LA English DT Article DE Chemistry; Citation counts; Scientific quality; Single publication h index ID H-INDEX; IMPACT FACTOR; SCIENTIFIC-RESEARCH; ANGEWANDTE-CHEMIE; SCIENCE; JOURNALS; PERFORMANCE; INDICATORS; FREQUENCY; BEHAVIOR AB A number of bibliometric studies point out that citation counts are a function of many variables besides scientific quality. In this paper our aim is to investigate these factors that usually impact the number of citation counts, using an extensive data set from the field of chemistry. The data set contains roughly 2000 manuscripts that were submitted to the journal Angewandte Chemie International Edition (AC-IE) as short communications, reviewed by external reviewers, and either published in AC-IE or, if not accepted for publication by AC-IE, published elsewhere. As the reviewers' ratings of the importance of the manuscripts' results are also available to us, we can examine the extent to which certain factors that previous studies demonstrated to be generally correlated with citation counts increase the impact of papers, controlling for the quality of the manuscripts (as measured by reviewers' ratings of the importance of the findings) in the statistical analysis. As the results show, besides being associated with quality, citation counts are correlated with the citation performance of the cited references, the language of the publishing journal, the chemical subfield, and the reputation of the authors. In this study no statistically significant correlation was found between citation counts and number of authors. (C) 2011 Elsevier Ltd. All rights reserved. C1 [Bornmann, Lutz] Max Planck Soc, D-80539 Munich, Germany. [Schier, Hermann; Marx, Werner] Max Planck Inst Solid State Res, D-70569 Stuttgart, Germany. [Daniel, Hans-Dieter] ETH, CH-8092 Zurich, Switzerland. [Daniel, Hans-Dieter] Univ Zurich, Evaluat Off, CH-8001 Zurich, Switzerland. RP Bornmann, L (reprint author), Max Planck Soc, Hofgartenstr 8, D-80539 Munich, Germany. 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TI q(2)-Index: Quantitative and qualitative evaluation based on the number and impact of papers in the Hirsch core SO JOURNAL OF INFORMETRICS LA English DT Article DE h-Index; m-Index; Bibliometric measures; Aggregation; Geometric mean ID MULTIPLE DATA SETS; H-INDEX; STATISTICAL COMPARISONS; R-INDEX; A-INDEX; RESEARCHERS; CLASSIFIERS; INDICATORS; PHYSICISTS; SCIENCE AB Bibliometric studies at the micro level are increasingly requested by science managers and policy makers to support research decisions. Different measures and indices have been developed at this level of analysis. One type of indices, such as the h-index and g-index, describe the most productive core of the output of a researcher and inform about the number of papers in the core. Other indices, such as the a-index and m-index, depict the impact of the papers in the core. In this paper, we present a new index which relates two different dimensions in a researcher's productive core: a quantitative one (number of papers) and a qualitative one (impact of papers). In such a way, we could obtain a more balanced and global view of the scientific production of researchers. This new index, called q(2)-index, is based on the geometric mean of h-index and the median number of citations received by papers in the h-core, i.e., the m-index, which allows us to combine the advantages of both kind of indices. (C) 2009 Elsevier Ltd. All rights reserved. C1 [Alonso, S.] Univ Granada, Software Engn Dept, E-18071 Granada, Spain. [Herrera-Viedma, E.; Herrera, F.] Univ Granada, Dept Comp Sci & Artificial Intelligence, E-18071 Granada, Spain. 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Informetr. PD JAN PY 2010 VL 4 IS 1 BP 23 EP 28 DI 10.1016/j.joi.2009.06.005 PG 6 WC Information Science & Library Science SC Information Science & Library Science GA 530ZI UT WOS:000272631100003 ER PT J AU Quesada, A AF Quesada, Antonio TI Monotonicity and the Hirsch index SO JOURNAL OF INFORMETRICS LA English DT Article DE Hirsch index; Axiomatic characterization; Citation analysis; Research output index AB The Hirsch index is a number that synthesizes a researcher's output. It is the maximum number h such that the researcher has h papers with at least h citations each. Woeginger [ Woeginger, G.J. (2008a). An axiomatic characterization of the Hirsch-index. Mathematical Social Sciences, 56( 2), 224-232; Woeginger, G.J. (2008b). A symmetry axiom for scientific impact indices. Journal of Informetrics, 2( 3), 298-303] characterizes the Hirsch index when indices are assumed to be integer-valued. In this note, the Hirsch index is characterized, when indices are allowed to be real-valued, by adding to Woeginger's monotonicity two axioms in a way related to the concept of monotonicity. (C) 2009 Elsevier Ltd. All rights reserved. C1 Univ Rovira & Virgili, Dept Econ, Reus 43204, Spain. RP Quesada, A (reprint author), Univ Rovira & Virgili, Dept Econ, Avinguda Univ 1, Reus 43204, Spain. EM aqa@urv.cat CR Hirsch JE, 2005, P NATL ACAD SCI USA, V102, P16569, DOI 10.1073/pnas.0507655102 Woeginger GJ, 2008, MATH SOC SCI, V56, P224, DOI 10.1016/j.mathsocsci.2008.03.001 Woeginger GJ, 2008, J INFORMETR, V2, P298, DOI 10.1016/j.joi.2008.09.001 NR 3 TC 22 Z9 22 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 1751-1577 J9 J INFORMETR JI J. Informetr. PD APR PY 2009 VL 3 IS 2 BP 158 EP 160 DI 10.1016/j.joi.2009.01.002 PG 3 WC Information Science & Library Science SC Information Science & Library Science GA 420VM UT WOS:000264317300006 ER PT J AU Torres-Salinas, D Moed, HF AF Torres-Salinas, Daniel Moed, Henk F. TI Library Catalog Analysis as a tool in studies of social sciences and humanities: An exploratory study of published book titles in Economics SO JOURNAL OF INFORMETRICS LA English DT Article DE Library catalogs; Scientific-scholarly books; Social sciences and humanities; Book publishers; Bibliometric indicators; Economics ID CO-WORD ANALYSIS; MANAGEMENT; INDICATORS; SOCIOLOGY AB This paper explores the use of Library Catalog Analysis (LCA), defined as the application of bibliometric or informetric techniques to a set of library online catalogs, to describe quantitatively a scientific-scholarly field on the basis of published book titles. It focuses on its value as a tool in studies of Social Sciences and Humanities, especially its cognitive structures, main book publishers and the research performance of its actors. The paper proposes an analogy model between traditional citation analysis of journal articles and Library Catalog Analysis of book titles. It presents the outcomes of an exploratory study of book titles in Economics included in 42 academic library catalogs from 7 countries. It describes the process of data collection and cleaning, and applies a series of indicators and thematic mapping techniques. It illustrates how LCA can be fruitfully used to assess book production and research performance at the level of an individual researcher, a research department, an entire country and a book publisher. It discusses a number of issues that should be addressed in follow-up studies and concludes that LCA of published book titles can be developed into a powerful and useful tool in studies of Social Sciences and Humanities. (C) 2008 Elsevier Ltd. All rights reserved. C1 [Moed, Henk F.] Leiden Univ, Ctr Sci & Technol Studies CWTS, NL-2300 RA Leiden, Netherlands. [Torres-Salinas, Daniel] Univ Navarra, Ctr Invest Med Aplicada, E-31080 Pamplona, Spain. RP Moed, HF (reprint author), Leiden Univ, Ctr Sci & Technol Studies CWTS, NL-2300 RA Leiden, Netherlands. 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Informetr. PD OCT PY 2008 VL 2 IS 4 BP 298 EP 303 DI 10.1016/j.joi.2008.09.001 PG 6 WC Information Science & Library Science SC Information Science & Library Science GA 372LS UT WOS:000260903700005 ER PT J AU Zhang, L Liu, XH Janssens, F Liang, LM Glanzel, W AF Zhang, Lin Liu, Xinhai Janssens, Frizo Liang, Liming Glanzel, Wolfgang TI Subject clustering analysis based on ISI category classification SO JOURNAL OF INFORMETRICS LA English DT Article; Proceedings Paper CT 1st Joint ASIS&T/ISS Conference Seminar 2009 CY NOV 07, 2009 CL Vancouver, CANADA DE Journal classification; Cross-citation network; Multi-level Aggregation Method ID JOURNAL CITATION RELATIONS; SCIENCE; NETWORKS AB The study focuses on the analysis of the information flow among the ISI subject categories and aims at finding an appropriate field structure of the Web of Science using the subject clustering algorithm developed in previous studies. The clustering journals and ISI subject categories provide two subject classification schemes through different perspectives and levels. The two clustering results have been compared and their accordance and divergence have been analyzed. Several indicators have been used to compare the communication characteristics among different ISI subject categories. The neighbour map of each category clearly reflects the affinities between the "core" category and its satellites around. (C) 2009 Elsevier Ltd. All rights reserved. C1 [Zhang, Lin; Janssens, Frizo; Glanzel, Wolfgang] Katholieke Univ Leuven, Ctr R&D Monitoring, Dept MSI, Leuven, Belgium. [Zhang, Lin; Liang, Liming] Dalian Univ Technol, WISE Lab, Dalian, Peoples R China. [Liu, Xinhai; Janssens, Frizo] Katholieke Univ Leuven, ESAT SCD, Leuven, Belgium. [Liu, Xinhai] Wuhan Univ Sci & Technol, CISE & ERCMAMT, Wuhan, Peoples R China. [Liang, Liming] Henan Normal Univ, Inst Sci Technol & Soc, Xinxiang, Peoples R China. [Glanzel, Wolfgang] Hungarian Acad Sci, IRPS, Budapest, Hungary. RP Glanzel, W (reprint author), Katholieke Univ Leuven, Ctr R&D Monitoring, Dept MSI, Leuven, Belgium. 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Informetr. PD APR PY 2010 VL 4 IS 2 BP 185 EP 193 DI 10.1016/j.joi.2009.11.005 PG 9 WC Information Science & Library Science SC Information Science & Library Science GA 568II UT WOS:000275515500007 ER PT J AU Chen, ZF Guan, JC AF Chen, Zifeng Guan, Jiancheng TI The impact of small world on innovation: An empirical study of 16 countries SO JOURNAL OF INFORMETRICS LA English DT Article DE Small world networks; Innovation; Patent ID NETWORK STRUCTURE; ECONOMIC-ACTION; EMBEDDEDNESS; KNOWLEDGE; PATENTS; COLLABORATION; DETERMINANTS; CREATIVITY; DIFFUSION AB This paper investigates the impact of small world properties and the size of largest component on innovation performance at national level. Our study adds new evidence to the limited literature on this topic with an empirical investigation for the patent collaboration networks of 16 main innovative countries during 1975-2006. We combine small world network theory with statistical models to systematically explore the relationship between network structure and patent productivity. Results fail to support that the size of largest component enhances innovative productivity significantly, which is not consistent with recent concerns regarding positive effects of largest component on patent output. We do find that small-world structure benefits innovation but it is limited to a special range after which the effects inversed and shorter path length always correlates with increased innovation output. Our findings extend the current literature and they can be implicated for policy makers and relevant managers when making decisions for technology, industry and firm location. (C) 2009 Elsevier Ltd. All rights reserved. C1 [Guan, Jiancheng] Fudan Univ, Sch Management, Shanghai 200433, Peoples R China. [Chen, Zifeng] Beijing Univ Aeronaut & Astronaut, Sch Management, Beijing 100083, Peoples R China. 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Informetr. PD JAN PY 2010 VL 4 IS 1 BP 97 EP 106 DI 10.1016/j.joi.2009.09.003 PG 10 WC Information Science & Library Science SC Information Science & Library Science GA 530ZI UT WOS:000272631100011 ER PT J AU Franceschet, M AF Franceschet, Massimo TI The difference between popularity and prestige in the sciences and in the social sciences: A bibliometric analysis SO JOURNAL OF INFORMETRICS LA English DT Article DE Journal influence; Impact factor; Eigenfactor ID CITATION INFLUENCE; IMPACT; PAGERANK AB The status of a journal is commonly determined by two factors: popularity and prestige. While the former counts citations, the latter recursively weights them with the prestige of the citing journals. We make a thorough comparison of the bibliometric concepts of popularity and prestige for journals in the sciences and in the social sciences. We find that the two notions diverge more for the hard sciences, including physics, engineering, material sciences, and computer sciences, than they do for the geosciences, for biology-medical disciplines, and for the social sciences. Moreover, we identify the science and social science journals with the highest diverging ranks in popularity and prestige compilations. (C) 2009 Elsevier Ltd. All rights reserved. C1 Univ Udine, Dept Math & Comp Sci, I-33100 Udine, Italy. RP Franceschet, M (reprint author), Univ Udine, Dept Math & Comp Sci, Via Sci 206, I-33100 Udine, Italy. 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Informetr. PD JAN PY 2010 VL 4 IS 1 BP 55 EP 63 DI 10.1016/j.joi.2009.08.001 PG 9 WC Information Science & Library Science SC Information Science & Library Science GA 530ZI UT WOS:000272631100006 ER PT J AU Kiss, IZ Broom, M Craze, PG Rafols, I AF Kiss, Istvan Z. Broom, Mark Craze, Paul G. Rafols, Ismael TI Can epidemic models describe the diffusion of topics across disciplines? SO JOURNAL OF INFORMETRICS LA English DT Article DE Knowledge diffusion; Epidemic model; Science map ID SCIENCE; NETWORKS; DYNAMICS; SPREAD; TRANSMISSION; EMERGENCE; MAP AB This paper introduces a new approach to describe the spread of research topics across disciplines using epidemic models. The approach is based on applying individual-based models from mathematical epidemiology to the diffusion of a research topic over a contact network that represents knowledge flows over the map of science-as obtained from citations between ISI Subject Categories. Using research publications on the protein class kinesin as a case study, we report a better fit between model and empirical data when using the citation-based contact network. Incubation periods on the order of 4-15.5 years support the view that, whilst research topics may grow very quickly, they face difficulties to overcome disciplinary boundaries. (C) 2009 Elsevier Ltd. All rights reserved. C1 [Rafols, Ismael] Univ Sussex, SPRU Sci & Technol Policy Res, Brighton BN1 9QE, E Sussex, England. [Craze, Paul G.] Univ Sussex, Dept Biol & Environm Sci, Brighton BN1 9QG, E Sussex, England. [Kiss, Istvan Z.; Broom, Mark] Univ Sussex, Dept Math, Brighton BN1 9RF, E Sussex, England. [Rafols, Ismael] Georgia Inst Technol, Sch Publ Policy, Technol Policy & Assessment Ctr, Atlanta, GA 30332 USA. RP Rafols, I (reprint author), Univ Sussex, SPRU Sci & Technol Policy Res, Brighton BN1 9QE, E Sussex, England. EM i.rafols@sussex.ac.uk RI Rafols, Ismael/D-1509-2009; Kiss, Istvan/C-7392-2014 OI Rafols, Ismael/0000-0002-6527-7778; Kiss, Istvan/0000-0003-1473-6644 CR Anderson RM, 1991, INFECT DIS HUMANS DY, V2nd Barabasi AL, 1999, SCIENCE, V286, P509, DOI 10.1126/science.286.5439.509 Bettencourt LMA, 2008, SCIENTOMETRICS, V75, P495, DOI 10.1007/s11192-007-1888-4 Bettencourt LMA, 2006, PHYSICA A, V364, P513, DOI 10.1016/j.physa.2005.08.083 Block SM, 1998, CELL, V93, P5, DOI 10.1016/S0092-8674(00)81138-1 Bonaccorsi A, 2008, MINERVA, V46, P285, DOI 10.1007/s11024-008-9101-3 Boyack KW, 2005, SCIENTOMETRICS, V64, P351, DOI 10.1007/s11192-005-0255-6 Chen CM, 2004, SCIENTOMETRICS, V59, P199, DOI 10.1023/B:SCIE.0000018528.59913.48 DIEKMANN O, 2000, MATH EPIDEMIOLOGY IN, pCH1 Eames KTD, 2002, P NATL ACAD SCI USA, V99, P13330, DOI 10.1073/pnas.202244299 Etzkowitz H, 2000, RES POLICY, V29, P109, DOI 10.1016/S0048-7333(99)00055-4 Green DM, 2008, P R SOC B, V275, P1001, DOI 10.1098/rspb.2007.1601 Keeling MJ, 2005, J R SOC INTERFACE, V2, P295, DOI 10.1098/rsif.2005.0051 Keeling MJ, 2001, SCIENCE, V294, P813, DOI 10.1126/science.1065973 Keeling M.J., 2008, MODELLING INFECT DIS Kiss IZ, 2006, J R SOC INTERFACE, V3, P669, DOI 10.1098/rsif.2006.0129 Kiss IZ, 2006, MATH BIOSCI, V203, P124, DOI 10.1016/j.mbs.2006.03.002 Klavans R, 2009, J AM SOC INF SCI TEC, V60, P455, DOI 10.1002/asi.20991 MULKAY M, 1974, SCI STUD, V4, P205, DOI 10.1177/030631277400400301 Leydesdorff L, 2009, J AM SOC INF SCI TEC, V60, P348, DOI 10.1002/asi.20967 Moya-Anegon F., 2007, J AM SOC INFORM SCI, V58, P2167, DOI DOI 10.1002/ASI.20683 Rafols I, 2010, SCIENTOMETRICS, V82, P263, DOI 10.1007/s11192-009-0041-y Rafols I, 2009, J AM SOC INF SCI TEC, V60, P1823, DOI 10.1002/asi.21086 Rafols I, 2007, INNOVATION-ABINGDON, V20, P395, DOI 10.1080/13511610701760770 ROGERS EM, 1962, DIFFUSION INNOVATION, pCH8 Rosvall M, 2008, P NATL ACAD SCI USA, V105, P1118, DOI 10.1073/pnas.0706851105 Sharkey KJ, 2008, J MATH BIOL, V57, P311, DOI 10.1007/s00285-008-0161-7 Takeda Y, 2009, SCIENTOMETRICS, V80, P23, DOI 10.1007/s11192-007-1897-3 NR 28 TC 21 Z9 21 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 1751-1577 J9 J INFORMETR JI J. Informetr. PD JAN PY 2010 VL 4 IS 1 BP 74 EP 82 DI 10.1016/j.joi.2009.08.002 PG 9 WC Information Science & Library Science SC Information Science & Library Science GA 530ZI UT WOS:000272631100008 ER PT J AU Garfield, E AF Garfield, Eugene TI From the science of science to Scientometrics visualizing the history of science with HistCite software SO JOURNAL OF INFORMETRICS LA English DT Article; Proceedings Paper CT 11th International Conference of the International-Society-for-Scientometrics-and-Informetrics CY JUN 25-27, 2007 CL Madrid, SPAIN SP Int Soc Scientometr & Informetr, CSIC, Minist Educ & Ciencia, FECYT, Comunidad Madrid, Eugene Garfield Fdn, Thomson, Elsevier, Journal Informetr, Scopus, Ayuntamiento Madrid, Sci Metrix, Univ Carlos III Madrid DE History of Scientometrics; Etymology of Scientometrics; Derek JD Price; VV Nalimov; JD Bernal; Science of science; HistCite; Algorithmic; Historiography; Bibliometrics ID CITATION INDEXES; DIMENSION AB While ISSI was founded in 1993, Scientometrics and Bibliometrics are now at least half a century old. Indeed, the field can be traced to early quantitative studies in the early 20th century. In the 1930s, it evolved to the "science of science." The publication of J.D. Bernal's Social Function of Science in 1939 was a key transition point but the field lay dormant until after World War II, when D.J.D. Price's books Science Since Babylon and Little Science, Big Science were published in 1961 and 1963. His role as the "Father of Scientometrics" is clearly evident by using the HistCite software to visualize his impact as well as the subsequent impact of the journal Scientometrics on the growth of the field. Scientometrics owes its name to V.V. Nalimov, the author of Naukometriya, and to Tibor Braun who adapted the neologism for the journal. The primordial paper on citation indexing by Garfield which appeared in Science 1955 became a bridge between Bernal and Price. The timeline for the evolution of Scientometrics is demonstrated by a HistCite tabulation of the ranked citation index of the 100,000 references cited in the 3000 papers citing Price. (C) 2009 Elsevier Ltd. All rights reserved. C1 Thomson ISI, Philadelphia, PA 19104 USA. RP Garfield, E (reprint author), Thomson ISI, 3501 Market St, Philadelphia, PA 19104 USA. EM garfield@codex.cis.upenn.edu RI Garfield, Eugene/A-1009-2008 CR BENSMAN SJ, 2007, MULTIDIMENSIONAL W S, V3 Bernal J. D, 1939, SOCIAL FUNCTION SCI Bush V., 1945, ATLANTIC MONTHLY, V176 PRICE DJD, 1983, CC/SOC BEHAV SCI, P18 de Solla Price D. 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PD JUL PY 2009 VL 3 IS 3 BP 173 EP 179 DI 10.1016/j.joi.2009.03.009 PG 7 WC Information Science & Library Science SC Information Science & Library Science GA 459WT UT WOS:000267144200002 ER PT J AU Habibzadeh, F Yadollahie, M AF Habibzadeh, Farrokh Yadollahie, Mahboobeh TI Journal weighted impact factor: A proposal SO JOURNAL OF INFORMETRICS LA English DT Article DE journal impact factor; scientometrics; citation analysis AB The impact factor of a journal reflects the frequency with which the journal's articles are cited. It is the best available measure of journal quality. For calculation of impact factor, we just count the number of citations, no matter howprestigious the citing journal is. We think that impact factor as a measure of journal quality, may be improved if in its calculation, we not only take into account the number of citations, but also incorporate a factor reflecting the prestige of the citing journals relative to the cited journal. In calculation of this proposed "weighted impact factor," each citation has a coefficient (weight) the value of which is 1 if the citing journal is as prestigious as the cited journal; is > 1 if the citing journal is more prestigious than the cited journal; and is < 1 if the citing journal has a lower standing than the cited journal. In this way, journals receiving many citations from prestigious journals are considered prestigious themselves and those cited by low-status journals seek little credit. By considering both the number of citations and the prestige of the citing journals, we expect the weighted impact factor be a better scientometrics measure of journal quality. (C) 2008 Elsevier Ltd. All rights reserved. C1 [Habibzadeh, Farrokh; Yadollahie, Mahboobeh] Shiraz NIOC Med Environm & Res Ctr, Shiraz 71955, Iran. RP Habibzadeh, F (reprint author), Shiraz NIOC Med Environm & Res Ctr, POB 71955-575, Shiraz 71955, Iran. EM habibzaf@ams.ac.ir; habibzaf@yahoo.com CR Bollen J, 2006, SCIENTOMETRICS, V69, P669, DOI 10.1007/s11192-006-0176-z Cason H, 1936, PSYCHOL BULL, V33, P95, DOI 10.1037/h0058635 GARFIELD E, 1955, SCIENCE, V122, P108, DOI 10.1126/science.122.3159.108 Gross P L, 1927, Science, V66, P385, DOI 10.1126/science.66.1713.385 Kochen M., 1974, PRINCIPLES INFORM RE Lowy C, 1997, LANCET, V350, P1035, DOI 10.1016/S0140-6736(05)64091-3 Moed HF, 2005, CURR SCI INDIA, V89, P1990 PINSKI G, 1976, INFORM PROCESS MANAG, V12, P297, DOI 10.1016/0306-4573(76)90048-0 ROGERS I, 2006, GOOGLE PAGERANK ALGO Saha S, 2003, J MED LIBR ASSOC, V91, P42 Seglen PO, 1997, BRIT MED J, V314, P498 NR 11 TC 21 Z9 22 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 1751-1577 J9 J INFORMETR JI J. Informetr. PD APR PY 2008 VL 2 IS 2 BP 164 EP 172 DI 10.1016/j.joi.2008.02.001 PG 9 WC Information Science & Library Science SC Information Science & Library Science GA 296TK UT WOS:000255568500006 ER PT J AU Frandsen, TF AF Frandsen, Tove Faber TI Journal self-citations - Analysing the JIF mechanism SO JOURNAL OF INFORMETRICS LA English DT Article DE self citations; journal impact factor; multiple linear regression ID IMPACT FACTORS; PUBLICATION; INDICATORS; OUTPUT AB This paper investigates the mechanism of the Journal Impact Factor (JIF). Although created as a journal selection tool the indicator is probably the central quantitative indicator for measuring journal quality. The focus is journal self-citations as the treatment of these in analyses and evaluations is highly disputed. The role of self-citations (both self-citing rate and self-cited rate) is investigated on a larger scale in this analysis in order to achieve statistical reliable material that can further qualify that discussion. Some of the hypotheses concerning journal self-citations are supported by the results and some are not. (c) 2006 Elsevier Ltd. All rights reserved. C1 Royal Sch Lib & Informat Sci, Dept Informat Studies, Copenhagen S, Denmark. RP Frandsen, TF (reprint author), Royal Sch Lib & Informat Sci, Dept Informat Studies, Copenhagen S, Denmark. 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P., 1999, AM ECON, V43, P19 Van Raan AFJ, 1998, SCIENTOMETRICS, V43, P129 Van Raan AFJ, 1998, SCIENTOMETRICS, V42, P423 White HD, 2001, J AM SOC INF SCI TEC, V52, P87, DOI 10.1002/1097-4571(2000)9999:9999<::AID-ASI1542>3.3.CO;2-K WHITLEY R, 1991, 204 MANCH BUS SCH NR 39 TC 21 Z9 21 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 1751-1577 J9 J INFORMETR JI J. Informetr. PD JAN PY 2007 VL 1 IS 1 BP 47 EP 58 DI 10.1016/j.joi.2006.09.002 PG 12 WC Information Science & Library Science SC Information Science & Library Science GA 274AN UT WOS:000253974300007 ER PT J AU Kostoff, RN AF Kostoff, Ronald N. TI Comparison of China/USA science and technology performance SO JOURNAL OF INFORMETRICS LA English DT Article DE Science Citation Index; Engineering compendex; INSPEC; Databases; Peoples Republic of China; United States; Nanotechnology; Physical sciences; Environmental sciences; Engineering sciences; Life sciences ID CITATION-INDEX DATABASE; NANOTECHNOLOGY LITERATURE; SCI; INFRASTRUCTURE; JOURNALS; PHYSICS AB The relative performance of science and technology (S&T) in the USA and PRC was compared in terms of quantity and quality, as reflected in their technical literatures. Three databases (Science Citation Index (SCI), INSPEC, Ei Compendex) were selected for the quantity comparison, and citation analysis in the SCI was used for the quality comparison. Thirty technology and research areas were compared for quantity production, and are presented in this paper. These 30 areas were selected based on our previous assessment of PRC S&T output, and represented areas of emphasis by the PRC in physical, environmental, engineering, and life sciences. In almost all technical areas, the USA had the quantity (number of papers) lead (for the period 2002 - 2007) based on the SCI results, although the PRC has made dramatic strides to overtake the USA. In most of the technical areas, by 2007 PRC had attained parity with, or exceeded, the S&T literature production of the USA in the INSPEC database. The major exceptions were the biomedical field and some aspects of environmental science, where the USA still had a large lead. For most technical areas, by 2007 the PRC had even higher relative S&T literature production, based on the Ei Compendex, compared to the INSPEC results. Moreover, the USA production appears to have peaked (in the Ei Compendex) in the 2005 time frame, despite increasing amounts of funding for S&T research. The PRC challenge in non-biomedical research and technology sectors becomes apparent in those databases that do not contain substantial biomedical research papers, and therefore remove a substantial intrinsic USA advantage. For quality computations, the publication and citation results were normalized to discrete slices of time, and are presented for nanotechnology only (for the period 1998 - 2003). While the USA held a commanding lead in quality over the PRC (and the other major nanotechnology producer nations as well) during the past decade, the PRC has increased the quality of its publications monotonically, and now appears to be competitive with France, Italy, Japan, and Australia, using the quality metric in this paper. (C) 2008 Elsevier Ltd. All rights reserved. C1 Mitre Corp, Mclean, VA 22102 USA. RP Kostoff, RN (reprint author), Mitre Corp, 7515 Colshire Dr, Mclean, VA 22102 USA. EM rkostoff@mitre.org CR Bissey D, 2003, NEW J CHEM, V27, P1023, DOI 10.1039/b212662c Calero C, 2006, SCIENTOMETRICS, V66, P365, DOI 10.1007/s11192-006-0026-z Cardona M, 2005, SCIENTOMETRICS, V64, P313, DOI 10.1007/s11192-005-0253-8 Guan JC, 2007, SCIENTOMETRICS, V70, P107, DOI 10.1007/s11192-007-0107-7 He TW, 2005, SCIENTOMETRICS, V62, P249, DOI 10.1007/s11192-005-0018-4 Kademani BS, 2006, SCIENTOMETRICS, V69, P347, DOI 10.1007/s11192-006-0157-2 King DA, 2004, NATURE, V430, P311, DOI 10.1038/430311a Kostoff RN, 2006, J NANOPART RES, V8, P301, DOI 10.1007/s11051-005-9035-8 Kostoff RN, 2007, J NANOPART RES, V9, P701, DOI 10.1007/s11051-007-9224-8 Kostoff RN, 2007, TECHNOL FORECAST SOC, V74, P1539, DOI 10.1016/j.techfore.2007.02.008 Kostoff RN, 2007, CURR SCI INDIA, V93, P1088 Kostoff RN, 2007, SCIENTOMETRICS, V70, P565, DOI 10.1007/s11192-007-0303-5 Liang LM, 2003, INTERDISCIPL SCI REV, V28, P38, DOI 10.1179/030801803225010313 Moed HF, 2002, SCIENTOMETRICS, V53, P281, DOI 10.1023/A:1014812810602 Mogoutov A, 2007, RES POLICY, V36, P893, DOI 10.1016/j.respol.2007.02.005 Schummer J, 2007, SCIENTOMETRICS, V70, P669, DOI 10.1007/s11192-007-0307-1 Sigogneau A, 2000, SCIENTOMETRICS, V47, P589, DOI 10.1023/A:1005628218890 Sombatsompop N, 2007, SCIENTOMETRICS, V71, P283, DOI 10.1007/s11192-007-1667-2 Stefaniak B, 2001, SCIENTOMETRICS, V52, P193, DOI 10.1023/A:1017959605687 NR 19 TC 20 Z9 20 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 1751-1577 J9 J INFORMETR JI J. Informetr. PD OCT PY 2008 VL 2 IS 4 BP 354 EP 363 DI 10.1016/j.joi.2008.06.004 PG 10 WC Information Science & Library Science SC Information Science & Library Science GA 372LS UT WOS:000260903700011 ER PT J AU Rodriguez, MA Pepe, A AF Rodriguez, Marko A. Pepe, Alberto TI On the relationship between the structural and socioacademic communities of a coauthorship network SO JOURNAL OF INFORMETRICS LA English DT Article DE social networks; structures and organization in human complex systems; community detection; collaboration patterns ID SCIENTIFIC COLLABORATION; PATTERNS AB This article presents a study that compares detected structural communities in a coauthorship network to the socioacademic characteristics of the scholars that compose the network. The coauthorship network was created from the bibliographic record of a multi-institution, interdisciplinary research group focused on the study of sensor networks and wireless communication. Four different community detection algorithms were employed to assign a structural community to each scholar in the network: leading eigenvector, walktrap, edge betweenness and spinglass. Socioacademic characteristics were gathered from the scholars and include such information as their academic department, academic affiliation, country of origin, and academic position. A Pearson's chi(2)test, with a simulated Monte Carlo, revealed that structural communities best represent groupings of individuals working in the same academic department and at the same institution. A generalization of this result suggests that, even in interdisciplinary, multi-institutional research groups, coauthorship is primarily driven by departmental and institutional affiliation. (C) 2008 Elsevier Ltd. All rights reserved. C1 [Pepe, Alberto] Univ Calif Los Angeles, Ctr Embedded Networked Sensing, Los Angeles, CA 90024 USA. [Rodriguez, Marko A.] Los Alamos Natl Lab, Ctr Non Linear Studies, T 7, Los Alamos, NM USA. RP Pepe, A (reprint author), Univ Calif Los Angeles, Ctr Embedded Networked Sensing, Los Angeles, CA 90024 USA. 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Informetr. PD JUL PY 2008 VL 2 IS 3 BP 195 EP 201 DI 10.1016/j.joi.2008.04.002 PG 7 WC Information Science & Library Science SC Information Science & Library Science GA 327ZQ UT WOS:000257767400003 ER PT J AU Bornmann, L Leydesdorff, L Mutz, R AF Bornmann, Lutz Leydesdorff, Loet Mutz, Ruediger TI The use of percentiles and percentile rank classes in the analysis of bibliometric data: Opportunities and limits SO JOURNAL OF INFORMETRICS LA English DT Article DE Percentile; Percentile rank class; Citation impact; Reference set; Normalized citation impact ID RESEARCH PERFORMANCE; RELATIVE INDICATORS; PLOTTING POSITIONS; PUBLICATION; EXCELLENCE; CHARTS; IMPACT AB Percentiles have been established in bibliometrics as an important alternative to mean-based indicators for obtaining a normalized citation impact of publications. Percentiles have a number of advantages over standard bibliometric indicators used frequently: for example, their calculation is not based on the arithmetic mean which should not be used for skewed bibliometric data. This study describes the opportunities and limits and the advantages and disadvantages of using percentiles in bibliometrics. We also address problems in the calculation of percentiles and percentile rank classes for which there is not (yet) a satisfactory solution. It will be hard to compare the results of different percentile-based studies with each other unless it is clear that the studies were done with the same choices for percentile calculation and rank assignment. (C) 2012 Elsevier Ltd. All rights reserved. C1 [Bornmann, Lutz] Max Planck Gesell, Div Sci & Innovat Studies, D-80539 Munich, Germany. [Leydesdorff, Loet] Univ Amsterdam, ASCoR, NL-1012 CX Amsterdam, Netherlands. [Mutz, Ruediger] ETH Zurich Swiss Fed Inst Technol Zurich, CH-8001 Zurich, Switzerland. RP Bornmann, L (reprint author), Max Planck Gesell, Div Sci & Innovat Studies, Hofgartenstr 8, D-80539 Munich, Germany. EM bornmann@gv.mpg.de; loet@leydesdorff.net; mutz@gess.ethz.ch RI Mutz, Ruediger/A-2226-2009; Bornmann, Lutz/A-3926-2008; Leydesdorff, Loet/E-2903-2010 OI Bornmann, Lutz/0000-0003-0810-7091; Leydesdorff, Loet/0000-0002-7835-3098 CR Blom G, 1958, STAT ESTIMATES TRANS Bornmann L, 2011, J R STAT SOC A STAT, V174, P857, DOI 10.1111/j.1467-985X.2011.00689.x Bornmann L, 2011, J AM SOC INF SCI TEC, V62, P1954, DOI 10.1002/asi.21611 Bornmann L., J AM SOC IN IN PRESS Bornmann L, 2008, J DOC, V64, P45, DOI 10.1108/00220410810844150 Bornmann L, 2011, J INFORMETR, V5, P228, DOI 10.1016/j.joi.2010.10.009 Bornmann L, 2012, J INFORMETR, V6, P333, DOI 10.1016/j.joi.2011.11.006 Cox N. 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A comparative analysis using whole and fractionalised counting methods SO JOURNAL OF INFORMETRICS LA English DT Article DE Citation indicators; Bibliometric methods; International co-authorship ID JOURNAL IMPACT FACTOR; RELATIVE INDICATORS; BRITISH SCIENCE; COLLABORATION; PUBLICATIONS; AUTHORS; NORMALIZATION; CONSEQUENCES; DECLINE; FIELD AB This paper presents an empirical analysis of two different methodologies for calculating national citation indicators: whole counts and fractionalised counts. The aim of our study is to investigate the effect on relative citation indicators when citations to documents are fractionalised among the authoring countries. We have performed two analyses: a time series analysis of one country and a cross-sectional analysis of 23 countries. The results show that all countries' relative citation indicators are lower when fractionalised counting is used. Further, the difference between whole and fractionalised counts is generally greatest for the countries with the highest proportion of internationally co-authored articles. In our view there are strong arguments in favour of using fractionalised counts to calculate relative citation indexes at the national level, rather than using whole counts, which is the most common practice today. (C) 2011 Elsevier Ltd. All rights reserved. C1 [Aksnes, Dag W.] NIFU Nord Inst Studies Innovat Res & Educ, NO-0167 Oslo, Norway. [Schneider, Jesper W.] Royal Sch Lib & Informat Sci, DK-9220 Aalborg O, Denmark. [Gunnarsson, Magnus] Swedish Res Council, Dept Res Policy Anal, SE-10138 Stockholm, Sweden. RP Aksnes, DW (reprint author), NIFU Nord Inst Studies Innovat Res & Educ, Wergelandsveien 7, NO-0167 Oslo, Norway. EM dag.w.aksnes@nifu.no; jws@iva.dk; magnus.gunnarsson@vr.se RI Schneider, Jesper Wiborg/J-9068-2012 OI Schneider, Jesper Wiborg/0000-0001-5556-0919 CR Aksnes DW, 2003, SCIENTOMETRICS, V56, P235, DOI 10.1023/A:1021919228368 Aksnes DW, 2000, SCIENTOMETRICS, V49, P7, DOI 10.1023/A:1005653006993 Egghe L, 2000, J AM SOC INFORM SCI, V51, P145, DOI 10.1002/(SICI)1097-4571(2000)51:2<145::AID-ASI6>3.0.CO;2-9 Galam S., 2011, ARXIV10073708V2PHYSI GARFIELD E, 1979, SCIENTOMETRICS, V1, P359, DOI 10.1007/BF02019306 Gauffriau M, 2005, SCIENTOMETRICS, V64, P85, DOI 10.1007/s11192-005-0239-6 Glanzel W, 2000, SCIENTOMETRICS, V48, P121, DOI 10.1023/A:1005640604267 Gunnarsson M., 2010, USE BIBLIOMETRICS RE HARSANYI MA, 1993, LIBR INFORM SCI RES, V15, P325 HERBERTZ H, 1995, SCIENTOMETRICS, V33, P117, DOI 10.1007/BF02020777 HURT CD, 1987, INFORM PROCESS MANAG, V23, P1, DOI 10.1016/0306-4573(87)90033-1 IRVINE J, 1985, NATURE, V316, P587, DOI 10.1038/316587a0 Kronman U., 2010, BIBLIOMETRIC DATABAS Leydesdorff L, 2011, J AM SOC INF SCI TEC, V62, P217, DOI 10.1002/asi.21450 Leydesdorff L., 1988, SCI PUBL POLICY, V15, P149 Leydesdorff L, 2010, J AM SOC INF SCI TEC, V61, P2365, DOI 10.1002/asi.21371 Lundberg J, 2007, J INFORMETR, V1, P145, DOI 10.1016/j.joi.2006.09.007 MARTIN BR, 1994, SCIENTOMETRICS, V29, P27, DOI 10.1007/BF02018382 MOED HF, 1995, SCIENTOMETRICS, V33, P381, DOI 10.1007/BF02017338 Moed H.F., 2005, CITATION ANAL RES EV Narin F., 1976, EVALUATIVE BIBLIOMET National Science Board, 2010, SCI ENG IND 2010 Opthof T, 2010, J INFORMETR, V4, P423, DOI 10.1016/j.joi.2010.02.003 Persson O, 2004, SCIENTOMETRICS, V60, P421, DOI 10.1023/B:SCIE.0000034384.35498.7d Piro F., 2011, BIBLIOMETRIC INDICAT Price D. d. 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PD JAN PY 2012 VL 6 IS 1 BP 36 EP 43 DI 10.1016/j.joi.2011.08.002 PG 8 WC Information Science & Library Science SC Information Science & Library Science GA 865QL UT WOS:000298325300006 ER PT J AU Leydesdorff, L Opthof, T AF Leydesdorff, Loet Opthof, Tobias TI Remaining problems with the "New Crown Indicator" (MNCS) of the CWTS SO JOURNAL OF INFORMETRICS LA English DT Letter ID JOURNAL-CITATION-REPORTS; IMPACT FACTOR C1 [Leydesdorff, Loet] Univ Amsterdam, Amsterdam Sch Commun Res ASCoR, NL-1012 CX Amsterdam, Netherlands. [Opthof, Tobias] Univ Amsterdam, Acad Med Ctr, Heart Failure Res Ctr, Expt Cardiol Grp, NL-1105 AZ Amsterdam, Netherlands. RP Leydesdorff, L (reprint author), Univ Amsterdam, Amsterdam Sch Commun Res ASCoR, Kloveniersburgwal 48, NL-1012 CX Amsterdam, Netherlands. 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[Moed, Henk F.] Leiden Univ, NL-2300 RA Leiden, Netherlands. RP Moed, HF (reprint author), Elsevier, Amsterdam, Netherlands. EM h.moed@elsevier.com CR *AUBR EXP GROUP, 2009, EC EXP GROUP ASS U B Egghe L, 1996, J INFORM SCI, V22, P165, DOI 10.1177/016555159602200302 Glanzel W, 1999, SCIENTOMETRICS, V44, P427, DOI 10.1007/BF02458488 ILLESCAS CL, 2009, SCIENTOMETRICS, V79, P473 Kronman U., 2008, BIBLIOMETRIC HDB KAR, V1.05 MOED HF, 1995, SCIENTOMETRICS, V33, P381, DOI 10.1007/BF02017338 Opthof T, 2010, J INFORMETR, V4, P423, DOI 10.1016/j.joi.2010.02.003 *SCIMAGO RES GROUP, 2009, SCIMAGO I RANK SIR 2 van Raan AFJ, 2004, HANDBOOK OF QUANTITATIVE SCIENCE AND TECHNOLOGY RESEARCH: THE USE OF PUBLICATION AND PATENT STATISTICS IN STUDIES OF S&T SYSTEMS, P19 NR 9 TC 19 Z9 19 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 1751-1577 J9 J INFORMETR JI J. Informetr. PD JUL PY 2010 VL 4 IS 3 BP 436 EP 438 DI 10.1016/j.joi.2010.03.009 PG 3 WC Information Science & Library Science SC Information Science & Library Science GA 607YQ UT WOS:000278543600023 ER PT J AU Zhou, P Leydesdorff, L AF Zhou, Ping Leydesdorff, Loet TI Fractional counting of citations in research evaluation: A cross- and interdisciplinary assessment of the Tsinghua University in Beijing SO JOURNAL OF INFORMETRICS LA English DT Article DE Evaluation; Interdisciplinary; Department; Comparison; Citation; Fractional ID SOURCE NORMALIZED IMPACT; RESEARCH PERFORMANCE; RELATIVE INDICATORS; JOURNALS; CHARTS; INDEX; PAPER AB In the case of the scientometric evaluation of multi- or interdisciplinary units one risks to compare apples with oranges: each paper has to be assessed in comparison to an appropriate reference set. We suggest that the set of citing papers can be considered as the relevant representation of the field of impact. In order to normalize for differences in citation behavior among fields, citations can be fractionally counted proportionately to the length of the reference lists in the citing papers. This new method enables us to compare among units with different disciplinary affiliations at the paper level and also to assess the statistical significance of differences among sets. Twenty-seven departments of the Tsinghua University in Beijing are thus compared. Among them, the Department of Chinese Language and Linguistics is upgraded from the 19th to the second position in the ranking. The overall impact of 19 of the 27 departments is not significantly different at the 5% level when thus normalized for different citation potentials. (C) 2011 Elsevier Ltd. All rights reserved. C1 [Zhou, Ping] Inst Sci & Tech Informat China, Beijing, Peoples R China. [Leydesdorff, Loet] Univ Amsterdam, Amsterdam Sch Commun Res ASCoR, NL-1012 CX Amsterdam, Netherlands. RP Zhou, P (reprint author), Inst Sci & Tech Informat China, 15th Fuxing Rd, Beijing, Peoples R China. EM pzhou5544@gmail.com; loet@leydesdorff.net RI Leydesdorff, Loet/E-2903-2010; ZHOU, PING/D-7848-2011 OI Leydesdorff, Loet/0000-0002-7835-3098; ZHOU, PING/0000-0001-5471-5261 CR Anderson J., 1988, SCI PUBL POLICY, V15, P153 Ball R, 2009, SCIENTOMETRICS, V81, P381, DOI 10.1007/s11192-009-2120-5 Cronin B., 1984, CITATION PROCESS ROL Davis PM, 2008, J AM SOC INF SCI TEC, V59, P2186, DOI 10.1002/asi.20943 Franceschet M, 2010, J INFORMETR, V4, P55, DOI 10.1016/j.joi.2009.08.001 GALAM S, 2010, INTEGRATING MULTIPLE GARFIELD E, 1979, SCIENTOMETRICS, V1, P359, DOI 10.1007/BF02019306 GARFIELD E, 1982, CURR CONTENTS, P5 Gingras Y, 2011, J INFORMETR, V5, P226, DOI 10.1016/j.joi.2010.10.005 Glanzel W, 2003, SCIENTOMETRICS, V56, P357, DOI 10.1023/A:1022378804087 Glanzel W, 2009, SCIENTOMETRICS, V78, P165, DOI 10.1007/s11192-008-2109-5 Goldstone R. 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Informetr. PD JUL PY 2011 VL 5 IS 3 BP 360 EP 368 DI 10.1016/j.joi.2011.01.010 PG 9 WC Information Science & Library Science SC Information Science & Library Science GA 769QF UT WOS:000291032500004 ER PT J AU Liu, YX Rousseau, R AF Liu, Yuxian Rousseau, Ronald TI Definitions of time series in citation analysis with special attention to the h-index SO JOURNAL OF INFORMETRICS LA English DT Article DE time series; citation analysis; h-index; impact factors ID HIRSCH-INDEX; MATRIX; MODEL AB The structure of different types of time series in citation analysis is revealed, using an adapted form of the Frandsen-Rousseau notation. Special cases where this approach can be used include time series of impact factors and time series of h-indices, or h-type indices. This leads to a tool describing dynamic aspects of citation analysis. Time series of h-indices are calculated in some specific models. (C) 2008 Elsevier Ltd. All rights reserved. C1 [Liu, Yuxian] Tongji Univ Lib, Period Div, Reading Sect, Shanghai 200092, Peoples R China. [Liu, Yuxian] Univ Antwerp, IBW, B-2000 Antwerp, Belgium. [Rousseau, Ronald] KHBO Assoc KU Leuven, Dept Ind Sci & Technol, B-8400 Oostende, Belgium. [Rousseau, Ronald] Hasselt Univ, B-3590 Diepenbeek, Belgium. [Rousseau, Ronald] Katholieke Univ Leuven, Steunpunt O&O Indicatoren, B-3000 Louvain, Belgium. RP Rousseau, R (reprint author), KHBO Assoc KU Leuven, Dept Ind Sci & Technol, Zeedijk 101, B-8400 Oostende, Belgium. EM yxliu@lib.tongji.edu.cn; ronald.rousseau@khbo.be CR ANDERSON TT, 2008, SCIENTOMETRICS Burrell QL, 2007, SCIENTOMETRICS, V73, P19, DOI 10.1007/s11192-006-1774-5 Egghe L, 2006, SCIENTOMETRICS, V69, P121, DOI 10.1007/s11192-006-0143-8 Egghe L., 2008, J AM SOC INFORM SCI Epstein RJ, 2004, J INVEST MED, V52, P531 Frandsen TF, 2005, J AM SOC INF SCI TEC, V56, P58, DOI 10.1002/asi.20100 Franses P. 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PD JUL PY 2008 VL 2 IS 3 BP 202 EP 210 DI 10.1016/j.joi.2008.04.003 PG 9 WC Information Science & Library Science SC Information Science & Library Science GA 327ZQ UT WOS:000257767400004 ER PT J AU Beirlant, J Glanzel, W Carbonez, A Leemans, H AF Beirlant, Jan Glanzel, Wolfgang Carbonez, An Leemans, Herlinde TI Scoring research output using statistical quantile plotting SO JOURNAL OF INFORMETRICS LA English DT Article DE quantile plots; standardizing; normal quantile plot; Pareto quantile plot; extreme value index ID IMPACT; INDEX AB In this paper, we propose two methods for scoring scientific output based on statistical quantile plotting. First, a resealing of journal impact factors for scoring scientific output on a macro level is proposed. It is based on normal quantile plotting which allows to transform impact data over several subject categories to a standardized distribution. This can be used in comparing scientific output of larger entities such as departments working in quite different areas of research. Next, as an alternative to the Hirsch index [Hirsch, J.E. (2005). An index to quantify an individuals scientific research output. Proceedings of the National Academy of Sciences of the United States of America, 102(46), 16569-16572], the extreme value index is proposed as an indicator for assessment of the research performance of individual scientists. In case of Lotkaian-Zipf-Pareto behaviour of citation counts of an individual, the extreme value index can be interpreted as the slope in a Pareto-Zipf quantile plot. This index, in contrast to the Hirsch index, is not influenced by the number of publications but stresses the decay of the statistical tail of citation counts. It appears to be much less sensitive to the science field than the Hirsch index. (c) 2007 Elsevier Ltd. All rights reserved. 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PD JUL PY 2007 VL 1 IS 3 BP 185 EP 192 DI 10.1016/j.joi.2007.04.002 PG 8 WC Information Science & Library Science SC Information Science & Library Science GA 272BE UT WOS:000253831700002 ER PT J AU Schreiber, M Malesios, CC Psarakis, S AF Schreiber, M. Malesios, C. C. Psarakis, S. TI Exploratory factor analysis for the Hirsch index, 17 h-type variants, and some traditional bibliometric indicators SO JOURNAL OF INFORMETRICS LA English DT Article DE Citation metrics; Exploratory factor analysis; h-Index; g-Index ID MULTI-AUTHORED MANUSCRIPTS; SELF-CITATION CORRECTIONS; SCIENTIFIC IMPACT; CITED PAPERS; MONTE-CARLO; R-INDEX; PHYSICISTS; RECOVERY; OUTPUT; LEVEL AB The purpose of this article is to come up with a valid categorization and to examine the performance and properties of a wide range of h-type indices presented recently in the relevant literature. 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PD JUL PY 2012 VL 6 IS 3 BP 347 EP 358 DI 10.1016/j.joi.2012.02.001 PG 12 WC Information Science & Library Science SC Information Science & Library Science GA 937LN UT WOS:000303660100001 ER PT J AU Leydesdorff, L Rafols, I AF Leydesdorff, Loet Rafols, Ismael TI Interactive overlays: A new method for generating global journal maps from Web-of-Science data SO JOURNAL OF INFORMETRICS LA English DT Article DE Map; Journal; Overlay; VOSViewer; Gephi ID PEARSONS CORRELATION-COEFFICIENT; SCIENTIFIC JOURNALS; COMMUNITY STRUCTURE; CITATION RELATIONS; INFORMATION-THEORY; SALTONS COSINE; MAPPING CHANGE; NETWORKS; COMMUNICATION; INDICATORS AB Recent advances in methods and techniques enable us to develop interactive overlays to a global map of science based on aggregated citation relations among the 9162 journals contained in the Science Citation Index and Social Science Citation Index 2009. We first discuss the pros and cons of the various options: cited versus citing, multidimensional scaling versus spring-embedded algorithms, VOSViewer versus Gephi, and the various clustering algorithms and similarity criteria. Our approach focuses on the positions of journals in the multidimensional space spanned by the aggregated journal-journal citations. Using VOSViewer for the resulting mapping, a number of choices can be left to the user; we provide default options reflecting our preferences. Some examples are also provided; for example, the potential of using this technique to assess the interdisciplinarity of organizations and/or document sets. (C) 2011 Elsevier Ltd. All rights reserved. C1 [Leydesdorff, Loet] Univ Amsterdam, ASCoR, NL-1012 CX Amsterdam, Netherlands. [Rafols, Ismael] Univ Sussex, Freeman Ctr, SPRU Sci & Technol Policy Res, Falmer Brighton BN1 9QE, E Sussex, England. 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Informetr. PD JAN PY 2011 VL 5 IS 1 BP 48 EP 63 DI 10.1016/j.joi.2010.08.002 PG 16 WC Information Science & Library Science SC Information Science & Library Science GA 698WS UT WOS:000285626000005 ER PT J AU Bouyssou, D Marchant, T AF Bouyssou, Denis Marchant, Thierry TI Bibliometric rankings of journals based on Impact Factors: An axiomatic approach SO JOURNAL OF INFORMETRICS LA English DT Article DE Bibliometrics; Journal rankings; Impact Factor; Expected utility; Decision theory ID G-INDEX; CITATION ANALYSIS; STANDS TODAY; SCIENCE; CONSEQUENCES; HISTORY; UTILITY; RISK; TOOL AB This paper proposes an axiomatic analysis of Impact Factors when used as tools for ranking journals. This analysis draws on the similarities between the problem of comparing distribution of citations among papers and that of comparing probability distributions on consequences as commonly done in decision theory. 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PD JAN PY 2011 VL 5 IS 1 BP 75 EP 86 DI 10.1016/j.joi.2010.09.001 PG 12 WC Information Science & Library Science SC Information Science & Library Science GA 698WS UT WOS:000285626000007 ER PT J AU Norris, M Oppenheim, C AF Norris, Michael Oppenheim, Charles TI Peer review and the h-index: Two studies SO JOURNAL OF INFORMETRICS LA English DT Article DE Research Assessment Exercise; h-Index; g-Index; Anthropology; Library and Information Management; Pharmacy ID ASSESSMENT EXERCISE RATINGS; CITATION COUNTS; INFORMATION-SCIENCE; SCIENTISTS; ARCHAEOLOGY; RANKING; LIBRARY; LIS AB Research was undertaken that examined what, if any, correlation there was between the h-index and rankings by peer assessment, and what correlation there was between the 2008 UK RAE rankings and the collective h-index of submitting departments. About 100 international scholars in Library and Information Science were ranked by their peers on the quality of their work. These rankings were correlated with the h and g scores the scholars had achieved. The results showed that there was a correlation between their median rankings and the indexes. The 2008 RAE grade point averages (GPA) achieved by departments from three UoAs - Anthropology, Library and Information Management and Pharmacy were compared with each of their collective h and g index scores. Results were mixed, with a strong correlation between pharmacy departments and index scores, followed by library and information management to anthropology where negative and non-significant results were found. Taken together, the findings from the research indicate that individual ranking by peer assessment and their h-index or variants was generally good. Results for the RAE 2008 gave correlations between GPA and successive versions of the h-index which varied in strength, except for anthropology where, it is suggested detailed cited reference searches must be undertaken to maximise citation counts. (C) 2009 Charles Oppenheim. Published by Elsevier Ltd. All rights reserved. C1 [Norris, Michael; Oppenheim, Charles] Univ Loughborough, Dept Informat Sci, Loughborough LE11 3TU, Leics, England. RP Oppenheim, C (reprint author), Univ Loughborough, Dept Informat Sci, Ashby Rd, Loughborough LE11 3TU, Leics, England. 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Informetr. PD JUL PY 2010 VL 4 IS 3 BP 221 EP 232 DI 10.1016/j.joi.2009.11.001 PG 12 WC Information Science & Library Science SC Information Science & Library Science GA 607YQ UT WOS:000278543600002 ER PT J AU Franceschini, F Maisano, D AF Franceschini, Fiorenzo Maisano, Domenico TI The Hirsch spectrum: A novel tool for analyzing scientific journals SO JOURNAL OF INFORMETRICS LA English DT Article DE Hirsch index; Hirsch spectrum; Journal's (co-)authors; Citations; Bibliometrics; Quality Engineering/Quality Management journals; Journal qualimetrics ID H-INDEX; IMPACT FACTOR; BIBLIOMETRIC INDICATORS; SCIENCE; CITATIONS AB This paper introduces the Hirsch spectrum (h-spectrum) for analyzing the academic reputation of a scientific journal. h-Spectrum is a novel tool based on the Hirsch (h) index. It is easy to construct: considering a specific journal in a specific interval of time, h-spectrum is defined as the distribution representing the h-indexes associated to the authors of the journal articles. This tool allows defining a reference profile of the typical author of a journal, compare different journals within the same scientific field, and provide a rough indication of prestige/reputation of a journal in the scientific community. h-Spectrum can be associated to every journal. Ten specific journals in the Quality Engineering/Quality Management field are analyzed so as to preliminarily investigate the h-spectrum characteristics. (C) 2009 Elsevier Ltd. All rights reserved. C1 [Franceschini, Fiorenzo; Maisano, Domenico] Politecn Torino, DISPEA, I-10129 Turin, Italy. RP Franceschini, F (reprint author), Politecn Torino, DISPEA, Corso Duca Abruzzi 24, I-10129 Turin, Italy. 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TI Science indicators and science patterns in Europe SO JOURNAL OF INFORMETRICS LA English DT Article DE European science; Scientific productivity; Essential science indicators; Web of science ID BIBLIOMETRIC ANALYSIS; CITATION ANALYSIS; COUNTRIES; UNIVERSITIES; NATIONS; PERFORMANCE; HISTORY; MATTERS; IMPACT; INDEX AB In this communication we perform an analysis of European science, investigating the way countries are joined in clusters according to their similarity. An extremely clear pattern arises, suggesting that geographical and cultural factors strongly influence the scientific fabric of these countries. Although it is seen that one of the major factors behind Science in Europe is, apparently, geographical proximity, bilateral cooperation between countries cannot fully account for the respective similarity. Long-term policies, planning and investment are also visible in the results. (C) 2009 Elsevier Ltd. All rights reserved. C1 [Almeida, J. A. S.; Pais, A. A. C. 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PD APR PY 2009 VL 3 IS 2 BP 134 EP 142 DI 10.1016/j.joi.2009.01.001 PG 9 WC Information Science & Library Science SC Information Science & Library Science GA 420VM UT WOS:000264317300004 ER PT J AU Zhao, DZ Strotmann, A AF Zhao, Dangzhi Strotmann, Andreas TI Comparing all-author and first-author co-citation analyses of information science SO JOURNAL OF INFORMETRICS LA English DT Article DE author co-citation analysis; bibliometrics; information science; Scopus; citation analysis ID WEB AB Although it is generally understood that different citation counting methods can produce quite different author rankings, and although "optimal" author co-citation counting methods have been identified theoretically, studies that compare author co-citation counting methods in author co-citation analysis (ACA) studies are still rare. The present study applies strict all-author-based ACA to the Information Science (IS) field, in that all authors of all cited references in a classic IS dataset are counted, and in that even the diagonal values of the co-citation matrix are computed in their theoretically optimal form. Using Scopus instead of SSCI as the data source, we find that results from a theoretically optimal all-author ACA appear to be excellent in practice, too, although in a field like IS where co-authorship levels are relatively low, its advantages over classic first-author ACA appear considerably smaller than in the more highly collaborative ones targeted before. Nevertheless, we do find some differences between the two approaches, in that first-author ACA appears to favor theorists who presumably tend to work alone, while all-author ACA appears to paint a somewhat more recent picture of the field, and to pick out some collaborative author clusters. (C) 2008 Elsevier Ltd. All rights reserved. C1 [Zhao, Dangzhi] Univ Alberta, Sch Lib & Informat Studies, Edmonton, AB T6G 2J4, Canada. [Strotmann, Andreas] Univ Alberta, Sch Business, Edmonton, AB T6G 2R6, Canada. RP Zhao, DZ (reprint author), Univ Alberta, Sch Lib & Informat Studies, 3-20 Rutherford S, Edmonton, AB T6G 2J4, Canada. 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Informetr. PD JUL PY 2008 VL 2 IS 3 BP 229 EP 239 DI 10.1016/j.joi.2008.05.004 PG 11 WC Information Science & Library Science SC Information Science & Library Science GA 327ZQ UT WOS:000257767400007 ER PT J AU Guerrero-Bote, VP Moya-Anegon, F AF Guerrero-Bote, Vicente P. Moya-Anegon, Felix TI A further step forward in measuring journals' scientific prestige: The SJR2 indicator SO JOURNAL OF INFORMETRICS LA English DT Article DE SJR2 indicator; Academic journals; Journal prestige; Eigenvector centrality; Citation networks ID COCITATION ANALYSIS; ICEBERG HYPOTHESIS; CATEGORIES; SCOPUS; MAPS AB A new size-independent indicator of scientific journal prestige, the SJR2 indicator, is proposed. This indicator takes into account not only the prestige of the citing scientific journal but also its closeness to the cited journal using the cosine of the angle between the vectors of the two journals' cocitation profiles. To eliminate the size effect, the accumulated prestige is divided by the fraction of the journal's citable documents, thus eliminating the decreasing tendency of this type of indicator and giving meaning to the scores. Its method of computation is described, and the results of its implementation on the Scopus 2008 dataset is compared with those of an ad hoc Journal Impact Factor, JIF(3y), and SNIP, the comparison being made both overall and within specific scientific areas. All three, the SJR2 indicator, the SNIP indicator and the JIF distributions, were found to fit well to a logarithmic law. Although the three metrics were strongly correlated, there were major changes in rank. In addition, the SJR2 was distributed more equalized than the JIF by Subject Area and almost as equalized as the SNIP, and better than both at the lower level of Specific Subject Areas. The incorporation of the cosine increased the values of the flows of prestige between thematically close journals. (C) 2012 Elsevier Ltd. All rights reserved. C1 [Guerrero-Bote, Vicente P.] Univ Extremadura, Dept Informat & Commun, Scimago Grp, E-06071 Badajoz, Spain. [Moya-Anegon, Felix] CSIC, CCHS, IPP, Scimago Grp, Madrid, Spain. RP Guerrero-Bote, VP (reprint author), Univ Extremadura, Dept Informat & Commun, Scimago Grp, E-06071 Badajoz, Spain. 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Informetr. PD OCT PY 2012 VL 6 IS 4 BP 674 EP 688 DI 10.1016/j.joi.2012.07.001 PG 15 WC Information Science & Library Science SC Information Science & Library Science GA 003AY UT WOS:000308581700027 ER PT J AU Bornmann, L Waltman, L AF Bornmann, Lutz Waltman, Ludo TI The detection of "hot regions" in the geography of science-A visualization approach by using density maps SO JOURNAL OF INFORMETRICS LA English DT Article DE Density map; Geographic information system; Geographical mapping; Highly cited paper; Spatial scientometrics ID BIBLIOMETRIC INDICATORS; NETWORKS; CITIES AB Spatial scientometrics has attracted a lot of attention in the very recent past. The visualization methods (density maps) presented in this paper allow for an analysis revealing regions of excellence around the world using computer programs that are freely available. Based on Scopus and Web of Science data, field-specific and field-overlapping scientific excellence can be identified in broader regions (worldwide or for a specific continent) where high quality papers (highly cited papers or papers published in Nature or Science) were published. We used a geographic information system to produce our density maps. We also briefly discuss the use of Google Earth. (C) 2011 Elsevier Ltd. All rights reserved. C1 [Bornmann, Lutz] Max Planck Soc, D-80539 Munich, Germany. [Waltman, Ludo] Leiden Univ, Ctr Sci & Technol Studies, Leiden, Netherlands. RP Bornmann, L (reprint author), Max Planck Soc, Hofgartenstr 8, D-80539 Munich, Germany. EM bornmann@gv.mpg.de RI Bornmann, Lutz/A-3926-2008 OI Bornmann, Lutz/0000-0003-0810-7091 CR Bornmann L., 2008, ETHICS SCI ENV POLIT, V8, P93, DOI DOI 10.3354/ESEP00084 Bornmann L, 2010, PLOS ONE, V5, DOI 10.1371/journal.pone.0011344 BORNMANN L, MAP EXCELLENCE UNPUB Bornmann L, 2008, J DOC, V64, P45, DOI 10.1108/00220410810844150 BOYACK KW, 2007, ACM SIGGRAPH 2007 SK Frenken K, 2009, J INFORMETR, V3, P222, DOI 10.1016/j.joi.2009.03.005 IRIBARRENMAESTR.I, 2009, CELEBRATING SCHOLARL, P25 Leydesdorff L, 2010, J AM SOC INF SCI TEC, V61, P1622, DOI 10.1002/asi.21347 Matthiessen CW, 2010, URBAN STUD, V47, P1879, DOI 10.1177/0042098010372683 Matthiessen CW, 2002, URBAN STUD, V39, P903, DOI 10.1080/00420980220128372 National Science Board, 2010, 1001 NSB NAT SCI FDN Scott D. 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PD OCT PY 2011 VL 5 IS 4 BP 547 EP 553 DI 10.1016/j.joi.2011.04.006 PG 7 WC Information Science & Library Science SC Information Science & Library Science GA 841PI UT WOS:000296524200006 ER PT J AU Li, JA Sanderson, M Willett, P Norris, M Oppenheim, C AF Li, Jiang Sanderson, Mark Willett, Peter Norris, Michael Oppenheim, Charles TI Ranking of library and information science researchers: Comparison of data sources for correlating citation data, and expert judgments SO JOURNAL OF INFORMETRICS LA English DT Article DE Expert judgments; g-index; h-index; H-index; Library and information science; Peer review ID WEB-OF-SCIENCE; BIBLIOMETRIC INDICATORS; GOOGLE-SCHOLAR; H-INDEX; SOCIAL-SCIENCES; PEER JUDGMENT; PUBLICATIONS; SCOPUS; UNIVERSITY; PHYSICS AB This paper studies the correlations between peer review and citation indicators when evaluating research quality in library and information science (LIS). Forty-two LIS experts provided judgments on a 5-point scale of the quality of research published by 101 scholars; the median rankings resulting from these judgments were then correlated with h-, g- and H-index values computed using three different sources of citation data: Web of Science (WoS), Scopus and Google Scholar (GS). The two variants of the basic h-index correlated more strongly with peer judgment than did the h-index itself; citation data from Scopus was more strongly correlated with the expert judgments than was data from GS, which in turn was more strongly correlated than data from WoS; correlations from a carefully cleaned version of GS data were little different from those obtained using swiftly gathered GS data; the indices from the citation databases resulted in broadly similar rankings of the LIS academics; GS disadvantaged researchers in bibliometrics compared to the other two citation database while WoS disadvantaged researchers in the more technical aspects of information retrieval; and experts from the UK and other European countries rated UK academics with higher scores than did experts from the USA. (C) 2010 Elsevier Ltd. All rights reserved. C1 [Sanderson, Mark; Willett, Peter] Univ Sheffield, Dept Informat Studies, Sheffield S10 2TN, S Yorkshire, England. [Li, Jiang] Nanjing Univ, Dept Informat Management, Nanjing, Peoples R China. [Norris, Michael; Oppenheim, Charles] Univ Loughborough, Dept Informat Sci, Loughborough, Leics, England. RP Sanderson, M (reprint author), Univ Sheffield, Dept Informat Studies, Sheffield S10 2TN, S Yorkshire, England. 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Informetr. PD OCT PY 2010 VL 4 IS 4 BP 554 EP 563 DI 10.1016/j.joi.2010.06.005 PG 10 WC Information Science & Library Science SC Information Science & Library Science GA 647KA UT WOS:000281616200010 ER PT J AU Bouyssou, D Marchant, T AF Bouyssou, D. Marchant, T. TI Consistent bibliometric rankings of authors and of journals SO JOURNAL OF INFORMETRICS LA English DT Article DE Bibliometrics; Ranking of journals; Ranking of authors; Consistent rankings; Impact factor; Citations ID HIRSCH-INDEX; IMPACT; INDIVIDUALS AB Rankings of journals and rankings of scientists are usually discussed separately. We argue that a consistent approach to both rankings is desirable because both the quality of a journal and the quality of a scientist depend on the papers it/he publishes. We present a pair of consistent rankings (impact factor for the journals and total number of citations for the authors) and we provide an axiomatic characterization thereof. (C) Rankings 2010 Elsevier Ltd. All rights reserved. C1 [Marchant, T.] Univ Ghent, B-9000 Ghent, Belgium. [Bouyssou, D.] Univ Paris 09, LAMSADE, F-75775 Paris 16, France. RP Marchant, T (reprint author), Univ Ghent, Dunantlaan 1, B-9000 Ghent, Belgium. 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Informetr. PD JUL PY 2010 VL 4 IS 3 BP 365 EP 378 DI 10.1016/j.joi.2010.03.003 PG 14 WC Information Science & Library Science SC Information Science & Library Science GA 607YQ UT WOS:000278543600016 ER PT J AU Spaan, JAE AF Spaan, Jos A. E. TI The danger of pseudoscience in Informetrics SO JOURNAL OF INFORMETRICS LA English DT Letter C1 Univ Amsterdam, Acad Med Ctr, Amsterdam, Netherlands. RP Spaan, JAE (reprint author), Univ Amsterdam, Acad Med Ctr, Meibergdreef 15, Amsterdam, Netherlands. EM j.a.spaan@amc.uva.nl CR Opthof T, 2010, J INFORMETR, V4, P423, DOI 10.1016/j.joi.2010.02.003 Spaan JAE, 2009, MED BIOL ENG COMPUT, V47, P1219, DOI 10.1007/s11517-009-0546-9 van Raan AFJ, 2010, J INFORMETR, V4, P431, DOI 10.1016/j.joi.2010.03.008 NR 3 TC 16 Z9 16 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 1751-1577 J9 J INFORMETR JI J. Informetr. PD JUL PY 2010 VL 4 IS 3 BP 439 EP 440 DI 10.1016/j.joi.2010.03.010 PG 2 WC Information Science & Library Science SC Information Science & Library Science GA 607YQ UT WOS:000278543600024 ER PT J AU Borner, K Scharnhorst, A AF Borner, Katy Scharnhorst, Andrea TI Visual conceptualizations and models of science SO JOURNAL OF INFORMETRICS LA English DT Editorial Material DE Conceptualization; Models; Scientometrics; Science of Science; Sociology of science; Webometrics; Informetrics; History of science; Cultural studies of science; Statistical analysis; Mathematical modeling; Science policy; Evolution ID SCIENTOMETRICS; LITERATURES; AUTHORSHIP; CITATION AB This is the Guest Editor's introduction to the Special Issue on "Science of Science: Conceptualizations and Models of Science", Journal of Informetrics. The introduction discusses challenges towards a theoretically grounded and practically useful science of science. It provides a brief chronological review of relevant work and argues for (1) the development of common frameworks for the comparison and combination of existing approaches, theories, laws, and measurements, (2) the combination of quantitative and qualitative studies of science, and (3) the operationalization of theoretical concepts in terms of measurement and empirical evidence. Next, three visual conceptualizations of science are discussed and compared. Each of them provides a framework for the comparison and combination of existing works, means to combine quantitative and qualitative data, and helps to operationalize and communicate theoretical concepts using empirical data. Last but not least, the contributions of and interlinkages among the papers included in this issue are discussed. (C) 2009 Elsevier Ltd. All rights reserved. C1 [Borner, Katy] Indiana Univ, Sch Lib & Informat Sci, Cyberinfrastruct Network Sci Ctr, Wells Lib 021, Bloomington, IN 47405 USA. 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K., 1949, HUMAN BEHAV PRINCIPL NR 84 TC 16 Z9 16 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 1751-1577 J9 J INFORMETR JI J. Informetr. PD JUL PY 2009 VL 3 IS 3 BP 161 EP 172 DI 10.1016/j.joi.2009.03.008 PG 12 WC Information Science & Library Science SC Information Science & Library Science GA 459WT UT WOS:000267144200001 ER PT J AU Ahlgren, P Colliander, C AF Ahlgren, Per Colliander, Cristian TI Document-document similarity approaches and science mapping: Experimental comparison of five approaches SO JOURNAL OF INFORMETRICS LA English DT Article DE Citation data; Textual data; Data source combination; Cluster analysis; Science mapping ID INFORMATION; TESTS AB This paper treats document-document similarity approaches in the context of science mapping. Five approaches, involving nine methods, are compared experimentally. We compare text-based approaches, the citation-based bibliographic coupling approach, and approaches that combine text-based approaches and bibliographic coupling. Forty-three articles, published in the journal Information Retrieval, are used as test documents. We investigate how well the approaches agree with a ground truth subject classification of the test documents, when the complete linkage method is used, and under two types of similarities, first-order and second-order. The results show that it is possible to achieve a very good approximation of the classification by means of automatic grouping of articles. One text-only method and one combination method, under second-order similarities in both cases, give rise to cluster solutions that to a large extent agree with the classification. (C) 2008 Elsevier Ltd. All rights reserved. C1 [Ahlgren, Per] Stockholm Univ, Univ Lib, Dept E Resources, SE-10691 Stockholm, Sweden. [Colliander, Cristian] Jonkoping Univ, Univ Lib, SE-55111 Jonkoping, Sweden. RP Ahlgren, P (reprint author), Stockholm Univ, Univ Lib, Dept E Resources, SE-10691 Stockholm, Sweden. 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PD JAN PY 2009 VL 3 IS 1 BP 49 EP 63 DI 10.1016/j.joi.2008.11.003 PG 15 WC Information Science & Library Science SC Information Science & Library Science GA 395BI UT WOS:000262496700005 ER PT J AU Calero-Medina, C Noyons, ECM AF Calero-Medina, Clara Noyons, Ed C. M. TI Combining mapping and citation network analysis for a better understanding of the scientific development: The case of the absorptive capacity field SO JOURNAL OF INFORMETRICS LA English DT Article DE Citation network analysis; Main path analysis; Hubs and authorities; Bibliometric mapping; Main research stream ID INNOVATION; TRAJECTORIES; KNOWLEDGE AB The general aim of this paper is to show the results of a study in which we combined bibliometric mapping and citation network analysis to investigate the process of creation and transfer of knowledge through scientific publications. The novelty of this approach is the combination of both methods. In this case we analyzed the citations to a very influential paper published in 1990 that contains, for the first time, the term Absorptive Capacity. A bibliometric map identified the terms and the theories associated with the term while two techniques from the citation network analysis recognized the main papers during 15 years. As a result we identified the articles that influenced the research for some time and linked them into a research tradition that can be considered the backbone of the "Absorptive Capacity Field". (C) 2008 Elsevier Ltd. All rights reserved. C1 [Calero-Medina, Clara; Noyons, Ed C. M.] Leiden Univ, Ctr Sci & Technol Studies CWTS, NL-2333 AK Leiden, Netherlands. RP Calero-Medina, C (reprint author), Leiden Univ, Ctr Sci & Technol Studies CWTS, Wassenaarseweg 62A,POB 905, NL-2333 AK Leiden, Netherlands. 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Informetr. PD OCT PY 2008 VL 2 IS 4 BP 272 EP 279 DI 10.1016/j.joi.2008.09.005 PG 8 WC Information Science & Library Science SC Information Science & Library Science GA 372LS UT WOS:000260903700002 ER PT J AU Rousseau, R AF Rousseau, Ronald TI Woeginger's axiomatisation of the h-index and its relation to the g-index, the h((2))- index and the R-2-index SO JOURNAL OF INFORMETRICS LA English DT Article DE h-Index; g-Index; Kosmulski's h((2))-index; R-index; Axioms AB Recently Woeginger [Woeginger, G. H. (2008-a). An axiomatic characterization for the Hirsch-index. Mathematical Social Sciences. An axiomatic analysis of Egghe's g-index. Journal of Informetrics] introduced a set of axioms for scientific impact measures. These lead to a characterization of the h-index. In this note we consider a slight generalization and check which of Woeginger's axioms are satisfied by the g-index, the h((2))-index and the R-2-index. (C) 2008 Elsevier Ltd. All rights reserved. C1 [Rousseau, Ronald] KHBO, Assoc KU Leuven, B-8400 Oostende, Belgium. [Rousseau, Ronald] Zhejiang Univ, NIIM, Hangzhou, Zhejiang, Peoples R China. [Rousseau, Ronald] Katholieke Univ Leuven, Steunpunt O&O Indicatoren & Dept MSI, B-3000 Louvain, Belgium. RP Rousseau, R (reprint author), KHBO, Assoc KU Leuven, Zeedijk 101, B-8400 Oostende, Belgium. EM ronald.rousseau@khbo.be CR Egghe L, 2006, SCIENTOMETRICS, V69, P131, DOI 10.1007/s11192-006-0144-7 Hirsch JE, 2005, P NATL ACAD SCI USA, V102, P16569, DOI 10.1073/pnas.0507655102 Jin B., 2006, SCI FOCUS, V1, P8 Jin B., 2007, ISSI NEWSLETTER, V3, P6 Jin BH, 2007, CHINESE SCI BULL, V52, P855, DOI 10.1007/s11434-007-0145-9 Kosmulski M., 2006, ISSI NEWSLETTER, V2, P4 MARCHANT T, 2008, SCORE BASED BIBLIOME ROUSSEAU R, J AM SOC IN IN PRESS Woeginger GJ, 2008, MATH SOC SCI, V56, P224, DOI 10.1016/j.mathsocsci.2008.03.001 Woeginger GJ, 2008, J INFORMETR, V2, P364, DOI 10.1016/j.joi.2008.05.002 NR 10 TC 16 Z9 16 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 1751-1577 J9 J INFORMETR JI J. Informetr. PD OCT PY 2008 VL 2 IS 4 BP 335 EP 340 DI 10.1016/j.joi.2008.07.001 PG 6 WC Information Science & Library Science SC Information Science & Library Science GA 372LS UT WOS:000260903700009 ER PT J AU Albarran, P Ortuno, I Ruiz-Castillo, J AF Albarran, Pedro Ortuno, Ignacio Ruiz-Castillo, Javier TI High- and low-impact citation measures: Empirical applications SO JOURNAL OF INFORMETRICS LA English DT Article DE Research evaluation; Citation distribution; Scientific ranking; Impact indicators ID INTERNATIONAL SCIENTIFIC COLLABORATION; BIBLIOMETRIC ANALYSIS; COOPERATION; NATIONS; SCORES; SCALES AB This paper contains the first empirical applications of a novel methodology for comparing the citation distributions of research units working in the same homogeneous field. The paper considers a situation in which the world citation distribution in 22 scientific fields is partitioned into three geographical areas: the U. S., the European Union (EU), and the rest of the world (RW). Given a critical citation level (CCL), we suggest using two real valued indicators to describe the shape of each area's distribution: a high-and a low-impact measure defined over the set of articles with citations below or above the CCL. It is found that, when the CCL is fixed at the 80th percentile of the world citation distribution, the U. S. performs dramatically better than the EU and the RW according to both indicators in all scientific fields. This superiority generally increases as we move from the incidence to the intensity and the citation inequality aspects of the phenomena in question. Surprisingly, changes observed when the CCL is increased from the 80th to the 95th percentile are of a relatively small order of magnitude. Finally, it is found that international co-authorship increases the high-impact and reduces the low-impact level in the three geographical areas. This is especially the case for the EU and the RW when they cooperate with the U.S. (C) 2010 Elsevier Ltd. All rights reserved. C1 [Albarran, Pedro; Ortuno, Ignacio; Ruiz-Castillo, Javier] Univ Carlos III, Dept Econ, Getafe 28903, Spain. RP Ruiz-Castillo, J (reprint author), Univ Carlos III, Dept Econ, Madrid 128, Getafe 28903, Spain. EM jrc@eco.uc3m.es CR ALBARRAN P, 2010, 1010 U CARL 3 ALBARRAN P, 2009, J AM SOC IN IN PRESS ALBARRAN P, 2010, 1016 U CARL 3 Albarran P, 2011, J INFORMETR, V5, P48, DOI 10.1016/j.joi.2010.08.002 Albarran P, 2010, SCIENTOMETRICS, V85, P329, DOI 10.1007/s11192-010-0223-7 Anderson J., 1988, SCI PUBL POLICY, V15, P153 DEBBEAVER D, 2001, SCIENTOMETRICS, V52, P365 Egghe L, 2007, J AM SOC INF SCI TEC, V58, P777, DOI 10.1002/asi.20539 *EUR, 1997, 17639 EUR EUR COMM FOSTER J, 1984, ECONOMETRICA, V52, P761, DOI 10.2307/1913475 Foster J. 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Informetr. PD JAN PY 2011 VL 5 IS 1 BP 122 EP 145 DI 10.1016/j.joi.2010.10.001 PG 24 WC Information Science & Library Science SC Information Science & Library Science GA 698WS UT WOS:000285626000011 ER PT J AU Bornmann, L Daniel, HD AF Bornmann, Lutz Daniel, Hans-Dieter TI Extent of type I and type II errors in editorial decisions: A case study on Angewandte Chemie International Edition SO JOURNAL OF INFORMETRICS LA English DT Article DE Editorial decision; Manuscript selection process; Predictive validity; Citation counts; Type I error; Type II error ID CITATION COUNTS; IMPACT; PUBLICATION; MANUSCRIPTS; ARTICLES; JOURNALS; SCIENCE; INDEX AB Selection processes are never faultless. We investigate the predictive validity of the manuscript selection process at Angewandte Chemie International Edition (AC-IE), one of the prime chemistry journals worldwide, and conducted a citation analysis for manuscripts that were accepted by the journal or rejected but published elsewhere (n = 1817). With the bibliometric data, we were able to calculate the extent of type I and type II errors of the selection decisions. We found that the decisions regarding 15% of the manuscripts show a type I error (accepted manuscripts that did not perform as well as or worse than the average rejected manuscript). Moreover, the decisions regarding 15% of the manuscripts are affected by a type II error (rejected manuscripts that performed equal to or above the average accepted manuscript). (C) 2009 Elsevier Ltd. All rights reserved. C1 [Bornmann, Lutz] ETH, CH-8092 Zurich, Switzerland. [Daniel, Hans-Dieter] Univ Zurich, Evaluat Off, CH-8001 Zurich, Switzerland. RP Bornmann, L (reprint author), ETH, Zahringerstr 24, CH-8092 Zurich, Switzerland. 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PD OCT PY 2009 VL 3 IS 4 BP 348 EP 352 DI 10.1016/j.joi.2009.05.002 PG 5 WC Information Science & Library Science SC Information Science & Library Science GA 484VB UT WOS:000269075100009 ER PT J AU Waltman, L AF Waltman, Ludo TI An empirical analysis of the use of alphabetical authorship in scientific publishing SO JOURNAL OF INFORMETRICS LA English DT Article DE Authorship order; Alphabetical authorship; Credit assignment; Scientific publishing ID H-INDEX; MULTIPLE AUTHORSHIP; CREDIT; PUBLICATION; COLLABORATION; ALLOCATION; ECONOMICS; QUALITY; ORDER AB There are different ways in which the authors of a scientific publication can determine the order in which their names are listed. Sometimes author names are simply listed alphabetically. In other cases, authorship order is determined based on the contribution authors have made to a publication. Contribution- based authorship can facilitate proper credit assignment, for instance by giving most credits to the first author. In the case of alphabetical authorship, nothing can be inferred about the relative contribution made by the different authors of a publication. In this paper, we present an empirical analysis of the use of alphabetical authorship in scientific publishing. Our analysis covers all fields of science. We find that the use of alphabetical authorship is declining over time. In 2011, the authors of less than 4% of all publications intentionally chose to list their names alphabetically. The use of alphabetical authorship is most common in mathematics, economics (including finance), and high energy physics. Also, the use of alphabetical authorship is relatively more common in the case of publications with either a small or a large number of authors. (C) 2012 Elsevier Ltd. All rights reserved. C1 Leiden Univ, Ctr Sci & Technol Studies, NL-2300 RA Leiden, Netherlands. RP Waltman, L (reprint author), Leiden Univ, Ctr Sci & Technol Studies, NL-2300 RA Leiden, Netherlands. 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We combine two datasets on a large sample of European higher education institutions (HEIs) containing information on inter-university web links, and organizational characteristics, respectively. Descriptive and inferential analyses provide strong support for our hypotheses: we identify factors predicting the connectivity between HEIs, and the number of web links existing between them. We conclude that, while the presence of a web link cannot be directly related to its underlying motivation and the type of relationship between HEIs, patterns of network ties between HEIs present interesting statistical properties which reveal new insights on the function and structure of the inter organizational networks in which HEIs are embedded. (C) 2012 Elsevier Ltd. All rights reserved. C1 [Seeber, Marco; Lepori, Benedetto; Lomi, Alessandro] Univ Lugano, Ctr Org Res, CH-6900 Lugano, Switzerland. [Aguillo, Isidro] CSIC, Cybermetr Lab, Madrid, Spain. 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PD JUL PY 2012 VL 6 IS 3 BP 435 EP 447 DI 10.1016/j.joi.2012.03.001 PG 13 WC Information Science & Library Science SC Information Science & Library Science GA 937LN UT WOS:000303660100010 ER PT J AU Zhang, L Thijs, B Glanzel, W AF Zhang, Lin Thijs, Bart Glaenzel, Wolfgang TI The diffusion of H-related literature SO JOURNAL OF INFORMETRICS LA English DT Article DE H-index; Knowledge diffusion; Clustering analysis; Core-documents ID DEPENDENT LOTKAIAN INFORMETRICS; SELF-CITATION CORRECTIONS; WEB-OF-SCIENCE; EGGHES G-INDEX; HIRSCH-INDEX; GOOGLE SCHOLAR; BIBLIOMETRIC INDICATORS; RESEARCH PRODUCTIVITY; RESEARCH PERFORMANCE; ACADEMIC JOURNALS AB In the present study we attempt to trace the diffusion of h-related literature over a five-year period beginning with the introduction of the h-index. The study is based on a reliable and representative publication set of 755 papers retrieved from the Web of Science database using keywords and citation links. 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Informetr. PD OCT PY 2011 VL 5 IS 4 BP 583 EP 593 DI 10.1016/j.joi.2011.05.004 PG 11 WC Information Science & Library Science SC Information Science & Library Science GA 841PI UT WOS:000296524200010 ER PT J AU Lariviere, V Gingras, Y AF Lariviere, Vincent Gingras, Yves TI Averages of ratios vs. ratios of averages: An empirical analysis of four levels of aggregation SO JOURNAL OF INFORMETRICS LA English DT Article DE Citations; Research evaluation; Normalization ID IMPACT INDICATORS; CITATION IMPACT; CROWN INDICATOR; PUBLICATION AB In the recent debate on the use of averages of ratios (AoR) and ratios of averages (RoA) for the compilation of field-normalized citation rates, little evidence has been provided on the different results obtained by the two methods at various levels of aggregation. This paper provides such an empirical analysis at the level of individual researchers, departments, institutions and countries. Two datasets are used: 147,547 papers published between 2000 and 2008 and assigned to 14,379 Canadian university professors affiliated to 508 departments, and all papers indexed in the Web of Science for the same period (N = 8,221,926) assigned to all countries and institutions. Although there is a strong relationship between the two measures at each of these levels, a pairwise comparison of AoR and RoA shows that the differences between all the distributions are statistically significant and, thus, that the two methods are not equivalent and do not give the same results. Moreover, the difference between both measures is strongly influenced by the number of papers published as well as by their impact scores: the difference between AoR and RoA is greater for departments, institutions and countries with low RoA scores. Finally, our results show that RoA relative impact indicators do not add up to unity (as they should by definition) at the level of the reference dataset, whereas the AoR does have that property. (C) 2011 Elsevier Ltd. All rights reserved. C1 [Lariviere, Vincent; Gingras, Yves] Univ Quebec, Observ Sci & Technol OST, Ctr Interuniv Rech Sci & Technol CIRST, Montreal, PQ H3C 3P8, Canada. [Lariviere, Vincent] Indiana Univ, Cyberinfrastruct Network Sci Ctr, Sch Lib & Informat Sci, Bloomington, IN 47405 USA. RP Lariviere, V (reprint author), Univ Quebec, Observ Sci & Technol OST, Ctr Interuniv Rech Sci & Technol CIRST, CP 8888,Succ Ctr Ville, Montreal, PQ H3C 3P8, Canada. EM lariviere.vincent@uqam.ca; gingras.yves@uqam.ca CR Corder G. 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The visual mapping structures by co-occurrence analyses show that nanobiopharm-research is currently focused on the drug development for improving biodistribution, bioavailability and pharmacokinetics, and the drug delivery for improving delivery of existing drugs. Some pivot publications is identified by CiteSpace, which work as structural holes, research fronts and intellectual bases for the nanobiopharm-research development in the given time window. (C) 2010 Elsevier Ltd. All rights reserved. C1 [Guan, Jiancheng] Fudan Univ, Sch Management, Shanghai 200433, Peoples R China. [Chen, Kaihua] Chinese Acad Sci, Inst Policy & Management, Beijing 100090, Peoples R China. RP Guan, JC (reprint author), Fudan Univ, Sch Management, Shanghai 200433, Peoples R China. 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Informetr. PD APR PY 2011 VL 5 IS 2 BP 233 EP 247 DI 10.1016/j.joi.2010.10.007 PG 15 WC Information Science & Library Science SC Information Science & Library Science GA 732AV UT WOS:000288154700001 ER PT J AU Vanclay, JK AF Vanclay, Jerome K. TI An evaluation of the Australian Research Council's journal ranking SO JOURNAL OF INFORMETRICS LA English DT Article DE Excellence in Research for Australia (ERA); Bibliometrics; Research evaluation ID H-INDEX; SCIENTIFIC-RESEARCH; GOOGLE SCHOLAR; PUBLICATION; QUALITY; IMPACT; INDICATORS; ECONOMICS; SCOPUS AB As part of its program of 'Excellence in Research for Australia' (ERA), the Australian Research Council ranked journals into four categories (A*, A, B, and C) in preparation for their performance evaluation of Australian universities. The ranking is important because it likely to have a major impact on publication choices and research dissemination in Australia. The ranking is problematic because it is evident that some disciplines have been treated very differently than others. This paper reveals weaknesses in the ERA journal ranking and highlights the poor correlation between ERA rankings and other acknowledged metrics of journal standing. It highlights the need for a reasonable representation of journals ranked as A* in each scientific discipline. (C) 2010 Elsevier Ltd. All rights reserved. C1 So Cross Univ, Sch Environm Sci & Management, Lismore, NSW 2480, Australia. RP Vanclay, JK (reprint author), So Cross Univ, Sch Environm Sci & Management, POB 157, Lismore, NSW 2480, Australia. 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PD APR PY 2011 VL 5 IS 2 BP 265 EP 274 DI 10.1016/j.joi.2010.12.001 PG 10 WC Information Science & Library Science SC Information Science & Library Science GA 732AV UT WOS:000288154700003 ER PT J AU Franceschini, F Maisano, D AF Franceschini, Fiorenzo Maisano, Domenico TI Structured evaluation of the scientific output of academic research groups by recent h-based indicators SO JOURNAL OF INFORMETRICS LA English DT Article DE Bibliometric positioning; h-Index; h-Spectrum; Successive h-indices; Ch-index; Research evaluation; Academic research group; Scientific production ID BIBLIOMETRIC INDICATORS; HIRSCH-INDEX; RANKING; INSTITUTIONS; PERFORMANCE; UNIVERSITIES AB Evaluating the scientific output of researchers, research institutions, academic departments and even universities is a challenging issue. To do this, bibliometric indicators are helpful tools, more and more familiar to research and governmental institutions. This paper proposes a structured method to compare academic research groups within the same discipline, by means of some Hirsch (h) based bibliometric indicators. Precisely, five different typologies of indicators are used so as to depict groups' bibliometric positioning within the scientific community. A specific analysis concerning the Italian researchers in the scientific sector of Production Technology and Manufacturing Systems is developed. The analysis is supported by empirical data and can be extended to research groups associated to other scientific sectors. (C) 2010 Elsevier Ltd. All rights reserved. C1 [Franceschini, Fiorenzo; Maisano, Domenico] Politecn Torino, DISPEA, I-10129 Turin, Italy. RP Franceschini, F (reprint author), Politecn Torino, DISPEA, Corso Duca Abruzzi 24, I-10129 Turin, Italy. 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Informetr. PD JAN PY 2011 VL 5 IS 1 BP 64 EP 74 DI 10.1016/j.joi.2010.08.003 PG 11 WC Information Science & Library Science SC Information Science & Library Science GA 698WS UT WOS:000285626000006 ER PT J AU Vaughan, L You, J AF Vaughan, Liwen You, Justin TI Word co-occurrences on Webpages as a measure of the relatedness of organizations: A new Webometrics concept SO JOURNAL OF INFORMETRICS LA English DT Article DE Web co-link analysis; Web co-word analysis; Webometrics; Competitive intelligence ID INFORMATION-SCIENCE; SEARCH ENGINES; WEB; INTELLIGENCE AB Web hyperlink analysis has been a key topic of Webometric research. However, inlink data collection from commercial search engines has been limited to only one source in recent years, which is not a promising prospect for the future development of the field. We need to tap into other Web data sources and to develop new methods. Toward this end, we propose a new Webometrics concept that is based on words rather than inlinks on Webpages. We propose that word co-occurrences on Webpages can be a measure of the relatedness of organizations. Word co-occurrence data can be collected from both general search engines and blog search engines, which expands data sources greatly. The proposed concept is tested in a group of companies in the LTE and WiMax sectors of the telecommunications industry. Data on the co-occurrences of company names on Webpages were collected from Google and Google Blog. The co-occurrence matrices were analyzed using MDS. The resulting MDS maps were compared with industry reality and with the MDS maps from co-link analysis. Results show that Web co-word analysis could potentially be as useful as Web co-link analysis. Google Blog seems to be a better source than Google for co-word data collection. (C) 2010 Elsevier Ltd. All rights reserved. C1 [Vaughan, Liwen] Univ Western Ontario, Fac Informat & Media Studies, London, ON N6A 5B7, Canada. [You, Justin] ApacBridge Consulting, Ottawa, ON K2G 6C7, Canada. RP Vaughan, L (reprint author), Univ Western Ontario, Fac Informat & Media Studies, London, ON N6A 5B7, Canada. EM lvaughan@uwo.ca; justin.you@apacbridge.com CR Adar E., 2007, P 16 INT C WORLD WID, P161, DOI 10.1145/1242572.1242595 Almind TC, 1997, J DOC, V53, P404, DOI 10.1108/EUM0000000007205 Bar-Ilan J, 2004, ANNU REV INFORM SCI, V38, P231, DOI 10.1002/aris.1440380106 Bar-Ilan J., 2005, CYBERMETRICS, V9 Bar-Ilan Judit, 2007, INFORM RES, V12 Campbell D. 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Informetr. PD OCT PY 2010 VL 4 IS 4 BP 483 EP 491 DI 10.1016/j.joi.2010.04.005 PG 9 WC Information Science & Library Science SC Information Science & Library Science GA 647KA UT WOS:000281616200004 ER PT J AU Wong, CY Goh, KL AF Wong, Chan-Yuan Goh, Kim-Leng TI Growth behavior of publications and patents: A comparative study on selected Asian economies SO JOURNAL OF INFORMETRICS LA English DT Article DE Diffusion of science and technology; Logistic growth function; Self-propagating behavior ID SCIENCE-AND-TECHNOLOGY; FORECASTING EMERGING TECHNOLOGIES; FUNCTIONALITY DEVELOPMENT; INNOVATION SYSTEMS; MODEL SELECTION; PERFORMANCE; INDICATORS; DIFFUSION; MARKET; CHINA AB This study attempts to model the growth behavior of the number of publications and patents of South Korea, Taiwan, Japan and Malaysia. Three competing growth functions, namely, simple logistic growth function, bi-logistic growth function and logistic function within a dynamic carrying capacity were considered. The findings provide insight to the diffusion process of science and technology, often measured by the number of publications and patents, respectively. The function that provides the best fit to the observed data was opted for explaining the diffusion process. The function with the best fit is the bi-logistic growth function for the number of publications as well as the number of patents of South Korea and Taiwan, the logistic growth function within a dynamic carrying capacity (LGDCC) for the number of publications and the bi-logistic growth function for the number of patents of Japan, and the LGDCC for the number of publications and simple growth function for the number of patents of Malaysia. The results suggest a dynamic self-propagating growth for the science and technology, and thereby a transition from science and technology-push to market-pull growth for South Korea and Taiwan. While a similar transition was observed for the technology of Japan, the growth in science had entered a maturity stage. On the other hand, the growth potential in science is dynamic for Malaysia, but its technological advancement is relatively lower and static compared to the other economies. (C) 2010 Elsevier Ltd. All rights reserved. C1 [Wong, Chan-Yuan] Univ Malaya, Fac Sci, Dept Sci & Technol Studies, Kuala Lumpur 50603, Malaysia. [Goh, Kim-Leng] Univ Malaya, Fac Econ & Adm, Kuala Lumpur 50603, Malaysia. RP Wong, CY (reprint author), Univ Malaya, Fac Sci, Dept Sci & Technol Studies, Kuala Lumpur 50603, Malaysia. 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Even though the correlations between all the ranked lists are very high, there are considerable individual differences between the rankings as can be seen by visual inspection, showing that the correlation measure is not sensitive enough. Thus we also compute other measures, Spearman's footrule and the M-measure that are more sensitive to the differences between the rankings in the sense that the range of values is larger than the range of correlation values when comparing the JIF ranking to the rankings induced by the h-type indices. (C) 2009 Elsevier Ltd. All rights reserved. C1 Bar Ilan Univ, Dept Informat Sci, IL-52900 Ramat Gan, Israel. RP Bar-Ilan, J (reprint author), Bar Ilan Univ, Dept Informat Sci, IL-52900 Ramat Gan, Israel. EM barilaj@mail.biu.ac.il RI Bar-Ilan, Judit/B-3452-2009 OI Bar-Ilan, Judit/0000-0002-8796-5248 CR AGUILLO IF, 2009, P 12 INT C INF SCIEN Bar-Ilan J, 2007, J INFORMETR, V1, P26, DOI 10.1016/j.joi.2006.08.001 Bornmann L, 2009, EUR J ORG CHEM, P1471, DOI 10.1002/ejoc.200801243 Braun T, 2005, SCIENTIST, V19, P8 Braun T, 2006, SCIENTOMETRICS, V69, P169, DOI 10.1007/s11192-006-0147-4 DIACONIS P, 1977, J ROY STAT SOC B MET, V39, P262 Egghe L, 2006, SCIENTOMETRICS, V69, P131, DOI 10.1007/s11192-006-0144-7 Garfield E, 2006, JAMA-J AM MED ASSOC, V295, P90, DOI 10.1001/jama.295.1.90 GARFIELD E, 1955, SCIENCE, V122, P108, DOI 10.1126/science.122.3159.108 GLANZEL W, 2007, J INFORM, V1, P179 Glanzel W, 2004, SCIENTOMETRICS, V60, P511, DOI 10.1023/B:SCIE.0000034391.06240.2a Guns R, 2009, J INFORMETR, V3, P64, DOI 10.1016/j.joi.2008.11.004 Harzing AW, 2009, J AM SOC INF SCI TEC, V60, P41, DOI 10.1002/asi.20953 Hirsch JE, 2005, P NATL ACAD SCI USA, V102, P16569, DOI 10.1073/pnas.0507655102 INGWERSEN P, 2000, WEB KNOWLEDGE FESTSC, P373 LIANG L, 2009, P 12 INT C INF SCIEN MOED HF, 1995, J AM SOC INFORM SCI, V46, P461, DOI 10.1002/(SICI)1097-4571(199507)46:6<461::AID-ASI5>3.0.CO;2-G PENDELBURY D, 2008, THOMSON SCI CORRECTS Rossner M, 2007, J CELL BIOL, V179, P1091, DOI 10.1083/jcb.200711140 Seglen PO, 1997, BRIT MED J, V314, P497, DOI DOI 10.1136/BMJ.314.7079.497 Ruane F, 2008, SCIENTOMETRICS, V75, P395, DOI 10.1007/s11192-007-1869-7 NR 21 TC 14 Z9 14 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 1751-1577 J9 J INFORMETR JI J. Informetr. PD APR PY 2010 VL 4 IS 2 BP 141 EP 147 DI 10.1016/j.joi.2009.11.006 PG 7 WC Information Science & Library Science SC Information Science & Library Science GA 568II UT WOS:000275515500002 ER PT J AU Lambiotte, R Ausloos, M Thelwall, A AF Lambiotte, R. Ausloos, M. Thelwall, A. TI Word statistics in Blogs and RSS feeds: Towards empirical universal evidence SO JOURNAL OF INFORMETRICS LA English DT Article DE time statistics; information networks; zipf law; activity pattern ID POWER-LAW; DISTRIBUTIONS; NETWORK AB We focus on the statistics of word occurrences and of the waiting times between such occurrences in Blogs. Due to the heterogeneity of words' frequencies, the empirical analysis is performed by studying classes of "frequently-equivalent" words, i.e. by grouping words depending on their frequencies. Two limiting cases are considered: the dilute limit, i.e. for those words that are used less than once a day, and the dense limit for frequent words. In both cases, extreme events occur more frequently than expected from the Poisson hypothesis. These deviations from Poisson statistics reveal non-trivial time correlations between events that are associated with bursts of activities. The distribution of waiting times is shown to behave like a stretched exponential and to have the same shape for different sets of words sharing a common frequency, thereby revealing universal features. (c) 2007 Elsevier Ltd. All rights reserved. C1 [Lambiotte, R.; Ausloos, M.] Univ Liege, GRAPES, B-4000 Liege, Belgium. [Thelwall, A.] Wolverhampton Univ, SCIT, Wolverhampton WV1 1SB, W Midlands, England. RP Lambiotte, R (reprint author), Univ Liege, GRAPES, B5 Sart Tilman, B-4000 Liege, Belgium. 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Informetr. PY 2007 VL 1 IS 4 BP 277 EP 286 DI 10.1016/j.joi.2007.07.001 PG 10 WC Information Science & Library Science SC Information Science & Library Science GA 272BF UT WOS:000253831900003 ER PT J AU Bornmann, L Leydesdorff, L AF Bornmann, Lutz Leydesdorff, Loet TI The validation of (advanced) bibliometric indicators through peer assessments: A comparative study using data from InCites and F1000 SO JOURNAL OF INFORMETRICS LA English DT Article DE Advanced bibliometric indicators; Peer review; F1000; InCites ID PUBLICATION; IMPACT; QUALITY AB The data of F1000 and InCites provide us with the unique opportunity to investigate the relationship between peers' ratings and bibliometric metrics on a broad and comprehensive data set with high-quality ratings. F1000 is a post-publication peer review system of the biomedical literature. The comparison of metrics with peer evaluation has been widely acknowledged as a way of validating metrics. Based on the seven indicators offered by InCites, we analyzed the validity of raw citation counts (Times Cited, 2nd Generation Citations, and 2nd Generation Citations per Citing Document), normalized indicators (journal Actual/Expected Citations, Category Actual/Expected Citations, and Percentile in Subject Area), and a journal based indicator (Journal Impact Factor). The data set consists of 125 papers published in 2008 and belonging to the subject category cell biology or immunology. As the results show, Percentile in Subject Area achieves the highest correlation with F1000 ratings; we can assert that for further three other indicators (Times Cited, 2nd Generation Citations, and Category Actual/Expected Citations) the "true" correlation with the ratings reaches at least a medium effect size. (c) 2012 Elsevier Ltd. All rights reserved. C1 [Bornmann, Lutz] Adm Headquarters Max Planck Soc, Div Sci & Innovat Studies, D-80539 Munich, Germany. [Leydesdorff, Loet] Univ Amsterdam, Amsterdam Sch Commun Res ASCoR, NL-1012 CX Amsterdam, Netherlands. RP Bornmann, L (reprint author), Adm Headquarters Max Planck Soc, Div Sci & Innovat Studies, Hofgartenstr 8, D-80539 Munich, Germany. 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TI Caveats for using statistical significance tests in research assessments SO JOURNAL OF INFORMETRICS LA English DT Review DE Statistical significance tests; Problems and misuse; Research assessment ID CITATION IMPACT; BIBLIOMETRIC INDICATORS; PSYCHOLOGICAL RESEARCH; APPARENT POPULATIONS; CROWN INDICATOR; INFERENCE; SCIENCE; DEBATE; CONTROVERSY; JOURNALS AB This article raises concerns about the advantages of using statistical significance tests in research assessments as has recently been suggested in the debate about proper normalization procedures for citation indicators by Opthof and Leydesdorff (2010). Statistical significance tests are highly controversial and numerous criticisms have been leveled against their use. Based on examples from articles by proponents of the use statistical significance tests in research assessments, we address some of the numerous problems with such tests. The issues specifically discussed are the ritual practice of such tests, their dichotomous application in decision making, the difference between statistical and substantive significance, the implausibility of most null hypotheses, the crucial assumption of randomness, as well as the utility of standard errors and confidence intervals for inferential purposes. We argue that applying statistical significance tests and mechanically adhering to their results are highly problematic and detrimental to critical thinking. We claim that the use of such tests do not provide any advantages in relation to deciding whether differences between citation indicators are important or not. On the contrary their use may be harmful. Like many other critics, we generally believe that statistical significance tests are over- and misused in the empirical sciences including scientometrics and we encourage a reform on these matters. (C) 2012 Elsevier Ltd. All rights reserved. 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PD JAN PY 2013 VL 7 IS 1 BP 50 EP 62 DI 10.1016/j.joi.2012.08.005 PG 13 WC Information Science & Library Science SC Information Science & Library Science GA 065BG UT WOS:000313121300005 ER PT J AU Yan, E Ding, Y Milojevic, S Sugimoto, CR AF Yan, Erjia Ding, Ying Milojevic, Stasa Sugimoto, Cassidy R. TI Topics in dynamic research communities: An exploratory study for the field of information retrieval SO JOURNAL OF INFORMETRICS LA English DT Article DE Community; Knowledge discovery; Coauthorship; Network; Latent Dirichlet Allocation ID SCIENCE-AND-TECHNOLOGY; COCITATION ANALYSIS; COLLABORATION; NETWORKS; EVOLUTION; CITATION AB Research topics and research communities are not disconnected from each other: communities and topics are interwoven and co-evolving. Yet, scientometric evaluations of topics and communities have been conducted independently and synchronically, with researchers often relying on homogeneous unit of analysis, such as authors, journals, institutions, or topics. Therefore, new methods are warranted that examine the dynamic relationship between topics and communities. This paper examines how research topics are mixed and matched in evolving research communities by using a hybrid approach which integrates both topic identification and community detection techniques. Using a data set on information retrieval (IR) publications, two layers of enriched information are constructed and contrasted: one is the communities detected through the topology of coauthorship network and the other is the topics of the communities detected through the topic model. We find evidence to support the assumption that IR communities and topics are interwoven and co-evolving, and topics can be used to understand the dynamics of community structures. We recommend the use of the hybrid approach to study the dynamic interactions of topics and communities. (C) 2011 Elsevier Ltd. All rights reserved. C1 [Yan, Erjia; Ding, Ying; Milojevic, Stasa; Sugimoto, Cassidy R.] Indiana Univ, Sch Lib & Informat Sci, Bloomington, IN 47405 USA. RP Yan, E (reprint author), Indiana Univ, Sch Lib & Informat Sci, 1320 E 10th St,LI011, Bloomington, IN 47405 USA. 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PD JAN PY 2012 VL 6 IS 1 BP 140 EP 153 DI 10.1016/j.joi.2011.10.001 PG 14 WC Information Science & Library Science SC Information Science & Library Science GA 865QL UT WOS:000298325300017 ER PT J AU Serenko, A Dohan, M AF Serenko, Alexander Dohan, Michael TI Comparing the expert survey and citation impact journal ranking methods: Example from the field of Artificial Intelligence SO JOURNAL OF INFORMETRICS LA English DT Article DE Artificial Intelligence; Journal ranking; Academic journal; Google Scholar; Survey; Citation impact; H-index; G-index; Hc-index ID SCIENTIFIC JOURNALS; MANAGEMENT JOURNALS; EVALUATING RESEARCH; GLOBAL PERCEPTIONS; ACADEMIC JOURNALS; H-INDEX; QUALITY; BUSINESS; PEER; SCIENCE AB The purpose of this study is to: (1) develop a ranking of peer-reviewed AI journals; (2) compare the consistency of journal rankings developed with two dominant ranking techniques, expert surveys and journal impact measures; and (3) investigate the consistency of journal ranking scores assigned by different categories of expert judges. The ranking was constructed based on the survey of 873 active AI researchers who ranked the overall quality of 182 peer-reviewed AI journals. It is concluded that expert surveys and citation impact journal ranking methods cannot be used as substitutes. Instead, they should be used as complementary approaches. The key problem of the expert survey ranking technique is that in their ranking decisions, respondents are strongly influenced by their current research interests. As a result, their scores merely reflect their present research preferences rather than an objective assessment of each journal's quality. In addition, the application of the expert survey method favors journals that publish more articles per year. (C) 2011 Elsevier Ltd. All rights reserved. C1 [Serenko, Alexander] Lakehead Univ, Fac Business Adm, Thunder Bay, ON P7B 5E1, Canada. [Dohan, Michael] McMaster Univ, DeGroote Sch Business, Hamilton, ON L8S 4M4, Canada. RP Serenko, A (reprint author), Lakehead Univ, Fac Business Adm, 955 Oliver Rd, Thunder Bay, ON P7B 5E1, Canada. 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Informetr. PD OCT PY 2011 VL 5 IS 4 BP 629 EP 648 DI 10.1016/j.joi.2011.06.002 PG 20 WC Information Science & Library Science SC Information Science & Library Science GA 841PI UT WOS:000296524200014 ER PT J AU Kosmulski, M AF Kosmulski, Marek TI Successful papers: A new idea in evaluation of scientific output SO JOURNAL OF INFORMETRICS LA English DT Article DE Citation metrics; Scientific output; References; Bias ID H-INDEX AB A paper which has received more citations than the number of references in that paper is called a successful paper (SP). The assessment based on the number of SP produces comparable scores for scientists working in different disciplines of science, and in different countries. (C) 2011 Elsevier Ltd. All rights reserved. C1 Lublin Univ Technol, PL-20618 Lublin, Poland. RP Kosmulski, M (reprint author), Lublin Univ Technol, Nadbystrzycka 38, PL-20618 Lublin, Poland. EM mkosmuls@abo.fi RI Kosmulski, Marek/B-9158-2009; Kosmulski, Marek/F-2326-2010 CR Bornmann L, 2011, ANNU REV INFORM SCI, V45, P199 Egghe L, 2010, ANNU REV INFORM SCI, V44, P65 Egghe L, 2008, J AM SOC INF SCI TEC, V59, P1608, DOI 10.1002/asi.20845 GLANZEL W, 1994, SCIENTOMETRICS, V30, P49, DOI 10.1007/BF02017212 Hirsch JE, 2005, P NATL ACAD SCI USA, V102, P16569, DOI 10.1073/pnas.0507655102 Kosmulski M, 2009, J INFORMETR, V3, P341, DOI 10.1016/j.joi.2009.05.003 Liang LM, 2008, J DOC, V64, P229, DOI 10.1108/00220410810858038 Moed HF, 2010, J INFORMETR, V4, P265, DOI 10.1016/j.joi.2010.01.002 PINSKI G, 1976, INFORM PROCESS MANAG, V12, P297, DOI 10.1016/0306-4573(76)90048-0 Schreiber M, 2008, J INFORMETR, V2, P211, DOI 10.1016/j.joi.2008.05.001 Webster GD, 2009, EVOL PSYCHOL, V7, P348 YANOVSKY VI, 1981, SCIENTOMETRICS, V3, P223, DOI 10.1007/BF02101667 Zitt M, 2008, J AM SOC INF SCI TEC, V59, P1856, DOI 10.1002/asi.20880 Zitt M, 2010, J INFORMETR, V4, P392, DOI 10.1016/j.joi.2010.03.004 NR 14 TC 13 Z9 13 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 1751-1577 J9 J INFORMETR JI J. Informetr. PD JUL PY 2011 VL 5 IS 3 BP 481 EP 485 DI 10.1016/j.joi.2011.03.001 PG 5 WC Information Science & Library Science SC Information Science & Library Science GA 769QF UT WOS:000291032500017 ER PT J AU Frandsen, TF Nicolaisen, J AF Frandsen, Tove Faber Nicolaisen, Jeppe TI What is in a name? Credit assignment practices in different disciplines SO JOURNAL OF INFORMETRICS LA English DT Article DE Credit assignment; Alphabetization; Authorship; Multi-authorship; Bibliometrics ID CORE JOURNALS; AUTHOR ORDER; SCIENTIFIC COLLABORATION; SCHOLARLY COMMUNICATION; ECONOMICS JOURNALS; MEDICAL JOURNALS; ARTICLES; SCIENCE; PUBLICATIONS; HYPERAUTHORSHIP AB The paper reviews the literature on disciplinary credit assignment practices, and presents the results of a longitudinal study of credit assignment practices in the fields of economics, high energy physics, and information science. The practice of alphabetization of authorship is demonstrated to vary significantly between the fields. A slight increase is found to have taken place in economics during the last 30 years (1978-2007). A substantial decrease is found to have taken place in information science during the same period. High energy physics is found to be characterised by a high and stable share of alphabetized multi-authorships during the investigated period (1990-2007). It is important to be aware of such disciplinary differences when conducting bibliometric analyses. (C) 2010 Elsevier Ltd. All rights reserved. C1 [Frandsen, Tove Faber] Univ So Denmark, DK-5230 Odense M, Denmark. [Nicolaisen, Jeppe] Royal Sch Lib & Informat Sci, DK-2300 Copenhagen S, Denmark. RP Frandsen, TF (reprint author), Univ So Denmark, Campusvej 55, DK-5230 Odense M, Denmark. 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Informetr. PD OCT PY 2010 VL 4 IS 4 BP 608 EP 617 DI 10.1016/j.joi.2010.06.010 PG 10 WC Information Science & Library Science SC Information Science & Library Science GA 647KA UT WOS:000281616200015 ER PT J AU Serenko, A AF Serenko, Alexander TI The development of an AI journal ranking based on the revealed preference approach SO JOURNAL OF INFORMETRICS LA English DT Article DE Artificial intelligence; Journal ranking; Academic journal; Google scholar; Citation impact; h-Index; g-Index; hc-Index ID CITATION ANALYSIS; H-INDEX; MANAGEMENT JOURNALS; SCIENTOMETRIC ANALYSIS; KNOWLEDGE MANAGEMENT; GLOBAL PERCEPTIONS; ACADEMIC JOURNALS; SYSTEMS RESEARCH; GOOGLE SCHOLAR; QUALITY AB This study presents a ranking of 182 academic journals in the field of artificial intelligence. For this, the revealed preference approach, also referred to as a citation impact method, was utilized to collect data from Google Scholar. This list was developed based on three relatively novel indices: h-index, g-index, and hc-index. These indices correlated almost perfectly with one another (ranging from 0.97 to 0.99), and they correlated strongly with Thomson's Journal Impact Factors (ranging from 0.64 to 0.69). It was concluded that journal longevity (years in print) is an important but not the only factor affecting an outlet's ranking position. Inclusion in Thomson's Journal Citation Reports is a must for a journal to be identified as a leading A+ or A level outlet. However, coverage by Thomson does not guarantee a high citation impact of an outlet. The presented list may be utilized by scholars who want to demonstrate their research output, various academic committees, librarians and administrators who are not familiar with the AI research domain. (C) 2010 Elsevier Ltd. All rights reserved. C1 Lakehead Univ, Fac Business Adm, Thunder Bay, ON P7B 5E1, Canada. RP Serenko, A (reprint author), Lakehead Univ, Fac Business Adm, 955 Oliver Rd, Thunder Bay, ON P7B 5E1, Canada. 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Informetr. PD OCT PY 2010 VL 4 IS 4 BP 447 EP 459 DI 10.1016/j.joi.2010.04.001 PG 13 WC Information Science & Library Science SC Information Science & Library Science GA 647KA UT WOS:000281616200001 ER PT J AU Strotmann, A Zhao, DZ AF Strotmann, Andreas Zhao, Dangzhi TI Combining commercial citation indexes and open-access bibliographic databases to delimit highly interdisciplinary research fields for citation analysis SO JOURNAL OF INFORMETRICS LA English DT Article DE Field delimitation; Citation analysis; Bibliometrics; Information science; Multiple databases ID MEDLINE; AUTHOR AB Field delimitation for citation analysis, the process of collecting a set of bibliographic records with cited-reference information of research articles that represent a research field, is the first step in any citation analysis study of a research field. Due to a number of limitations, the commercial citation indexes have long made it difficult to obtain a comprehensive dataset in this step. This paper discusses some of the limitations imposed by these databases, and reports on a method to overcome some of these limitations that was used with great success to delimit an emerging and highly interdisciplinary biomedical research field, stem cell research. The resulting field delimitation and the citation network it induces are both excellent. This multi-database method relies on using PubMed for the actual field delimitation, and on mapping between Scopus and PubMed records for obtaining comprehensive information about cited-references contained in the resulting literature. This method provides high-quality field delimitations for citation studies that can be used as benchmarks for studies of the impact of data collection biases on citation metrics, and may help improve confidence in results of scientometric studies for an increased impact of scientometrics on research policy. (C) 2010 Published by Elsevier Ltd. C1 [Strotmann, Andreas] Univ Alberta, Sch Publ Hlth, Edmonton, AB T6G 2V2, Canada. [Zhao, Dangzhi] Univ Alberta, Sch Lib & Informat Studies, Edmonton, AB T6G 2J4, Canada. RP Strotmann, A (reprint author), Univ Alberta, Sch Publ Hlth, 13-103 Clin Sci Bldg,11350-83 Ave, Edmonton, AB T6G 2V2, Canada. 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PD APR PY 2010 VL 4 IS 2 BP 194 EP 200 DI 10.1016/j.joi.2009.12.001 PG 7 WC Information Science & Library Science SC Information Science & Library Science GA 568II UT WOS:000275515500008 ER PT J AU Egghe, L AF Egghe, L. TI Mathematical derivation of the impact factor distribution SO JOURNAL OF INFORMETRICS LA English DT Article DE Impact factor; Rank distribution; S-shape; Central Limit Theorem; Average ID UNCITEDNESS AB Experimental data [Mansilla, R., Koppen, E., Cocho, G., & Miramontes, P. (2007). On the behavior of journal impact factor rank-order distribution. Journal of Informetrics, 1(2), 155-160] reveal that, if one ranks a set of journals (e. g. in a field) in decreasing order of their impact factors, the rank distribution of the logarithm of these impact factors has a typical S-shape: first a convex decrease, followed by a concave decrease. In this paper we give a mathematical formula for this distribution and explain the S-shape. Also the experimentally found smaller convex part and larger concave part is explained. If one studies the rank distribution of the impact factors themselves, we now prove that we have the same S-shape but with inflection point in mu, the average of the impact factors. These distributions are valid for any type of impact factor (any publication period and any citation period). They are even valid for any sample average rank distribution. (C) 2009 Elsevier Ltd. All rights reserved. C1 [Egghe, L.] Univ Hasselt UHasselt, B-3590 Diepenbeek, Belgium. [Egghe, L.] Univ Antwerp, B-2000 Antwerp, Belgium. RP Egghe, L (reprint author), Univ Hasselt UHasselt, Campus Diepenbeek,Agoralaan, B-3590 Diepenbeek, Belgium. EM leo.egghe@uhasselt.be CR Altman D. 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Klavans, Richard TI Measuring science-technology interaction using rare inventor-author names SO JOURNAL OF INFORMETRICS LA English DT Article DE science-technology interaction; inventor-author matching; patent mapping; patent distributions; rare names ID SCIENTIFIC LITERATURE; NANO-SCIENCE; PATENT DATA; NETWORKS; LINKAGE; INNOVATION; INTERFACE AB The relationship between science and technology has been extensively studied from both theoretical and quantitative perspectives. Quantitative studies typically use patents as proxy for technology and scientific papers as proxy for science, and investigate the relationship between the two. Most such studies have been limited to a single discipline or country. In this paper, we investigate science-technology interaction over a broad range of science and technology by identifying and validating a set of 18,251 inventor-authors through matching of rare names obtained from paper and patent data. These inventor-authors are listed as inventors on nearly 56,000 US patents between 2002 and 2006. Analysis of the distribution of these patents over classes shows that this 6.7% sample is a suitable sample for further analysis. In addition, a map of 290 IPC patent subclasses was created, showing the relationship between patent classes and industries as well as the distribution of patent classes with high science orientation and low science orientation. (C) 2008 Elsevier Ltd. All rights reserved. C1 [Boyack, Kevin W.] SciTech Strategies Inc, Albuquerque, NM 87122 USA. [Klavans, Richard] SciTech Strategies Inc, Berwyn, PA 19312 USA. RP Boyack, KW (reprint author), SciTech Strategies Inc, Albuquerque, NM 87122 USA. 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PD JUL PY 2008 VL 2 IS 3 BP 173 EP 182 DI 10.1016/j.joi.2008.03.001 PG 10 WC Information Science & Library Science SC Information Science & Library Science GA 327ZQ UT WOS:000257767400001 ER PT J AU Bornmann, L Daniel, HD AF Bornmann, Lutz Daniel, Hans-Dieter TI Gatekeepers of science - Effects of external reviewers' attributes on the assessments of fellowship applications SO JOURNAL OF INFORMETRICS LA English DT Article DE peer review; particularism; universalism; country of residence; gender; evaluation experience; judgmental tendencies ID PREDICTIVE-VALIDITY; COMMITTEE; SELECTION; INDEX; FOUNDATION; SCIENTISTS; DECISIONS; FAIRNESS; RANKING; QUALITY AB Aim: The scientific norm of universalism prescribes that external reviewers recommend the allocation of awards to young scientists solely on the basis of their scientific achievement. Since the evaluation of grants utilizes scientists with different personal attributes, it is natural to ask whether the norm of universalism reflects the actual evaluation practice. Subjects and methods: We investigated the influence of three attributes of external reviewers on their ratings in the selection procedure followed by the Boehringer Ingelheim Fonds (B.I.F.) for awarding long-term fellowships to doctoral and post-doctoral researchers in biomedicine: (i) number of applications assessed in the past for the B. I. F. (reviewers' evaluation experience), (ii) the reviewers' country of residence and (iii) the reviewers' gender. To analyze the reviewers' ratings (1: award; 2: maybe award; 3: no award) in an ordinal regression model (ORM) the following were considered in addition to the three attributes: (i) the scientific achievements of the fellowship applicants, (ii) interaction effects between reviewers' and applicants' attributes and (iii) judgmental tendencies of reviewers. Results: The results of the model estimations show no significant effect of the reviewers' attributes on the evaluation of B. I. F. fellowship applications. The ratings of the external reviewers are mainly determined by the applicants' scientific achievement prior to application. Conclusions: The results suggest that the external reviewers of the B. I. F. indeed achieved the foundation's goal of recommending applicants with higher scientific achievement for fellowships and of recommending those with lower scientific achievement for rejection. (c) 2006 Elsevier Ltd. All rights reserved. C1 [Bornmann, Lutz; Daniel, Hans-Dieter] ETH, Zurich, Switzerland. [Daniel, Hans-Dieter] Univ Zurich, Evaluat Office, ETH Zurich, CH-8006 Zurich, Switzerland. RP Bornmann, L (reprint author), ETH, Zurich, Switzerland. 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PD JAN PY 2007 VL 1 IS 1 BP 83 EP 91 DI 10.1016/j.joi.2006.09.005 PG 9 WC Information Science & Library Science SC Information Science & Library Science GA 274AN UT WOS:000253974300010 ER PT J AU Li, YR Radicchi, F Castellano, C Ruiz-Castillo, J AF Li, Yunrong Radicchi, Filippo Castellano, Claudio Ruiz-Castillo, Javier TI Quantitative evaluation of alternative field normalization procedures SO JOURNAL OF INFORMETRICS LA English DT Article DE Citation analysis; Citation practices; Normalization procedures; Citation inequality ID JOURNAL IMPACT FACTOR; RESEARCH PERFORMANCE; SCIENTOMETRIC INDICATORS; CITATION DISTRIBUTIONS; PUBLICATIONS; COUNTS; SCORES; SCALES; OUTPUT; INDEX AB Wide differences in publication and citation practices make impossible the direct comparison of raw citation counts across scientific disciplines. Recent research has studied new and traditional normalization procedures aimed at suppressing as much as possible these disproportions in citation numbers among scientific domains. Using the recently introduced IDCP (Inequality due to Differences in Citation Practices) method, this paper rigorously tests the performance of six cited-side normalization procedures based on the Thomson Reuters classification system consisting of 172 sub-fields. We use six yearly datasets from 1980 to 2004, with widely varying citation windows from the publication year to May 2011. The main findings are the following three. Firstly, as observed in previous research, within each year the shapes of sub-field citation distributions are strikingly similar. This paves the way for several normalization procedures to perform reasonably well in reducing the effect on citation inequality of differences in citation practices. Secondly, independently of the year of publication and the length of the citation window, the effect of such differences represents about 13% of total citation inequality. Thirdly, a recently introduced two-parameter normalization scheme outperforms the other normalization procedures over the entire period, reducing citation disproportions to a level very close to the minimum achievable given the data and the classification system. However, the traditional procedure of using sub-field mean citations as normalization factors yields also good results. (C) 2013 Elsevier Ltd. All rights reserved. C1 [Li, Yunrong; Ruiz-Castillo, Javier] Univ Carlos III Madrid, Dept Econ, E-28903 Getafe, Spain. [Radicchi, Filippo] Univ Rovira & Virgili, Dept Engn Quim, Tarragona, Spain. [Castellano, Claudio] Sapienza Univ Roma, Ist Sistemi Complessi ISC CNR, Rome, Italy. [Castellano, Claudio] Sapienza Univ Roma, Dipartimento Fis, Rome, Italy. 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TI Some modifications to the SNIP journal impact indicator SO JOURNAL OF INFORMETRICS LA English DT Article DE Journal impact; Journal indicator; Scopus; Source normalization; SNIP ID SOURCE NORMALIZED IMPACT; BIBLIOMETRIC RANKINGS; AUDIENCE FACTOR; CITATIONS; SCIENCE; PAPER AB The SNIP (source normalized impact per paper) indicator is an indicator of the citation impact of scientific journals. The indicator, introduced by Henk Moed in 2010, is included in Elsevier's Scopus database. The SNIP indicator uses a source normalized approach to correct for differences in citation practices between scientific fields. The strength of this approach is that it does not require a field classification system in which the boundaries of fields are explicitly defined. In this paper, a number of modifications that were recently made to the SNIP indicator are explained, and the advantages of the resulting revised SNIP indicator are pointed out. 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Globalization of science, in this respect, implies that collaboration among scientists takes place along the lines of common topics and irrespective of the spatial distances between the collaborators. The networks of collaborators, termed 'epistemic communities', should thus have a space-independent structure. This paper shows that such a notion of globalized scientific collaboration is not supported by empirical data. It introduces a novel approach of analyzing distance-dependent probabilities of collaboration. The results of the analysis of six distinct scientific fields reveal that intra-country collaboration is about 10-50 times more likely to occur than international collaboration. Moreover, strong dependencies exist between collaboration activity (measured in co-authorships) and spatial distance when confined to national borders. 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PD OCT PY 2011 VL 5 IS 4 BP 618 EP 628 DI 10.1016/j.joi.2011.06.001 PG 11 WC Information Science & Library Science SC Information Science & Library Science GA 841PI UT WOS:000296524200013 ER PT J AU Abramo, G Cicero, T D'Angelo, CA AF Abramo, Giovanni Cicero, Tindaro D'Angelo, Ciriaco Andrea TI Assessing the varying level of impact measurement accuracy as a function of the citation window length SO JOURNAL OF INFORMETRICS LA English DT Article DE Research evaluation; Scientific impact; Citation window; Peer review; Bibliometrics; Italy ID BIBLIOMETRIC INDICATORS; SCIENCE; COUNTS; TOOL AB With the passage of more time from the original date of publication, the measure of the impact of scientific works using subsequent citation counts becomes more accurate. However the measurement of individual and organizational research productivity should ideally refer to a period with closing date just prior to the evaluation exercise. 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Informetr. PD OCT PY 2011 VL 5 IS 4 BP 659 EP 667 DI 10.1016/j.joi.2011.06.004 PG 9 WC Information Science & Library Science SC Information Science & Library Science GA 841PI UT WOS:000296524200016 ER PT J AU Colliander, C Ahlgren, P AF Colliander, Cristian Ahlgren, Per TI The effects and their stability of field normalization baseline on relative performance with respect to citation impact: A case study of 20 natural science departments SO JOURNAL OF INFORMETRICS LA English DT Article DE Stability analysis; Field normalization baseline; Journal; ISI/Thomson Reuters subject category; Essential Science Indicators field; Citation impact ID CROSS-FIELD; INDICATORS; EXCELLENCE AB In this paper we study the effects of field normalization baseline on relative performance of 20 natural science departments in terms of citation impact. Impact is studied under three baselines: journal, ISI/Thomson Reuters subject category, and Essential Science Indicators field. For the measurement of citation impact, the indicators item-oriented mean normalized citation rate and Top-5% are employed. The results, which we analyze with respect to stability, show that the choice of normalization baseline matters. We observe that normalization against publishing journal is particular. The rankings of the departments obtained when journal is used as baseline, irrespective of indicator, differ considerably from the rankings obtained when ISI/Thomson Reuters subject category or Essential Science Indicators field is used. Since no substantial differences are observed when the baselines Essential Science Indicators field and ISI/Thomson Reuters subject category are contrasted, one might suggest that people without access to subject category data can perform reasonable normalized citation impact studies by combining normalization against journal with normalization against Essential Science Indicators field. (C) 2010 Elsevier Ltd. All rights reserved. C1 [Colliander, Cristian] Umea Univ, Dept Sociol, SE-90187 Umea, Sweden. [Ahlgren, Per] Univ Lib, Dept E Resources, SE-10691 Stockholm, Sweden. RP Colliander, C (reprint author), Umea Univ, Dept Sociol, SE-90187 Umea, Sweden. EM cristian.colliander@soc.umu.se RI Ahlgren, Per/A-5189-2009 OI Ahlgren, Per/0000-0003-0229-3073 CR Adams J, 2008, SCIENTOMETRICS, V75, P81, DOI 10.1007/s11192-007-1832-7 Ball R, 2009, SCIENTOMETRICS, V81, P381, DOI 10.1007/s11192-009-2120-5 Bornmann L, 2010, J INFORMETR, V4, P441, DOI 10.1016/j.joi.2010.04.004 Glanzel W, 1999, SCIENTOMETRICS, V46, P431, DOI 10.1007/BF02459602 Glanzel W, 2009, SCIENTOMETRICS, V78, P165, DOI 10.1007/s11192-008-2109-5 Kostoff RN, 2002, SCIENTOMETRICS, V53, P49, DOI 10.1023/A:1014831920172 Lundberg J, 2007, J INFORMETR, V1, P145, DOI 10.1016/j.joi.2006.09.007 Lunneborg C. 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PD JAN PY 2011 VL 5 IS 1 BP 101 EP 113 DI 10.1016/j.joi.2010.09.003 PG 13 WC Information Science & Library Science SC Information Science & Library Science GA 698WS UT WOS:000285626000009 ER PT J AU Piwowar, HA Chapman, WW AF Piwowar, Heather A. Chapman, Wendy W. TI Public sharing of research datasets: A pilot study of associations SO JOURNAL OF INFORMETRICS LA English DT Article; Proceedings Paper CT 1st Joint ASIS&T/ISS Conference Seminar 2009 CY NOV 07, 2009 CL Vancouver, CANADA DE Bibliometrics; Bioinformatics; Policy evaluation; Data sharing ID AUTHOR NAME DISAMBIGUATION; MICROARRAY DATA; EXPRESSION PROFILES; NATIONAL-SURVEY; INFORMATION; DATABASE; REPOSITORIES; SUBMISSION; SCIENCES; GENETICS AB The public sharing of primary research datasets potentially benefits the research community but is not yet common practice. In this pilot study, we analyzed whether data sharing frequency was associated with funder and publisher requirements, journal impact factor, or investigator experience and impact. Across 397 recent biomedical microarray studies, we found investigators were more likely to publicly share their raw dataset when their study was published in a high-impact journal and when the first or last authors had high levels of career experience and impact. We estimate the USA's National Institutes of Health (NIH) data sharing policy applied to 19% of the studies in our cohort; being subject to the NIH data sharing plan requirement was not found to correlate with increased data sharing behavior in multivariate logistic regression analysis. Studies published in journals that required a database submission accession number as a condition of publication were more likely to share their data, but this trend was not statistically significant. These early results will inform our ongoing larger analysis, and hopefully contribute to the development of more effective data sharing initiatives. (C) 2009 Elsevier Ltd. All rights reserved. C1 [Piwowar, Heather A.; Chapman, Wendy W.] Univ Pittsburgh, Dept Biomed Informat, Pittsburgh, PA 15260 USA. RP Piwowar, HA (reprint author), Univ Pittsburgh, Dept Biomed Informat, 200 Meyran Ave, Pittsburgh, PA 15260 USA. 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Informetr. PD APR PY 2010 VL 4 IS 2 BP 148 EP 156 DI 10.1016/j.joi.2009.11.010 PG 9 WC Information Science & Library Science SC Information Science & Library Science GA 568II UT WOS:000275515500003 ER PT J AU Khreisat, L AF Khreisat, Laila TI A machine learning approach for Arabic text classification using N-gram frequency statistics SO JOURNAL OF INFORMETRICS LA English DT Article DE Data mining; Classification; Categorization; Arabic; N-gram; Machine learning ID CATEGORIZATION AB In this paper a machine learning approach for classifying Arabic text documents is presented. To handle the high dimensionality of text documents, embeddings are used to map each document ( instance) into R ( the set of real numbers) representing the tri-gram frequency statistics profiles for a document. Classification is achieved by computing a dissimilarity measure, called the Manhattan distance, between the pro. le of the instance to be classified and the profiles of all the instances in the training set. The class ( category) to which an instance ( document) belongs is the one with the least computed Manhattan measure. The Dice similarity measure is used to compare the performance of method. Results show that tri-gram text classification using the Dice measure outperforms classification using the Manhattan measure. (C) 2008 Elsevier Ltd. All rights reserved. C1 Fairleigh Dickinson Univ, Dept Comp Sci Math & Phys, Madison, NJ 07940 USA. RP Khreisat, L (reprint author), Fairleigh Dickinson Univ, Dept Comp Sci Math & Phys, 285 Madison Ave, Madison, NJ 07940 USA. 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K., 1949, HUMAN BEHAV PRINCIPL NR 22 TC 12 Z9 12 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 1751-1577 J9 J INFORMETR JI J. Informetr. PD JAN PY 2009 VL 3 IS 1 BP 72 EP 77 DI 10.1016/j.joi.2008.11.005 PG 6 WC Information Science & Library Science SC Information Science & Library Science GA 395BI UT WOS:000262496700007 ER PT J AU Ye, FY Rousseau, R AF Ye, Fred Y. Rousseau, Ronald TI The power law model and total career h-index sequences SO JOURNAL OF INFORMETRICS LA English DT Article DE h-Index sequences; Power law models; Data fitting ID HIRSCH-INDEX AB Three variations on the power law model proposed by Egghe are fitted to four groups of h-index time series: publication-citation data for authors, journals and universities; and patent citation data for firms. It is shown that none of the power law models yields an adequate description of total career h-index sequences. (C) 2008 Elsevier Ltd. All rights reserved. C1 [Rousseau, Ronald] KHBO Assoc KU Leuven, B-8400 Oostende, Belgium. [Rousseau, Ronald] Katholieke Univ Leuven, Steunpunt O&O Indicatoren & Dept, MSI, B-3000 Louvain, Belgium. [Ye, Fred Y.] Inst Sci & Tech Informat China, Beijing, Peoples R China. [Ye, Fred Y.] Zhejiang Univ, Dept Informat Resources Management, Hangzhou, Zhejiang, Peoples R China. RP Rousseau, R (reprint author), KHBO Assoc KU Leuven, Zeedijk 101, B-8400 Oostende, Belgium. EM yye@zju.edu.cn; ronald.rousseau@khbo.be CR Bradford S. 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TI Examples of simple transformations of the h-index: Qualitative and quantitative conclusions and consequences for other indices SO JOURNAL OF INFORMETRICS LA English DT Article DE h-index; Hirsch; transformation; g-index; weighted h-index; R-index ID HIRSCH-INDEX; SCIENTISTS; RANKING AB General results on transformations on information production processes (IPPs), involving transformations of the h-index and related indices, are applied in concrete, simple cases: doubling the production per source, doubling the number of sources, doubling the number of sources but halving their production, halving the number of sources but doubling their production (fusion of sources) and, finally, special cases of general power law transformations. In each case we calculate concrete transformation formulae for the h-index h (transformed into h*) and we discuss when we have h* < h, h* = h or h* > h. These results are then extended to some other h-type indices such as the g-index, the R-index and the weighted h-index. (C) 2007 Elsevier Ltd. All rights reserved. C1 [Egghe, L.] Univ Hasselt, B-3590 Diepenbeek, Belgium. [Egghe, L.] Univ Antwerp, B-2610 Antwerp, Belgium. RP Egghe, L (reprint author), Univ Hasselt, Campus Diepenbeek, B-3590 Diepenbeek, Belgium. 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Informetr. PD APR PY 2008 VL 2 IS 2 BP 136 EP 148 DI 10.1016/j.joi.2007.12.003 PG 13 WC Information Science & Library Science SC Information Science & Library Science GA 296TK UT WOS:000255568500003 ER PT J AU Kretschmer, H Kretschmer, T AF Kretschmer, Hildrun Kretschmer, Theo TI Lotka's distribution and distribution of co-author pairs' frequencies SO JOURNAL OF INFORMETRICS LA English DT Article DE Lotka's distribution; collaboration; co-authors; Gestalt theory; Yin-Yang-teaching ID INTERNATIONAL SCIENTIFIC COLLABORATION; LINK INDICATOR; SCIENCE; COUNTRIES; PROFILES; NETWORKS; PATTERNS AB The original Lotka's Law refers to single scientist distribution, i.e. the frequency of authors A(i) with i publications per author is a function of i: A(i) =f(i). However, with increasing collaboration in science and in technology the study of the frequency of pairs or triples of co-authors is highly relevant. Starting with pair distribution well-ordered collaboration structures of co-author pairs will be presented, i.e. the frequency of co-author pairs N-ij between authors with i publications per author and authors with j publications per author is a function of i and j: N-ij =f(i,j) using the normal count procedure for counting i or j. We have assumed that the distribution of co-author pairs' frequencies can be considered to be reflection of a social Gestalt and therefore can be described by the corresponding mathematical function based on well-known general characteristics of structures in interpersonal relations in social networks. We have shown that this model of social Gestalts can better explain the distribution of co-author pairs than by a simple bivariate function in analogy to Lotka's Law. This model is based on both the Gestalt theory and the old Chinese Yin/Yang theory. (c) 2007 Elsevier Ltd. All fights reserved. 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Informetr. PY 2007 VL 1 IS 4 BP 308 EP 337 DI 10.1016/j.joi.2007.07.003 PG 30 WC Information Science & Library Science SC Information Science & Library Science GA 272BF UT WOS:000253831900005 ER PT J AU Bornmann, L Leydesdorff, L Wang, J AF Bornmann, Lutz Leydesdorff, Loet Wang, Jian TI Which percentile-based approach should be preferred for calculating normalized citation impact values? An empirical comparison of five approaches including a newly developed citation-rank approach (P100) SO JOURNAL OF INFORMETRICS LA English DT Article DE Citation impact normalization; Percentile; Percentile rank class; P100; Citation rank ID RESEARCH PERFORMANCE; RELATIVE INDICATORS; PUBLICATION; JOURNALS; SCIENCE; CHARTS AB For comparisons of citation impacts across fields and overtime, bibliometricians normalize the observed citation counts with reference to an expected citation value. Percentile-based approaches have been proposed as a non-parametric alternative to parametric central-tendency statistics. Percentiles are based on an ordered set of citation counts in a reference set, whereby the fraction of papers at or below the citation counts of a focal paper is used as an indicator for its relative citation impact in the set. In this study, we pursue two related objectives: (I) although different percentile-based approaches have been developed, an approach is hitherto missing that satisfies a number of criteria such as scaling of the percentile ranks from zero (all other papers perform better) to 100 (all other papers perform worse), and solving the problem with tied citation ranks unambiguously. We introduce a new citation-rank approach having these properties, namely P100; (2) we compare the reliability of P100 empirically with other percentile-based approaches, such as the approaches developed by the SCImago group, the Centre for Science and Technology Studies (CWTS), and Thomson Reuters (InCites), using all papers published in 1980 in Thomson Reuters Web of Science (WoS). How accurately can the different approaches predict the long-term citation impact in 2010 (in year 31) using citation impact measured in previous time windows (years 1-30)? The comparison of the approaches shows that the method used by InCites overestimates citation impact (because of using the highest percentile rank when papers are assigned to more than a single subject category) whereas the SCImago indicator shows higher power in predicting the long-term citation impact on the basis of citation rates in early years. Since the results show a disadvantage in this predictive ability for P100 against the other approaches, there is still room for further improvements. (C) 2013 Elsevier Ltd. All rights reserved. C1 [Bornmann, Lutz] Adm Headquarters Max Planck Soc, Div Sci & Innovat Studies, D-80539 Munich, Germany. [Leydesdorff, Loet] Univ Amsterdam, Amsterdam Sch Commun Res ASCoR, NL-1012 CX Amsterdam, Netherlands. [Wang, Jian] Inst Res Informat & Qual Assurance iFQ, D-10117 Berlin, Germany. [Wang, Jian] Katholieke Univ Leuven, Ctr R&D Monitoring ECOOM, Dept Managerial Econ Strategy & Innovat, B-3000 Louvain, Belgium. RP Bornmann, L (reprint author), Adm Headquarters Max Planck Soc, Div Sci & Innovat Studies, Hofgartenstr 8, D-80539 Munich, Germany. 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Informetr. PY 2013 VL 7 IS 4 BP 933 EP 944 DI 10.1016/j.joi.2013.09.003 PG 12 WC Information Science & Library Science SC Information Science & Library Science GA 264ZV UT WOS:000327920400018 ER PT J AU Waltman, L van Eck, NJ AF Waltman, Ludo van Eck, Nees Jan TI A systematic empirical comparison of different approaches for normalizing citation impact indicators SO JOURNAL OF INFORMETRICS LA English DT Article DE Citation; Classification system; Normalization; Source normalization ID NATIONAL RESEARCH PERFORMANCE; FIELD-NORMALIZATION; SCIENTIFIC EXCELLENCE; BIBLIOMETRIC TOOLS; AUDIENCE FACTOR; CROSS-FIELD; SCIENCE; FAIRNESS; JOURNALS; RANKINGS AB We address the question how citation-based bibliometric indicators can best be normalized to ensure fair comparisons between publications from different scientific fields and different years. In a systematic large-scale empirical analysis, we compare a traditional normalization approach based on a field classification system with three source normalization approaches. We pay special attention to the selection of the publications included in the analysis. Publications in national scientific journals, popular scientific magazines, and trade magazines are not included. Unlike earlier studies, we use algorithmically constructed classification systems to evaluate the different normalization approaches. Our analysis shows that a source normalization approach based on the recently introduced idea of fractional citation counting does not perform well. Two other source normalization approaches generally outperform the classification-system-based normalization approach that we study. Our analysis therefore offers considerable support for the use of source-normalized bibliometric indicators. (C) 2013 Elsevier Ltd. All rights reserved. C1 [Waltman, Ludo; van Eck, Nees Jan] Leiden Univ, Ctr Sci & Technol Studies, NL-2300 RA Leiden, Netherlands. RP Waltman, L (reprint author), Leiden Univ, Ctr Sci & Technol Studies, NL-2300 RA Leiden, Netherlands. EM waltmanlr@cwts.leidenuniv.nl; ecknjpvan@cwts.leidenuniv.nl CR Abramo G, 2012, J INFORMETR, V6, P470, DOI 10.1016/j.joi.2012.03.005 BRAUN T, 1990, SCIENTOMETRICS, V19, P513, DOI 10.1007/BF02020712 Buela-Casal G, 2006, SCIENTOMETRICS, V67, P45, DOI 10.1556/Scient.67.2006.1.4 Radicchi F, 2012, PLOS ONE, V7, DOI 10.1371/journal.pone.0033833 Crespo J. 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Informetr. PY 2013 VL 7 IS 4 BP 833 EP 849 DI 10.1016/j.joi.2013.08.002 PG 17 WC Information Science & Library Science SC Information Science & Library Science GA 264ZV UT WOS:000327920400008 ER PT J AU Abramo, G Cicero, T D'Angelo, CA AF Abramo, Giovanni Cicero, Tindaro D'Angelo, Ciriaco Andrea TI Revisiting the scaling of citations for research assessment SO JOURNAL OF INFORMETRICS LA English DT Article DE Research evaluation; Bibliometrics; Citations; Scaling AB Over the past decade, national research evaluation exercises, traditionally conducted using the peer review method, have begun opening to bibliometric indicators. The citations received by a publication are assumed as proxy for its quality, but they require standardization prior to use in comparative evaluation of organizations or individual scientists: the citation data must be standardized, due to the varying citation behavior across research fields. The objective of this paper is to compare the effectiveness of the different methods of normalizing citations, in order to provide useful indications to research assessment practitioners. Simulating a typical national research assessment exercise, he analysis is conducted for all subject categories in the hard sciences and is based on the Thomson Reuters Science Citation Index-Expanded (R). Comparisons show that the citations average is the most effective scaling parameter, when the average is based only on the publications actually cited. (C) 2012 Elsevier Ltd. All rights reserved. C1 [Abramo, Giovanni; Cicero, Tindaro; D'Angelo, Ciriaco Andrea] Univ Roma Tor Vergata, Sch Engn, Dept Management, Lab Studies Res & Technol Transfer, Rome, Italy. [Abramo, Giovanni] Natl Res Council Italy, Inst Syst Anal & Comp Sci IASI CNR, Rome, Italy. RP Abramo, G (reprint author), Univ Roma Tor Vergata, Sch Engn, Dept Management, Lab Studies Res & Technol Transfer, Rome, Italy. EM giovanni.abramo@uniroma2.it RI D'Angelo, Ciriaco Andrea/J-8162-2012 CR Abramo G, 2011, SCIENTOMETRICS, V87, P399, DOI 10.1007/s11192-010-0319-0 Abramo G, 2011, SCIENTOMETRICS, V87, P499, DOI 10.1007/s11192-011-0352-7 Albarran P., 2009, EC SERIES U CARLOS 3 Bormann L., 2009, J AM SOC INFORM SCI, V60, P1664 BOX GEP, 1964, J ROY STAT SOC B, V26, P211 ERA, 2010, EXC RES AUSTR IN Glanzel W., 2008, P WIS 2008 BERL Gupta H. 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PD OCT PY 2012 VL 6 IS 4 BP 470 EP 479 DI 10.1016/j.joi.2012.03.005 PG 10 WC Information Science & Library Science SC Information Science & Library Science GA 003AY UT WOS:000308581700003 ER PT J AU Waltman, L Tijssen, RJW van Eck, NJ AF Waltman, Ludo Tijssen, Robert J. W. van Eck, Nees Jan TI Globalisation of science in kilometres SO JOURNAL OF INFORMETRICS LA English DT Article DE Collaboration; Geocoding; Geographical distance; Globalisation ID SCIENTIFIC COLLABORATION; GEOGRAPHICAL PROXIMITY; EUROPE; KNOWLEDGE; PATTERNS AB The ongoing globalisation of science has undisputedly a major impact on how and where scientific research is being conducted nowadays. Yet, the big picture remains blurred. It is largely unknown where this process is heading, and at which rate. Which countries are leading or lagging? Many of its key features are difficult if not impossible to capture in measurements and comparative statistics. Our empirical study measures the extent and growth of scientific globalisation in terms of physical distances between co-authoring researchers. Our analysis, drawing on 21 million research publications across all countries and fields of science, reveals that contemporary science has globalised at a fairly steady rate during recent decades. The average collaboration distance per publication has increased from 334 km in 1980 to 1553 km in 2009. Despite significant differences in globalisation rates across countries and fields of science, we observe a pervasive process in motion, moving towards a truly interconnected global science system. (C) 2011 Elsevier Ltd. All rights reserved. C1 [Waltman, Ludo; Tijssen, Robert J. W.; van Eck, Nees Jan] Leiden Univ, Ctr Sci & Technol Studies CWTS, NL-2300 AX Leiden, Netherlands. [Tijssen, Robert J. W.] Univ Stellenbosch, Ctr Res Evaluat Sci & Technol CREST, ZA-7600 Stellenbosch, South Africa. RP Waltman, L (reprint author), Leiden Univ, Ctr Sci & Technol Studies CWTS, POB 905, NL-2300 AX Leiden, Netherlands. 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Informetr. PD OCT PY 2011 VL 5 IS 4 BP 574 EP 582 DI 10.1016/j.joi.2011.05.003 PG 9 WC Information Science & Library Science SC Information Science & Library Science GA 841PI UT WOS:000296524200009 ER PT J AU Perc, M AF Perc, Matjaz TI Zipf's law and log-normal distributions in measures of scientific output across fields and institutions: 40 years of Slovenia's research as an example SO JOURNAL OF INFORMETRICS LA English DT Article DE Zipf's law; Citation distribution; g-Index; h-Index; Ranking ID SELF-CITATION CORRECTIONS; H-INDEX; COMPLEX NETWORKS; GROWING NETWORKS; POWER; PUBLICATION; ADVANTAGE AB Slovenia's Current Research Information System (SICRIS) currently hosts 86,443 publications with citation data from 8359 researchers working on the whole plethora of social and natural sciences from 1970 till present. Using these data, we show that the citation distributions derived from individual publications have Zipfian properties in that they can be fitted by a power law P(x)similar to x(-alpha), with alpha between 2.4 and 3.1 depending on the institution and field of research. Distributions of indexes that quantify the success of researchers rather than individual publications, on the other hand, cannot be associated with a power law. We find that for Egghe's g-index and Hirsch's h-index the log-normal form P(x)similar to exp[-alnx - b(ln x)(2)] applies best, with a and b depending moderately on the underlying set of researchers. In special cases, particularly for institutions with a strongly hierarchical constitution and research fields with high self-citation rates, exponential distributions can be observed as well. Both indexes yield distributions with equivalent statistical properties, which is a strong indicator for their consistency and logical connectedness. 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K., 1949, HUMAN BEHAV PRINCIPL NR 52 TC 11 Z9 11 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 1751-1577 J9 J INFORMETR JI J. Informetr. PD JUL PY 2010 VL 4 IS 3 BP 358 EP 364 DI 10.1016/j.joi.2010.03.001 PG 7 WC Information Science & Library Science SC Information Science & Library Science GA 607YQ UT WOS:000278543600015 ER PT J AU Skupin, A AF Skupin, Andre TI Discrete and continuous conceptualizations of science: Implications for knowledge domain visualization SO JOURNAL OF INFORMETRICS LA English DT Article DE Visualization; Conceptualization; Spatial concepts; Geographic information science; Knowledge domain visualization; Geography ID GEOGRAPHY; LITERATURES AB Visual depiction of the structure and evolution of science has been proposed as a key strategy for dealing with the large, complex, and increasingly interdisciplinary records of scientific communication. While every such visualization assumes the existence of spatial structures within the system of science, new methods and tools are rarely linked to thorough reflection on the underlying spatial concepts. Meanwhile, geographic information science has adopted a view of geographic space as conceptualized through the duality of discrete objects and continuous fields. This paper argues that conceptualization of science has been dominated by a view of its constituent elements (e.g., authors, articles, journals, disciplines) as discrete objects. It is proposed that, like in geographic information science, alternative concepts could be used for the same phenomenon. For example, one could view an author as either a discrete object at a specific location or as a continuous field occupying all of a discipline. It is further proposed that this duality of spatial concepts can extend to the methods by which low-dimensional geometric models of high-dimensional scientific spaces are created and used. 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PD JUL PY 2009 VL 3 IS 3 BP 233 EP 245 DI 10.1016/j.joi.2009.03.002 PG 13 WC Information Science & Library Science SC Information Science & Library Science GA 459WT UT WOS:000267144200007 ER PT J AU Nicolaisen, J Frandsen, TF AF Nicolaisen, Jeppe Frandsen, Tove Faber TI The Reference Return Ratio SO JOURNAL OF INFORMETRICS LA English DT Article DE journal impact measures; citation habits : citation dynamics; document types; journal self-citations ID CITATION ANALYSIS; SCIENTIFIC JOURNALS; IMPACT; PERSUASION AB The paper introduces a new journal impact measure called The Reference Return Ratio (3R). Unlike the traditional Journal Impact Factor (JIF), which is based on calculations of publications and citations, the new measure is based on calculations of bibliographic investments (references) and returns (citations). A comparative study of the two measures shows a strong relationship between the 3R and the JIF. Yet, the 3R appears to correct for citation habits, citation dynamics, and composition of document types - problems that typically are raised against the JIF. In addition, contrary to traditional impact measures, the 3R cannot be manipulated ad infinitum through journal self-citations. (C) 2007 Elsevier Ltd. All rights reserved. C1 [Nicolaisen, Jeppe; Frandsen, Tove Faber] Royal Sch Library & Informat Sci, DK-2300 Copenhagen, Denmark. RP Nicolaisen, J (reprint author), Royal Sch Library & Informat Sci, Birketinget 6, DK-2300 Copenhagen, Denmark. EM jni@db.dk; tff@db.dk RI Frandsen, Tove/A-6185-2012 OI Frandsen, Tove/0000-0002-8983-5009 CR CAMERON BD, 2005, LIB ACAD, V5, P105 Case DO, 2000, J AM SOC INFORM SCI, V51, P635, DOI 10.1002/(SICI)1097-4571(2000)51:7<635::AID-ASI6>3.0.CO;2-H DIAMOND AM, 1986, J HUM RESOUR, V21, P200 DIODATO V, 1984, P 47 ASIS ANN M, P217 Frandsen TF, 2007, J INFORMETR, V1, P47, DOI 10.1016/j.joi.2006.09.002 GARFIELD E, 1972, SCIENCE, V178, P471, DOI 10.1126/science.178.4060.471 GIANZEL W, 1995, J INF SCI, V21, P37 GIANZEL W, 2002, SCIENTOMETRICS, V53, P171 GILBERT GN, 1977, SOC STUD SCI, V7, P113 Hagstrom W., 1965, SCI COMMUNITY LAW J, 1982, SOC STUD SCI, V12, P535, DOI 10.1177/030631282012004003 MacRoberts MH, 1996, SCIENTOMETRICS, V36, P435, DOI 10.1007/BF02129604 MERTON RK, 1979, CITATION INDEXING IT, pR7 Moed HF, 2005, CURR SCI INDIA, V89, P1990 MOED HF, 1983, MEASUREMENT RES PERF Moed HF, 1996, SCIENTOMETRICS, V37, P105, DOI 10.1007/BF02093487 Nicolaisen J, 2002, RES EVALUAT, V11, P129, DOI 10.3152/147154402781776808 PINSKI G, 1976, INFORM PROCESS MANAG, V12, P297, DOI 10.1016/0306-4573(76)90048-0 PRICE DD, 1981, SCIENTOMETRICS, V3, P55 Rousseau R, 2002, LIBR TRENDS, V50, P418 Seglen PO, 1997, BRIT MED J, V314, P498 SMITH LC, 1981, LIBR TRENDS, V30, P83 TOUTKOUSHIAN RK, 1994, REV HIGH EDUC, V18, P61 YANOVSKY VI, 1981, SCIENTOMETRICS, V3, P223, DOI 10.1007/BF02101667 NR 24 TC 11 Z9 11 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 1751-1577 J9 J INFORMETR JI J. Informetr. PD APR PY 2008 VL 2 IS 2 BP 128 EP 135 DI 10.1016/j.joi.2007.12.001 PG 8 WC Information Science & Library Science SC Information Science & Library Science GA 296TK UT WOS:000255568500002 ER PT J AU Bornmann, L Marx, W AF Bornmann, Lutz Marx, Werner TI The proposal of a broadening of perspective in evaluative bibliometrics by complementing the times cited with a cited reference analysis SO JOURNAL OF INFORMETRICS LA English DT Article DE Citation impact; Normalized citation counts; Journal impact factor; Cited references ID PREDICTIVE-VALIDITY; PUBLICATIONS; DIFFUSION; HISTORY AB A proposal is made in this paper for a broadening of perspective in evaluative bibliometrics by complementing the (standard) times cited with a cited reference analysis for a fieldspecific citation impact measurement. The times cited approach counts the citations of a given publication set. In contrast, we change the perspective and start by selecting all papers dealing with a specific research topic or field (the example in this study is research on Aspirin). Then we extract all cited references from the papers of this field-specific publication set and analyse which papers, scientists, and journals have been cited most often. In this study, we use the Chemical Abstracts registry number to select the publications for a specific field. However, the cited reference approach can be used with any other field classification system proposed up to now. (C) 2012 Elsevier Ltd. All rights reserved. C1 [Bornmann, Lutz] Max Planck Gesell, Adm Headquarters, Div Sci & Innovat Studies, D-80539 Munich, Germany. [Marx, Werner] Max Planck Inst Solid State Res, D-70569 Stuttgart, Germany. RP Bornmann, L (reprint author), Max Planck Gesell, Adm Headquarters, Div Sci & Innovat Studies, Hofgartenstr 8, D-80539 Munich, Germany. EM bornmann@gv.mpg.de RI Bornmann, Lutz/A-3926-2008; Marx, Werner/G-6801-2012 OI Bornmann, Lutz/0000-0003-0810-7091; Marx, Werner/0000-0002-1763-5753 CR Bornmann L., 2008, ETHICS SCI ENV POLIT, V8, P93, DOI DOI 10.3354/ESEP00084 Bornmann L, 2011, J R STAT SOC A STAT, V174, P857, DOI 10.1111/j.1467-985X.2011.00689.x Bornmann L, 2011, J AM SOC INF SCI TEC, V62, P61, DOI 10.1002/asi.21418 Bornmann L, 2010, PLOS ONE, V5, DOI 10.1371/journal.pone.0011344 Di Vaio G, 2012, EXPLOR ECON HIST, V49, P92, DOI 10.1016/j.eeh.2011.10.002 Froghi S, 2012, BJU INT, V109, P321, DOI 10.1111/j.1464-410X.2011.10856.x Garfield E, 2006, JAMA-J AM MED ASSOC, V295, P90, DOI 10.1001/jama.295.1.90 KESSLER MM, 1963, AM DOC, V14, P10, DOI 10.1002/asi.5090140103 Kreiman G., 2011, FRONTIERS COMPUTATIO, V5 Kuhn T. S., 1970, CRITICISM GROWTH KNO, P1 Laband DN, 2012, KYKLOS, V65, P236, DOI 10.1111/j.1467-6435.2012.00536.x LEYDESDORFF L, 1994, SCIENTOMETRICS, V31, P59, DOI 10.1007/BF02018102 Leydesdorff L, 2011, J AM SOC INF SCI TEC, V62, P1370, DOI 10.1002/asi.21534 Liming L., 2010, GEOMATICS INFORM SCI, V35, P6 Liu YX, 2012, J DOC, V68, P31, DOI 10.1108/00220411211200310 Liu YX, 2010, J AM SOC INF SCI TEC, V61, P340, DOI 10.1002/asi.21248 National Science Board, 2012, 1201 NSB van Leeuwen TN, 2012, RES EVALUAT, V21, P61, DOI 10.1093/reseval/rvr006 Vinkler P, 2010, CHANDOS INF PROF SER, P1, DOI 10.1533/9781780630250 Waltman L., 2012, NEW METHODOLOGY CONS NR 20 TC 10 Z9 10 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 1751-1577 J9 J INFORMETR JI J. Informetr. PD JAN PY 2013 VL 7 IS 1 BP 84 EP 88 DI 10.1016/j.joi.2012.09.003 PG 5 WC Information Science & Library Science SC Information Science & Library Science GA 065BG UT WOS:000313121300008 ER PT J AU Didegah, F Thelwall, M AF Didegah, Fereshteh Thelwall, Mike TI Which factors help authors produce the highest impact research? Collaboration, journal and document properties SO JOURNAL OF INFORMETRICS LA English DT Article DE Citation factors; Research impact; Hurdle model ID SCIENTIFIC COLLABORATION; CITATION COUNTS; CO-AUTHORSHIP; ARTICLES; SCIENCE; DETERMINANTS; PUBLICATION; PSYCHOLOGY; ABSTRACTS; CHEMISTRY AB This study assesses whether eleven factors associate with higher impact research: individual, institutional and international collaboration; journal and reference impacts; abstract readability; reference and keyword totals; paper, abstract and title lengths. Authors may have some control over these factors and hence this information may help them to conduct and publish higher impact research. These factors have been previously researched but with partially conflicting findings. A simultaneous assessment of these eleven factors for Biology and Biochemistry, Chemistry and Social Sciences used a single negative binomial-logit hurdle model estimating the percentage change in the mean citation counts per unit of increase or decrease in the predictor variables. The journal Impact Factor was found to significantly associate with increased citations in all three areas. The impact and the number of cited references and their average citation impact also significantly associate with higher article citation impact. Individual and international teamwork give a citation advantage in Biology and Biochemistry and Chemistry but inter-institutional teamwork is not important in any of the three subject areas. Abstract readability is also not significant or of no practical significance. Among the article size features, abstract length significantly associates with increased citations but the number of keywords, title length and paper length are insignificant or of no practical significance. In summary, at least some aspects of collaboration, journal and document properties significantly associate with higher citations. The results provide new and particularly strong statistical evidence that the authors should consider publishing in high impact journals, ensure that they do not omit relevant references, engage in the widest possible team working, when appropriate, and write extensive abstracts. A new finding is that whilst is seems to be useful to collaborate and to collaborate internationally, there seems to be no particular need to collaborate with other institutions within the same country. (C) 2013 Elsevier Ltd. All rights reserved. C1 [Didegah, Fereshteh; Thelwall, Mike] Wolverhampton Univ, Stat Cybermetr Res Grp, Sch Technol, Wolverhampton WV1 1LY, W Midlands, England. RP Didegah, F (reprint author), Wolverhampton Univ, Stat Cybermetr Res Grp, Sch Technol, Wulfruna St, Wolverhampton WV1 1LY, W Midlands, England. EM f.didegah@wlv.ac.uk; m.thelwall@wlv.ac.uk CR Aksnes DW, 2003, RES EVALUAT, V12, P159, DOI 10.3152/147154403781776645 ARMBRUSTER BB, 1985, EDUC LEADERSHIP, V42, P18 Bornmann L, 2012, J INFORMETR, V6, P11, DOI 10.1016/j.joi.2011.08.004 Bornmann L, 2007, J AM SOC INF SCI TEC, V58, P1100, DOI 10.1002/asi.20531 BOTTLE RT, 1983, J INFORM SCI, V6, P103, DOI 10.1177/016555158300600402 Boyack K. W., 2005, P 10 INT C INT SOC S, V1, P335 Callaham M, 2002, JAMA-J AM MED ASSOC, V287, P2847, DOI 10.1001/jama.287.21.2847 Cameron C. A., 2001, ESSENTIALS COUNT DAT Cherry L. 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J., 1989, SOC SOC STUD SCI ANN Meadows A. J., 1998, COMMUNICATING RES Milojevic S, 2013, SCIENTOMETRICS, V95, P141, DOI 10.1007/s11192-012-0861-z Nagaoka S., 2011, KNOWLEDGE CREATION P NARIN F, 1991, SCIENTOMETRICS, V21, P313, DOI 10.1007/BF02093973 Persson O, 2004, SCIENTOMETRICS, V60, P421, DOI 10.1023/B:SCIE.0000034384.35498.7d PETERS HPF, 1994, J AM SOC INFORM SCI, V45, P39, DOI 10.1002/(SICI)1097-4571(199401)45:1<39::AID-ASI5>3.0.CO;2-Q Sooryamoorthy R, 2009, SCIENTOMETRICS, V81, P177, DOI 10.1007/s11192-009-2126-z Stremersch S, 2007, J MARKETING, V71, P171, DOI 10.1509/jmkg.71.3.171 van Dalen HP, 2005, SCIENTOMETRICS, V64, P209, DOI 10.1007/s11192-005-0248-5 Van Raan AFJ, 1998, SCIENTOMETRICS, V43, P129 Vieira ES, 2010, J INFORMETR, V4, P1, DOI 10.1016/j.joi.2009.06.002 Whitlow E. S., 1990, 12900 EUR Zhao DZ, 2010, SCIENTOMETRICS, V84, P293, DOI 10.1007/s11192-010-0191-y Zimmerman J. L., 1989, ISSUES ACCOUNTING ED, V4, P458 NR 43 TC 10 Z9 10 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 1751-1577 EI 1875-5879 J9 J INFORMETR JI J. Informetr. PY 2013 VL 7 IS 4 BP 861 EP 873 DI 10.1016/j.joi.2013.08.006 PG 13 WC Information Science & Library Science SC Information Science & Library Science GA 264ZV UT WOS:000327920400011 ER PT J AU Wang, XW Xu, SM Peng, L Wang, Z Wang, CL Zhang, CB Wang, XB AF Wang, Xianwen Xu, Shenmeng Peng, Lian Wang, Zhi Wang, Chuanli Zhang, Chunbo Wang, Xianbing TI Exploring scientists' working timetable: Do scientists often work overtime? SO JOURNAL OF INFORMETRICS LA English DT Article DE Scientist; Realtime; Working habits; Springer; Work-family conflict AB A novel method is proposed to monitor and record scientists' working timetable. We record the downloads information of scientific papers real-timely from Springer round the clock, and try to explore scientists' working habits. As our observation demonstrates, many scientists are still engaged in their research after working hours every day. Many of them work far into the night, even till next morning. In addition, research work also intrudes into their weekends. Different working time patterns are revealed. In the US, overnight work is more prevalent among scientists, while Chinese scientists mostly have busy weekends with their scientific research. (C) 2012 Elsevier Ltd. All rights reserved. C1 [Wang, Xianwen; Xu, Shenmeng; Peng, Lian; Wang, Zhi; Wang, Chuanli; Zhang, Chunbo] Dalian Univ Technol, Fac Humanities & Social Sci, WISE Lab, Dalian 116085, Peoples R China. [Wang, Xianwen; Xu, Shenmeng; Peng, Lian; Wang, Zhi; Wang, Chuanli; Zhang, Chunbo] Dalian Univ Technol, Sch Publ Adm & Law, Dalian 116085, Peoples R China. [Wang, Xianwen] Dalian Univ Technol, DUT Drexel Joint Inst Study Knowledge Visualizat, Dalian 116085, Peoples R China. [Wang, Xianbing] Dalian Univ Technol, Sch Control Sci & Engn, Dalian 116085, Peoples R China. RP Wang, XW (reprint author), Dalian Univ Technol, Fac Humanities & Social Sci, WISE Lab, Dalian 116085, Peoples R China. EM xianwenwang@dlut.edu.cn CR Fox MF, 2011, SOC STUD SCI, V41, P715, DOI 10.1177/0306312711417730 Jacobs JA, 2004, ANN AM ACAD POLIT SS, V596, P104, DOI 10.1177/0002716204268185 Ledford H, 2011, NATURE, V477, P20, DOI 10.1038/477020a Petkova K., 1994, PUBLIC UNDERST SCI, V3, P215, DOI 10.1088/0963-6625/3/2/005 NR 4 TC 10 Z9 10 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 1751-1577 J9 J INFORMETR JI J. Informetr. PD OCT PY 2012 VL 6 IS 4 BP 655 EP 660 DI 10.1016/j.joi.2012.07.003 PG 6 WC Information Science & Library Science SC Information Science & Library Science GA 003AY UT WOS:000308581700024 ER PT J AU He, B Ding, Y Yan, EJ AF He, Bing Ding, Ying Yan, Erjia TI Mining patterns of author orders in scientific publications SO JOURNAL OF INFORMETRICS LA English DT Article DE Author orders; Author sequence; Scientific collaboration ID SEQUENTIAL PATTERNS; COLLABORATION; REFLECTIONS; CREDIT; 1ST AB The author order of multi-authored papers can reveal subtle patterns of scientific collaboration and provide insights on the nature of credit assignment among coauthors. This article proposes a sequence-based perspective on scientific collaboration. Using frequently occurring sequences as the unit of analysis, this study explores (1) what types of sequence patterns are most common in the scientific collaboration at the level of authors, institutions, U. S. states, and nations in Library and Information Science (LIS); and (2) the productivity (measured by number of papers) and influence (measured by citation counts) of different types of sequence patterns. Results show that (1) the productivity and influence approximately follow the power law for frequent sequences in the four levels of analysis; (2) the productivity and influence present a significant positive correlation among frequent sequences, and the strength of the correlation increases with the level of integration; (3) for author-level, institution-level, and state-level frequent sequences, short geographical distances between the authors usually co-present with high productivities, while long distances tend to co-occur with large citation counts; (4) for author-level frequent sequences, the pattern of "the more productive and prestigious authors ranking ahead" is the one with the highest productivity and the highest influence; however, in the rest of the levels of analysis, the pattern with the highest productivity and the highest influence is the one with "the less productive and prestigious institutions/states/nations ranking ahead." (C) 2012 Elsevier Ltd. All rights reserved. C1 [He, Bing; Ding, Ying; Yan, Erjia] Indiana Univ, Sch Lib & Informat Sci, Bloomington, IN 47405 USA. RP He, B (reprint author), Indiana Univ, Sch Lib & Informat Sci, Bloomington, IN 47405 USA. EM binghe@indiana.edu; dingying@indiana.edu; eyan@indiana.edu RI Yan, Erjia/E-7887-2011 CR AGRAWAL R, 1995, PROC INT CONF DATA, P3, DOI 10.1109/ICDE.1995.380415 Baerlocher MO, 2007, J INVEST MED, V55, P174, DOI 10.2310/6650.2007.06044 Buchta C., 2010, ARULESSEQUENCES MINI BURMAN KD, 1982, ANN INTERN MED, V97, P602 Endersby W. 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PD JUL PY 2012 VL 6 IS 3 BP 359 EP 367 DI 10.1016/j.joi.2012.01.001 PG 9 WC Information Science & Library Science SC Information Science & Library Science GA 937LN UT WOS:000303660100002 ER PT J AU Vinkler, P AF Vinkler, Peter TI The case of scientometricians with the "absolute relative" impact indicator SO JOURNAL OF INFORMETRICS LA English DT Article DE Relative impact indicator; "crown" indicator; Relative citation rate; Relative subfield citedness ID HIGHLY CITED PAPERS; BIBLIOMETRIC INDICATORS; RESEARCH PERFORMANCE; CITATION IMPACT; CROWN INDICATOR; G-INDEX; PUBLICATIONS; UNIVERSITY; CHARTS; OUTPUT AB The effect of two different calculation methods for obtaining relative impact indicators is modelled. Science policy considerations make it clear that evaluating the sets of publications, the "ratio of the sums" method should be preferred over the "mean of the ratios" method. Accordingly, determining the relative total impact against the mean relative impact of the publications of teams or institutes may be preferred. The special problem caused by relating the number of citations of an individual article to the Garfield (Impact) Factor (or mean citedness) of the publishing journal (or a set of journals selected as standard) lower than zero is demonstrated by examples. The possible effects of the different share of publications in different fields on the value of the "new crown" index are also modelled. The assessment methods using several appropriately weighted indicators which result in a composite index are recommended. The acronym "BMV" is suggested to term the relative impact indicators (e.g. RCR, CPP/JCS(m), CPP/FCSm and RW) in scientometrics. (C) 2011 Elsevier Ltd. All rights reserved. C1 Hungarian Acad Sci, Chem Res Ctr, H-1525 Budapest, Hungary. RP Vinkler, P (reprint author), Hungarian Acad Sci, Chem Res Ctr, POB 17, H-1525 Budapest, Hungary. 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Informetr. PD APR PY 2012 VL 6 IS 2 BP 254 EP 264 DI 10.1016/j.joi.2011.12.004 PG 11 WC Information Science & Library Science SC Information Science & Library Science GA 906RF UT WOS:000301364100009 ER PT J AU Ding, Y AF Ding, Ying TI Community detection: Topological vs. topical SO JOURNAL OF INFORMETRICS LA English DT Article DE Community detection; Topics; Communities; Coauthor network ID COCITATION ANALYSIS; INFORMATION-RETRIEVAL; BIBLIOMETRIC INFORMATION; AUTHOR COCITATION; NETWORKS; SCIENCE; CITATION; TEXT AB The evolution of the Web has promoted a growing interest in social network analysis, such as community detection. Among many different community detection approaches, there are two kinds that we want to address: one considers the graph structure of the network (topology-based community detection approach); the other one takes the textual information of the network nodes into consideration (topic-based community detection approach). This paper conducted systematic analysis of applying a topology-based community detection approach and a topic-based community detection approach to the coauthorship networks of the information retrieval area and found that: (1) communities detected by the topology-based community detection approach tend to contain different topics within each community; and (2) communities detected by the topic-based community detection approach tend to contain topologically-diverse sub-communities within each community. The future community detection approaches should not only emphasize the relationship between communities and topics, but also consider the dynamic changes of communities and topics. Published by Elsevier Ltd. C1 Indiana Univ, Sch Lib & Informat Sci, Bloomington, IN 47405 USA. RP Ding, Y (reprint author), Indiana Univ, Sch Lib & Informat Sci, 1320 E 10th, Bloomington, IN 47405 USA. 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Informetr. PD OCT PY 2011 VL 5 IS 4 BP 498 EP 514 DI 10.1016/j.joi.2011.02.006 PG 17 WC Information Science & Library Science SC Information Science & Library Science GA 841PI UT WOS:000296524200002 ER PT J AU Leydesdorff, L Welbers, K AF Leydesdorff, Loet Welbers, Kasper TI The semantic mapping of words and co-words in contexts SO JOURNAL OF INFORMETRICS LA English DT Article DE Semantic; Map; Document; Text; Word; Latent; Meaning ID PEARSONS CORRELATION-COEFFICIENT; AUTHOR COCITATION ANALYSIS; COMMUNICATION; SCIENCE; ORGANIZATION; INDICATORS; NETWORKS AB Meaning can be generated when information is related at a systemic level. Such a system can be an observer, but also a discourse, for example, operationalized as a set of documents. The measurement of semantics as similarity in patterns (correlations) and latent variables (factor analysis) has been enhanced by computer techniques and the use of statistics; for example, in "latent semantic analysis". 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PD JUL PY 2011 VL 5 IS 3 BP 469 EP 475 DI 10.1016/j.joi.2011.01.008 PG 7 WC Information Science & Library Science SC Information Science & Library Science GA 769QF UT WOS:000291032500015 ER PT J AU Serenko, A Bontis, N AF Serenko, Alexander Bontis, Nick TI What's familiar is excellent: The impact of exposure effect on perceived journal quality SO JOURNAL OF INFORMETRICS LA English DT Article DE Journal ranking; Stated preference; Exposure effect; Familiarity effect ID KNOWLEDGE MANAGEMENT; ACADEMIC JOURNALS; RANKING AB The purpose of this study is to test the existence of the exposure effect in journal ranking decisions. The exposure effect emerges when participants of journal ranking surveys assign higher scores to some journals merely because they are more familiar with them rather than on their objective assessment of the overall journal's contribution to the field. Analysis of the journal ranking data from a survey of 233 active researchers in the field of knowledge management and intellectual capital confirmed the existence of the exposure effect. Specifically, it was found that: (1) those who previously published in a particular journal rated it higher than those who did not; (2) those who previously served as a reviewer or editor for a particular journal also rated it higher than those who did not; and (3) a very strong correlation was found between the respondents' perceptions of overall contribution of a journal and the degree of their familiarity with this outlet. This investigation confirmed a major limitation of the stated preference journal ranking approach that should be taken into consideration in future research and results interpretation. (C) 2010 Elsevier Ltd. All rights reserved. C1 [Serenko, Alexander] Lakehead Univ, Fac Business Adm, Thunder Bay, ON P7B 5E1, Canada. 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B., 1910, TXB PSYCHOL Tourani-Rad A., 2005, ACCOUNT FINANC, V45, P283, DOI 10.1111/j.1467-629x.2004.00131.x Truex D, 2009, J ASSOC INF SYST, V10, P560 ZAJONC RB, 1968, J PERS SOC PSYCHOL, V9, P1, DOI 10.1037/h0025848 NR 21 TC 10 Z9 10 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 1751-1577 J9 J INFORMETR JI J. Informetr. PD JAN PY 2011 VL 5 IS 1 BP 219 EP 223 DI 10.1016/j.joi.2010.07.005 PG 5 WC Information Science & Library Science SC Information Science & Library Science GA 698WS UT WOS:000285626000018 ER PT J AU Glanzel, W AF Glanzel, Wolfgang TI On reliability and robustness of scientometrics indicators based on stochastic models. An evidence-based opinion paper SO JOURNAL OF INFORMETRICS LA English DT Article DE Stochastic models; Scientometric indicators; Statistical reliability; Ranking h-Index ID CITATION PROCESSES; DISTRIBUTIONS; INFORMETRICS; OBSOLESCENCE; JOURNALS AB In the present paper we give an overview over the opportunities of probabilistic models in scientometrics. Four examples from different topics are used to shed light on some important aspects of reliability and robustness of indicators based on stochastic models. Limitations and future tasks are discussed as well. (C) 2010 Elsevier Ltd. All rights reserved. C1 [Glanzel, Wolfgang] Katholieke Univ Leuven, Ctr R&D Monitoring, Louvain, Belgium. [Glanzel, Wolfgang] Katholieke Univ Leuven, Dept MSI, Louvain, Belgium. [Glanzel, Wolfgang] Hungarian Acad Sci, Inst Res Policy Studies, Budapest, Hungary. RP Glanzel, W (reprint author), Katholieke Univ Leuven, Ctr R&D Monitoring, Louvain, Belgium. 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Informetr. PD JUL PY 2010 VL 4 IS 3 BP 313 EP 319 DI 10.1016/j.joi.2010.01.005 PG 7 WC Information Science & Library Science SC Information Science & Library Science GA 607YQ UT WOS:000278543600010 ER PT J AU Kosmulski, M AF Kosmulski, Marek TI New seniority-independent Hirsch-type index SO JOURNAL OF INFORMETRICS LA English DT Article DE Citation metrics; Hirsch-index; Hirsch-type indices; Research output ID H-INDEX; CITATION HISTORIES AB The following seniority-independent Hirsch-type index has been defined. A scientist has index hpd if hpd of his/her papers have at least hpd citations per decade each, and his/her other papers have less than hpd + 1 citations per decade each. In contrast with the original h-index, which steadily increases in time, hpd of a mature scientist is nearly constant over many years, and hpd of an inactive scientist slowly declines. Therefore hpd is suitable to compare the scientific output of scientists in different ages. (C) 2009 Elsevier Ltd. All rights reserved. C1 Lublin Univ Technol, Dept Electrochem, PL-20618 Lublin, Poland. RP Kosmulski, M (reprint author), Lublin Univ Technol, Dept Electrochem, Nadbystrzycka 38, PL-20618 Lublin, Poland. EM mkosmuls@hektor.umcs.lublin.pl RI Kosmulski, Marek/F-2326-2010; Kosmulski, Marek/B-9158-2009 CR Bornmann L, 2009, EMBO REP, V10, P2, DOI 10.1038/embor.2008.233 Egghe L, 2008, J AM SOC INF SCI TEC, V59, P1608, DOI 10.1002/asi.20845 EGGHE L, 2007, INFORM PROCESSING MA, V44, P770 EXNER O, 1995, SCIENTOMETRICS, V32, P3, DOI 10.1007/BF02020185 Glanzel W, 2007, J INFORMETR, V1, P92, DOI 10.1016/j.joi.2006.10.001 GLANZEL W, 1994, SCIENTOMETRICS, V30, P49, DOI 10.1007/BF02017212 Glanzel W, 2003, SCIENTOMETRICS, V58, P571, DOI 10.1023/B:SCIE.0000006881.30700.ea Hirsch JE, 2005, P NATL ACAD SCI USA, V102, P16569, DOI 10.1073/pnas.0507655102 Jin BH, 2007, CHINESE SCI BULL, V52, P855, DOI 10.1007/s11434-007-0145-9 Maricic S, 1998, J AM SOC INFORM SCI, V49, P530, DOI 10.1002/(SICI)1097-4571(19980501)49:6<530::AID-ASI5>3.0.CO;2-8 Schreiber M, 2008, J INFORMETR, V2, P211, DOI 10.1016/j.joi.2008.05.001 SCHREIBER M, 2007, EPL, V70, P30002 Sidiropoulos A, 2007, SCIENTOMETRICS, V72, P253, DOI 10.1007/s11192-007-1722-z Van Dalen HP, 2004, POPUL DEV REV, V30, P489 van Raan AFJ, 2004, SCIENTOMETRICS, V59, P467, DOI 10.1023/B:SCIE.0000018543.82441.f1 NR 15 TC 10 Z9 10 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 1751-1577 J9 J INFORMETR JI J. Informetr. PD OCT PY 2009 VL 3 IS 4 BP 341 EP 347 DI 10.1016/j.joi.2009.05.003 PG 7 WC Information Science & Library Science SC Information Science & Library Science GA 484VB UT WOS:000269075100008 ER PT J AU Waltman, L van Eck, NJ AF Waltman, Ludo van Eck, Nees Jan TI Some comments on Egghe's derivation of the impact factor distribution SO JOURNAL OF INFORMETRICS LA English DT Article DE Impact factor; Distribution; Rank-order distribution; Central limit theorem ID JOURNAL IMPACT AB In a recent paper, Egghe [Egghe, L. (in press). Mathematical derivation of the impact factor distribution. Journal of Informetrics] presents a mathematical analysis of the rank-order distribution of journal impact factors. The analysis is based on the central limit theorem. We criticize the empirical relevance of Egghe's analysis. More specifically, we argue that Egghe's analysis relies on an unrealistic assumption and we show that the analysis is not in agreement with empirical data. (C) 2009 Elsevier Ltd. All rights reserved. C1 [Waltman, Ludo; van Eck, Nees Jan] Erasmus Univ, Inst Econometr, Erasmus Sch Econ, NL-3000 DR Rotterdam, Netherlands. [Waltman, Ludo; van Eck, Nees Jan] Leiden Univ, Ctr Sci & Technol Studies, NL-2300 AX Leiden, Netherlands. RP Waltman, L (reprint author), Erasmus Univ, Inst Econometr, Erasmus Sch Econ, POB 1738, NL-3000 DR Rotterdam, Netherlands. EM lwaltman@ese.eur.nl; nvaneck@ese.eur.nl RI van Eck, Nees Jan/B-6042-2008 OI van Eck, Nees Jan/0000-0001-8448-4521 CR Althouse BM, 2009, J AM SOC INF SCI TEC, V60, P27, DOI 10.1002/asi.20936 Beirlant J, 2007, J INFORMETR, V1, P185, DOI 10.1016/j.joi.2007.04.002 Glanzel W, 2009, SCIENTOMETRICS, V78, P355, DOI 10.1007/s11192-008-2166-9 Mansilla R, 2007, J INFORMETR, V1, P155, DOI 10.1016/j.joi.2007.01.001 Popescu I. I., 2003, GLOTTOMETRICS, V6, P83 SCHUBERT A, 1983, SCIENTOMETRICS, V5, P59, DOI 10.1007/BF02097178 Schwartz S, 1996, SCIENTOMETRICS, V35, P119, DOI 10.1007/BF02018236 NR 7 TC 10 Z9 10 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 1751-1577 J9 J INFORMETR JI J. Informetr. PD OCT PY 2009 VL 3 IS 4 BP 363 EP 366 DI 10.1016/j.joi.2009.05.004 PG 4 WC Information Science & Library Science SC Information Science & Library Science GA 484VB UT WOS:000269075100011 ER PT J AU Coccia, M AF Coccia, Mario TI Measuring scientific performance of public research units for strategic change SO JOURNAL OF INFORMETRICS LA English DT Article DE scientometrics; public research institutes; scientific performance ID AUSTRALIAN ECONOMICS DEPARTMENTS; HIGHER-EDUCATION; BUREAUCRATIZATION; PRODUCTIVITY; INDICATORS; RANKING; MODEL AB This research presents a new metrics to measure and assess the scientific performance of public research institutes, which improves models based on standard multivariate techniques. These models called Research Lab Evaluation (RELEV) adjusted are successfully applied to Italian public research institutes, operating in five scientific fields. In addition, the paper presents a comparison between this method and the Data Envelopment Analysis to show some analogies and differences in the results. (C) 2008 Elsevier Ltd. All rights reserved. RP Coccia, M (reprint author), Inst Econ Res Firm & Growth, CNR, CERIS, Collegio Carlo Alberto Via Real Collegio N 30, I-10024 Turin, Italy. 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R., 1986, MEASURING EFFICIENCY TORRESSALINAS D, 2007, P ISSSI 2007 Silvani A, 2005, RES EVALUAT, V14, P207, DOI 10.3152/147154405781776094 VANRAAN AFJ, 1988, HDB SCI TECHNOLOGY I VILKAS C, 2004, REV HIST CNRS, V11 NR 36 TC 10 Z9 10 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 1751-1577 J9 J INFORMETR JI J. Informetr. PD JUL PY 2008 VL 2 IS 3 BP 183 EP 194 DI 10.1016/j.joi.2008.04.001 PG 12 WC Information Science & Library Science SC Information Science & Library Science GA 327ZQ UT WOS:000257767400002 ER PT J AU Soler, JM AF Soler, Jose M. TI A rational indicator of scientific creativity SO JOURNAL OF INFORMETRICS LA English DT Article DE citation analysis; citation network; knowledge flow; research merit; scientific creativity ID SCIENCE CITATION INDEX; PHYSICS AB A model is proposed for the creation and transmission of scientific knowledge, based on the network of citations among research articles. The model allows to assign to each article a non-negative value for its creativity, i.e. its creation of new knowledge. If the entire publication network is truncated to the first neighbors of an article (the n references that it makes and the m citations that it receives), its creativity value becomes a simple function of n and m. After splitting the creativity of each article among its authors, the cumulative creativity of an author is then proposed as an indicator of her or his merit of research. In contrast with other merit indicators, this creativity index yields similar values for the top scientists in two very different areas (life sciences and physics), thus offering good promise for interdisciplinary analyses. (c) 2007 Elsevier Ltd. All rights reserved. C1 Univ Autonoma Madrid, Dept Fis Mat Condensada, C III, E-28049 Madrid, Spain. RP Soler, JM (reprint author), Univ Autonoma Madrid, Dept Fis Mat Condensada, C III, Cantoblanco, E-28049 Madrid, Spain. EM jose.soler@uam.es RI Soler, Jose/B-6253-2008 OI Soler, Jose/0000-0003-1046-7221 CR Albert R, 2002, REV MOD PHYS, V74, P47, DOI 10.1103/RevModPhys.74.47 CHEN P, 2006, ARXIVPHYSICS0604130 COLE J, 1971, AM SOCIOL, V6, P23 COZZENS SE, 1989, SCIENTOMETRICS, V15, P437, DOI 10.1007/BF02017064 GARFIELD E, 1964, SCIENCE, V144, P649, DOI 10.1126/science.144.3619.649 GILBERT GN, 1977, SOC STUD SCI, V7, P113 Gradshteyn I S, 1980, TABLE INTEGRALS SERI Hirsch JE, 2005, P NATL ACAD SCI USA, V102, P16569, DOI 10.1073/pnas.0507655102 MERTON RK, 1968, SCIENCE, V159, P56, DOI 10.1126/science.159.3810.56 MOED HF, 2005, CHITATION ANAL RES E Narin F, 1997, RES POLICY, V26, P317, DOI 10.1016/S0048-7333(97)00013-9 PINSKI G, 1976, INFORM PROCESS MANAG, V12, P297, DOI 10.1016/0306-4573(76)90048-0 Redner S, 2005, PHYS TODAY, V58, P49, DOI 10.1063/1.1996475 Rinia EJ, 1998, RES POLICY, V27, P95, DOI 10.1016/S0048-7333(98)00026-2 Rinia EJ, 2002, SCIENTOMETRICS, V54, P347, DOI 10.1023/A:1016078331752 TRIBUS M, 1969, RATIONAL DESCRIPTION NR 16 TC 10 Z9 11 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 1751-1577 J9 J INFORMETR JI J. Informetr. PD APR PY 2007 VL 1 IS 2 BP 123 EP 130 DI 10.1016/j.joi.2006.10.004 PG 8 WC Information Science & Library Science SC Information Science & Library Science GA 269JI UT WOS:000253644900003 ER PT J AU Han, YJ AF Han, Yoo-Jin TI Measuring industrial knowledge stocks with patents and papers SO JOURNAL OF INFORMETRICS LA English DT Article DE industrial knowledge stock; patents; papers; the USPTO web site; the SCI database ID PRODUCTIVITY GROWTH; SCIENCE; FLOWS AB Under the National Innovation System (NIS) framework, knowledge stock has been recognized as a key factor for enhancing national innovative capabilities. However, despite the importance of patents and papers for measuring knowledge, previous research has not fully utilized patent and paper databases, and has instead relied on research and development (R&D) data. Therefore, in this research, I introduce a way to utilize both types of useful data when measuring industrial knowledge stocks. As primary data sources, the United States Patent and Trademark Office (USPTO) Web site for patents and the science citation index (SCI) for papers are used. In the case of Korea, the amount of knowledge stock proxied by patents and papers is different from that proxied by R&D, which indicates in turn that using a single indicator such as R&D may be misleading. Although the result may vary depending on the selected nation, the proposed method will be useful for gauging knowledge stocks in a more complementary way. (c) 2007 Elsevier Ltd. All rights reserved. C1 Korea Inst Intellectual Property, Seoul 135980, South Korea. RP Han, YJ (reprint author), Korea Inst Intellectual Property, 3th FL,647-9, Seoul 135980, South Korea. EM yjhan@kiip.re.kr CR Abdih Y, 2006, IMF STAFF PAPERS, V53, P242 Archibugi D, 1996, TECHNOVATION, V16, P451, DOI 10.1016/0166-4972(96)00031-4 Breschi S, 1997, SYSTEMS INNOVATION T, P130 Criscuolo P, 2006, SCIENTOMETRICS, V66, P23, DOI 10.1007/s11192-006-0003-6 GRILICHES Z, 1979, BELL J ECON, V10, P92, DOI 10.2307/3003321 Hall B. H., 2001, 8498 NBER HICKS D, 1996, C NEW S T IND KNOWL Kleinknecht A, 2002, EC INNOVATION NEW TE, V11, P109, DOI 10.1080/10438590210899 LACH S, 1995, ECON LETT, V49, P101, DOI 10.1016/0165-1765(94)00618-C MANSFIELD E, 1980, AM ECON REV, V70, P863 MARLERBA F, 2002, RES POLICY, V31, P247 Metcalfe JS, 2005, FUTURES, V37, P655, DOI 10.1016/j.futures.2004.11.006 Meyer M, 2002, SCIENTOMETRICS, V54, P193, DOI 10.1023/A:1016057727209 Moon HS, 2005, SCIENTOMETRICS, V64, P67, DOI 10.1007/s11192-005-0238-7 NELSON R, 1998, DYNAMIC FIRM, P45 OECD, 1996, KNOWL BAS EC OKUBO Y, 1997, 19971 OECD STI Park G, 2006, TECHNOL FORECAST SOC, V73, P793, DOI 10.1016/j.techfore.2005.09.006 PAVITT K, 1984, RES POLICY, V13, P343, DOI 10.1016/0048-7333(84)90018-0 ROSENBERG N, 1994, RES POLICY, V23, P323, DOI 10.1016/0048-7333(94)90042-6 SCHERER FM, 1982, REV ECON STAT, V64, P627, DOI 10.2307/1923947 SMALL H, 1985, J INFORM SCI, V11, P147, DOI 10.1177/016555158501100402 Watanabe C, 2001, TECHNOVATION, V21, P783, DOI 10.1016/S0166-4972(01)00025-6 Wouters P, 1998, SCIENTOMETRICS, V41, P225, DOI 10.1007/BF02457980 NR 24 TC 10 Z9 10 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 1751-1577 J9 J INFORMETR JI J. Informetr. PY 2007 VL 1 IS 4 BP 269 EP 276 DI 10.1016/j.joi.2007.06.001 PG 8 WC Information Science & Library Science SC Information Science & Library Science GA 272BF UT WOS:000253831900002 ER PT J AU Bornmann, L Leydesdorff, L AF Bornmann, Lutz Leydesdorff, Loet TI Which are the best performing regions in information science in terms of highly cited papers? Some improvements of our previous mapping approaches SO JOURNAL OF INFORMETRICS LA English DT Article DE Scientific excellence; Highly cited papers; I3; Geography of science; Spatial scientometrics; Google map ID RELATIVE INDICATORS; IMPACT FACTOR; GEOGRAPHY; PUBLICATION; CITIES; CHARTS; MAPS AB Bornmann and Leydesdorff (2011) proposed methods based on Web of Science data to identify field-specific excellence in cities where highly cited papers were published more frequently than can be expected. Top performers in output are cities in which authors are located who publish a number of highly cited papers that is statistically significantly higher than can be expected for these cities. Using papers published between 1989 and 2009 in information science improvements to the methods of Bornmann and Leydesdorff (2011) are presented and an alternative mapping approach based on the Integrated Impact Indicator (I3) is introduced here. The I3 indicator was developed by Leydesdorff and Bornmann (2011b). (C) 2011 Elsevier Ltd. All rights reserved. C1 [Bornmann, Lutz] Max Planck Gesell, D-80539 Munich, Germany. [Leydesdorff, Loet] Univ Amsterdam, Amsterdam Sch Commun Res, NL-1012 CX Amsterdam, Netherlands. RP Bornmann, L (reprint author), Max Planck Gesell, Hofgartenstr 8, D-80539 Munich, Germany. EM bornmann@gv.mpg.de; loet@leydesdorff.net RI Bornmann, Lutz/A-3926-2008; Leydesdorff, Loet/E-2903-2010 OI Bornmann, Lutz/0000-0003-0810-7091; Leydesdorff, Loet/0000-0002-7835-3098 CR Australian Research Council, 2011, ERA 2010 CIT BENCHM Bornmann L, 2011, J INFORMETR, V5, P537, DOI 10.1016/j.joi.2011.05.005 Bornmann L, 2011, J R STAT SOC A STAT, V174, P857, DOI 10.1111/j.1467-985X.2011.00689.x Bornmann L, 2011, J AM SOC INF SCI TEC, V62, P1954, DOI 10.1002/asi.21611 Bornmann L, 2011, J INFORMETR, V5, P547, DOI 10.1016/j.joi.2011.04.006 Bornmann L, 2011, J INFORMETR, V5, P228, DOI 10.1016/j.joi.2010.10.009 Garcia SM, 2009, PSYCHOL SCI, V20, P871, DOI 10.1111/j.1467-9280.2009.02385.x Garfield E, 2006, JAMA-J AM MED ASSOC, V295, P90, DOI 10.1001/jama.295.1.90 GARFIELD E, 1979, SCIENTOMETRICS, V1, P359, DOI 10.1007/BF02019306 Gingras Y, 2011, J INFORMETR, V5, P226, DOI 10.1016/j.joi.2010.10.005 Glanzel W, 2009, SCIENTOMETRICS, V78, P165, DOI 10.1007/s11192-008-2109-5 KATZ JS, 1994, SCIENTOMETRICS, V31, P31, DOI 10.1007/BF02018100 Leydesdorff L, 2011, J AM SOC INF SCI TEC, V62, P217, DOI 10.1002/asi.21450 Leydesdorff L, 2010, J AM SOC INF SCI TEC, V61, P1622, DOI 10.1002/asi.21347 Leydesdorff L, 2011, J AM SOC INF SCI TEC, V62, P2133, DOI 10.1002/asi.21609 Moed HF, 2010, J INFORMETR, V4, P265, DOI 10.1016/j.joi.2010.01.002 MOED HF, 1995, SCIENTOMETRICS, V33, P381, DOI 10.1007/BF02017338 National Science Board, 2010, 1001 NSB NAT SCI FDN Opthof T, 2010, J INFORMETR, V4, P423, DOI 10.1016/j.joi.2010.02.003 Ozimek A, 2011, STATA J, V11, P106 Rousseau R, 2012, J AM SOC INF SCI TEC, V63, P416, DOI 10.1002/asi.21684 SCHUBERT A, 1986, SCIENTOMETRICS, V9, P281, DOI 10.1007/BF02017249 Sheskin D. J., 2007, HDB PARAMETRIC NONPA Van Noorden Richard, 2010, Nature, V467, P906, DOI 10.1038/467906a NR 24 TC 9 Z9 9 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 1751-1577 J9 J INFORMETR JI J. Informetr. PD APR PY 2012 VL 6 IS 2 BP 336 EP 345 DI 10.1016/j.joi.2011.11.002 PG 10 WC Information Science & Library Science SC Information Science & Library Science GA 906RF UT WOS:000301364100018 ER PT J AU Kuan, CH Huang, MH Chen, DZ AF Kuan, Chung-Huei Huang, Mu-Hsuan Chen, Dar-Zen TI Positioning research and innovation performance using shape centroids of h-core and h-tail SO JOURNAL OF INFORMETRICS LA English DT Article DE Rank-citation curve; h-Core; h-Tail; Shape centroid; Patentometrics; Bibliometrics ID INDEX; IMPACT; OUTPUT AB We propose a novel yet practical method capturing an individual's research or innovation performance by the shape centroids of the h-core and h-tail areas of its publications or patents. A large number of individuals' relative performance with respect to their h-cores and h-tails can be simultaneously positioned and conveniently observed in two-dimensional coordinate systems. Two approaches are further proposed to the utilization of the two-dimensional distribution of shape centroids. The first approach specifically determines, within a group of individuals, those outperforming or being outperformed by a target individual. The second approach provides a quick qualitative categorization of the individuals so that the nature of their performance is revealed. Using patent assignees as an illustrative case, the approaches are tested with empirical patent assignee data. Crown Copyright (C) 2011 Published by Elsevier Ltd. All rights reserved. C1 [Kuan, Chung-Huei; Chen, Dar-Zen] Natl Taiwan Univ, Dept Mech Engn, Taipei 10617, Taiwan. [Huang, Mu-Hsuan] Natl Taiwan Univ, Dept Lib & Informat Sci, Taipei 10617, Taiwan. [Chen, Dar-Zen] Natl Taiwan Univ, Inst Ind Engn, Taipei 10617, Taiwan. RP Chen, DZ (reprint author), Natl Taiwan Univ, Dept Mech Engn, 1,Sec 4,Roosevelt Rd, Taipei 10617, Taiwan. EM d98522047@ntu.edu.tw; mhhuang@ntu.edu.tw; dzchen@ntu.edu.tw RI Chen, Dar-Zen/D-1463-2012 OI Chen, Dar-Zen/0000-0002-7734-4835 CR Alonso S, 2009, J INFORMETR, V3, P273, DOI 10.1016/j.joi.2009.04.001 Anderson TR, 2008, SCIENTOMETRICS, V76, P577, DOI 10.1007/s11192-007-2071-2 Bornmann L, 2008, J AM SOC INF SCI TEC, V59, P830, DOI 10.1002/asi.20806 Bornmann L, 2010, J INFORMETR, V4, P407, DOI 10.1016/j.joi.2010.03.005 Bornmann L, 2009, EMBO REP, V10, P2, DOI 10.1038/embor.2008.233 Cabrerizo FJ, 2010, J INFORMETR, V4, P23, DOI 10.1016/j.joi.2009.06.005 Egghe L, 2010, ANNU REV INFORM SCI, V44, P65 Egghe L, 2006, SCIENTOMETRICS, V69, P131, DOI 10.1007/s11192-006-0144-7 Egghe L., 2006, ISSI NEWSLETTER, V2, P8 Egghe L, 2010, J INFORMETR, V4, P14, DOI 10.1016/j.joi.2009.06.001 Garcia-Perez MA, 2009, SCIENTOMETRICS, V81, P779, DOI 10.1007/s11192-009-2290-1 GLANZEL W, 1988, J INFORM SCI, V14, P123, DOI 10.1177/016555158801400208 Hirsch JE, 2005, P NATL ACAD SCI USA, V102, P16569, DOI 10.1073/pnas.0507655102 Huang M.H., 2010, J LIB INFORM STUDIES, V8, P1 Jin B., 2007, ISSI NEWSLETTER, V3, P6 Jin BH, 2007, CHINESE SCI BULL, V52, P855, DOI 10.1007/s11434-007-0145-9 Kosmulski M., 2006, ISSI NEWSLETTER, V2, P4 Kuan CH, 2011, J INFORMETR, V5, P303, DOI 10.1016/j.joi.2011.01.002 Rousseau R., 2006, SCI FOCUS, V1, P23 THOR A, DATABASE GROUP LEIPZ *US PAT TRAD OFF, 2010, PAT ORG 2009 van Eck NJ, 2008, J INFORMETR, V2, P263, DOI 10.1016/j.joi.2008.09.004 Wu Q, 2010, J AM SOC INF SCI TEC, V61, P609, DOI 10.1002/asi.21276 Ye FY, 2010, SCIENTOMETRICS, V84, P431, DOI 10.1007/s11192-009-0099-6 Ye F.Y., 2010, J LIB INFORM STUDIES, V8, P1 Zhang CT, 2009, PLOS ONE, V4, DOI 10.1371/journal.pone.0005429 NR 26 TC 9 Z9 9 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 1751-1577 J9 J INFORMETR JI J. Informetr. PD OCT PY 2011 VL 5 IS 4 BP 515 EP 528 DI 10.1016/j.joi.2011.04.003 PG 14 WC Information Science & Library Science SC Information Science & Library Science GA 841PI UT WOS:000296524200003 ER PT J AU Moed, HF de Moya-Anegon, F Lopez-Illescas, C Visser, M AF Moed, Henk F. de Moya-Anegon, Felix Lopez-Illescas, Carmen Visser, Martijn TI Is concentration of university research associated with better research performance? SO JOURNAL OF INFORMETRICS LA English DT Article DE University rankings; Citation analysis; Research performance; Research concentration; Disciplinary specialization; National academic systems; Scopus ID ONCOLOGY; RANKINGS AB This paper analyses relationships between university research performance and concentration of university research. Using the number of publications and their citation impact extracted from Scopus as proxies of research activity and research performance, respectively, it examines at a national level for 40 major countries the distribution of published research articles among its universities, and at an institutional level for a global set of 1500 universities the distribution of papers among 16 main subject fields. Both at a national and an institutional level it was found that a larger publication output is associated with a higher citation impact. If one conceives the number of publications as a measure of concentration, this outcome indicates that, in university research, concentration and performance are positively related, although the underlying causal relationships are complex. But a regression analysis found no evidence that more concentration of research among a country's universities or among an institution's main fields is associated with better overall performance. The study reveals a tendency that the research in a particular subject field conducted in universities specializing in other fields outperforms the work in that field in institutions specializing in that field. This outcome may reflect that it is multi-disciplinary research that is the most promising and visible at the international research front, and that this type of research tends to develop better in universities specializing in a particular domain and expanding their capabilities in that domain towards other fields. (C) 2011 Elsevier Ltd. All rights reserved. C1 [Moed, Henk F.] Elsevier, NL-1043 NX Amsterdam, Netherlands. [de Moya-Anegon, Felix; Lopez-Illescas, Carmen] Spanish Natl Res Council, CSIC, CCHS Inst, IPP,SCImago Unit, Madrid, Spain. [Visser, Martijn] Leiden Univ, Ctr Sci & Technol Studies CWTS, NL-2300 RA Leiden, Netherlands. RP Moed, HF (reprint author), Elsevier, Radarweg 29, NL-1043 NX Amsterdam, Netherlands. EM h.moed@elsevier.com; felix.moya@scimago.es; carmenlillescas@cchs.csic.es; visser@cwts.leidenuniv.nl RI Moya Anegon, Felix/C-4004-2009 OI Moya Anegon, Felix/0000-0002-0255-8628 CR AUBR, 2010, EXP GROUP ASS U BAS Brusoni S, 2004, HANDBOOK OF QUANTITATIVE SCIENCE AND TECHNOLOGY RESEARCH: THE USE OF PUBLICATION AND PATENT STATISTICS IN STUDIES OF S&T SYSTEMS, P733 Calero-Medina C, 2008, RES EVALUAT, V17, P71, DOI 10.3152/095820208X280907 CEPES, 2006, BERL PRINC RANK HIGH Egghe L., 1990, INTRO INFORMETRICS Hicks D., 2010, PERFORMANCE BASED FU Liu N.C., 2005, HIGHER ED EUROPE, V30, P127 Liu NC, 2005, HIGHER ED EUROPE, V30, P127, DOI DOI 10.1080/03797720500260116 Lopez-Illescas C, 2009, J INF SCI, V35, P244, DOI 10.1177/0165551508098603 Lopez-Illescas C., 2011, RANKING U SHOU UNPUB OECD, 2010, PERF BAS FUND PUBL R Rousseau R., 1992, THESIS U ANTWERP Salmi J, 2009, DIR DEV, P1, DOI 10.1596/978-0-8213-7865-6 SCImago, 2010, SIR 2009 WORLD REP Scopus, 2010, WHAT DOES IT COV SJTU, 2007, AC RANK WORLD U Van Raan AFJ, 2005, SCIENTOMETRICS, V62, P133, DOI 10.1007/s11192-005-0008-6 Von Tunzelmann N., 2003, EFFECTS SIZE RES PER NR 18 TC 9 Z9 9 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 1751-1577 J9 J INFORMETR JI J. Informetr. PD OCT PY 2011 VL 5 IS 4 BP 649 EP 658 DI 10.1016/j.joi.2011.06.003 PG 10 WC Information Science & Library Science SC Information Science & Library Science GA 841PI UT WOS:000296524200015 ER PT J AU Hu, XJ Rousseau, R Chen, J AF Hu, Xiaojun Rousseau, Ronald Chen, Jin TI On the definition of forward and backward citation generations SO JOURNAL OF INFORMETRICS LA English DT Article DE Citation generations; Direct and indirect influence; Web of Science; Generating function ID PUBLICATIONS; INDEX AB A publication exerts direct and indirect influence on other articles (by citing articles and by articles that cite citing articles) and is itself influenced directly as well as indirectly (by references and references of references). This citation network leads to generations of citing and cited publications. In this contribution we show that these generations can be defined in different ways. We also propose methods to calculate indicators derived from these citation generations. We claim that, when studying a publication's contribution to the evolution of its field or to science in general, taking only direct citations into account, tells only part of the story. (C) 2010 Elsevier Ltd. All rights reserved. C1 [Hu, Xiaojun; Chen, Jin] Zhejiang Univ, Coll Publ Adm, Hangzhou 310027, Peoples R China. [Hu, Xiaojun] Zhejiang Univ, Sch Med, Med Informat Ctr, Hangzhou 310058, Zhejiang, Peoples R China. [Rousseau, Ronald] KHBO Assoc KU Leuven, B-8400 Oostende, Belgium. [Rousseau, Ronald] Univ Antwerp, IBW, B-2000 Antwerp, Belgium. RP Chen, J (reprint author), Zhejiang Univ, Coll Publ Adm, 38 Zheda Rd, Hangzhou 310027, Peoples R China. 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PD JAN PY 2011 VL 5 IS 1 BP 27 EP 36 DI 10.1016/j.joi.2010.07.004 PG 10 WC Information Science & Library Science SC Information Science & Library Science GA 698WS UT WOS:000285626000003 ER PT J AU Franceschini, F Maisano, D AF Franceschini, Fiorenzo Maisano, Domenico TI The citation triad: An overview of a scientist's publication output based on Ferrers diagrams SO JOURNAL OF INFORMETRICS LA English DT Article DE Citations; h-Index; Tapered h-index; Ferrers diagram; Durfee square; Big hit; Sleeping beauty; Publication output ID H-INDEX; HIRSCH-INDEX; BIBLIOMETRIC INDICATORS; SCIENCE AB In a recent work by Anderson, Hankin, and Killworth (2008), Ferrers diagrams and Durfee squares are used to represent the scientific output of a scientist and construct a new h-based bibliometric indicator, the tapered h-index (h(T)). In the first part of this paper we examine h(T), identifying its main drawbacks and weaknesses: an arbitrary scoring system and an illusory increase in discrimination power compared to h. Subsequently, we propose a new bibliometric tool, the citation triad (CT), that better exploits the information contained in a Ferrers diagram, giving a synthetic overview of a scientist's publication output. The advantages of this new approach are discussed in detail. Argument is supported by several examples based on empirical data. (C) 2010 Elsevier Ltd. All rights reserved. C1 [Franceschini, Fiorenzo; Maisano, Domenico] Politecn Torino, Dipartimento Sistemi Prod & Econ Azienda DISPEA, I-10129 Turin, Italy. RP Franceschini, F (reprint author), Politecn Torino, Dipartimento Sistemi Prod & Econ Azienda DISPEA, Corso Duca Abruzzi 24, I-10129 Turin, Italy. 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Informetr. PD OCT PY 2010 VL 4 IS 4 BP 503 EP 511 DI 10.1016/j.joi.2010.05.004 PG 9 WC Information Science & Library Science SC Information Science & Library Science GA 647KA UT WOS:000281616200006 ER PT J AU Mallig, N AF Mallig, Nicolai TI A relational database for bibliometric analysis SO JOURNAL OF INFORMETRICS LA English DT Article DE Bibliometrics; Relational database; SQL ID CITATION ANALYSIS; RESEARCH PERFORMANCE; INDICATORS; SCIENCE AB In this article a relational database schema for a bibliometric database is developed. After the introduction explaining the motivation to use relational databases in bibliometrics, an overview of the related literature is given. A review of typical bibliometric questions serves as an informal requirement analysis. The database schema is developed as an entity-relationship diagram using the structural information typically found in scientific articles. 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This paper contributes to the growing study on the relationship between patenting and publishing among faculty members with China's evidence in the field of nanotechnology. Data from top 32 most prolific universities in patenting are used to examine the relationship, consisting of 6321 confirmed academic inventors who both publish and patent over the time period 1991-2008. By controlling for heterogeneity of patenting activities, patenting experience, institutional affiliation and collaboration with foreign researchers, the findings in China's nanotechnology generally support earlier investigations concluding that patenting activity does not adversely affect research output. Patenting, however, has negative impacts on both quantity and quality of university researchers' publication output, when the assignee lists include corporations or scientists themselves. (C) 2010 Elsevier Ltd. All rights reserved. C1 [Guan, Jiancheng] Fudan Univ, Sch Management, Shanghai 200433, Peoples R China. 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Informetr. PD JUL PY 2010 VL 4 IS 3 BP 338 EP 350 DI 10.1016/j.joi.2010.02.002 PG 13 WC Information Science & Library Science SC Information Science & Library Science GA 607YQ UT WOS:000278543600013 ER PT J AU Glanzel, W Schubert, A AF Glanzel, Wolfgang Schubert, Andras TI Hirsch-type characteristics of the tail of distributions. The generalised h-index SO JOURNAL OF INFORMETRICS LA English DT Article DE h-Index; g-Index; Ordered statistics ID EGGHES G-INDEX AB In this paper a generalisation of the h-index and g-index is given on the basis of nonnegative real-valued functionals defined on subspaces of the vector space generated by the ordered samples. Several Hirsch-type measures are defined and their basic properties are analysed. Empirical properties are illustrated using examples from the micro- and meso-level. Among these measures, the h-index proved the most, the arithmetic and geometric g-indices, the least robust measures. The mu-index and the harmonic g-index provide more balanced results and are still robust enough. (C) 2009 Elsevier Ltd. All rights reserved. C1 [Glanzel, Wolfgang] Katholieke Univ Leuven, Ctr R&D Monitoring, B-3000 Louvain, Belgium. [Glanzel, Wolfgang] Katholieke Univ Leuven, Dept MSI, B-3000 Louvain, Belgium. [Glanzel, Wolfgang; Schubert, Andras] Hungarian Acad Sci, Inst Res Policy Studies, Budapest, Hungary. RP Glanzel, W (reprint author), Katholieke Univ Leuven, Ctr R&D Monitoring, Dekenstr 2, B-3000 Louvain, Belgium. 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PD JAN PY 2010 VL 4 IS 1 BP 118 EP 123 DI 10.1016/j.joi.2009.10.002 PG 6 WC Information Science & Library Science SC Information Science & Library Science GA 530ZI UT WOS:000272631100013 ER PT J AU Gao, X Guan, JC AF Gao, Xia Guan, Jiancheng TI A scale-independent analysis of the performance of the Chinese innovation system SO JOURNAL OF INFORMETRICS LA English DT Article DE Scale-independence; National innovation system; Performance ID SCIENCE SYSTEM; INDICATORS; COLLABORATION; IMPACT; RULES AB In this paper we use scale-independent indicators to explore the performance of the Chinese innovation system from an economic and from a science and technology point of view, and compare it with 21 other nations. Some important developments in the Chinese innovation system, hidden by rankings by conventional performance indicators, were revealed. We find that gross domestic expenditure on R&D (GERD) & gross domestic product (GDP) and GDP & POP (population) all exhibit strong 'Matthew effects', measured by their scaling factors. This means that the Chinese R&D intensity (GERD/GDP) and national wealth (GDP per capita) are growing significantly with the increase of the GDP. Also pairs such as citations & papers, papers & GDP, citations & GDP, and paper & GERD exhibit these 'Matthew effects'. This observation points to the fact that in China scientific outputs and impacts are growing faster than economic growth and research investment. However, according to another scale-independent indicator, namely the adjusted relative citation impact (ARCI), China ranks on the bottom of the list, but the growth rate of the ARCI is the highest among these countries (comparing the periods 1995-1999 and 2001-2005). To sum up, we interpret these findings to mean that the scientific outputs and impacts of China show a real tendency of catching up with its economic growth. It is expected that with an increase of its GDP and R&D intensity China will show a sustained increase in indicators related to science and technology. Similarly, there are very strong 'Matthew effects' between the outputs of technology (patents) and economic growth and research investment. This means that the outputs of technology are expected to increase considerably with an increase of GDP and R&D expenditure. Furthermore, in the Chinese innovation system the government intramural expenditure on R&D (GOVERD) has a stronger non-linear impact on patent productivity than business enterprise expenditure on R&D (BERD). This shows that in China research institutions financed by the government play a more important role than enterprises. (C) 2009 Elsevier Ltd. All rights reserved. C1 [Guan, Jiancheng] Fudan Univ, Sch Management, Shanghai 200433, Peoples R China. [Gao, Xia] Beijing Univ Aeronaut & Astronaut, Sch Management, Beijing 100083, Peoples R China. [Gao, Xia] Inner Mongolia Univ, Sch Econ & Management, Hohhot, Peoples R China. RP Guan, JC (reprint author), Fudan Univ, Sch Management, Shanghai 200433, Peoples R China. EM guanjianch@buaa.edu.cn CR Bhattacharya S, 2004, SCIENTOMETRICS, V61, P361, DOI 10.1023/B:SCIE.0000045115.23375.50 Christensen K, 2002, P NATL ACAD SCI USA, V99, P2509, DOI 10.1073/pnas.012581099 Criscuolo P, 2006, SCIENTOMETRICS, V66, P23, DOI 10.1007/s11192-006-0003-6 FURMAN JF, 2002, RES POLICY, V31, P107 Godin B, 2005, MEASUREMENT STAT SCI GRILICHES Z, 1990, J ECON LIT, V28, P1661 Hu MC, 2005, RES POLICY, V34, P1322, DOI 10.1016/j.respol.2005.04.009 Jin B., 2005, P ISSI 2005, P362 JIN BH, 2005, EVALUATION MANAGEMEN, V3, P3 Jonkers K, 2008, SCIENTOMETRICS, V77, P309, DOI 10.1007/s11192-007-1971-x Katz J. 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PD OCT PY 2009 VL 3 IS 4 BP 321 EP 331 DI 10.1016/j.joi.2009.04.004 PG 11 WC Information Science & Library Science SC Information Science & Library Science GA 484VB UT WOS:000269075100006 ER PT J AU Bornmann, L Mutz, R Daniel, HD AF Bornmann, Lutz Mutz, Ruediger Daniel, Hans-Dieter TI How to detect indications of potential sources of bias in peer review: A generalized latent variable modeling approach exemplified by a gender study SO JOURNAL OF INFORMETRICS LA English DT Article DE Grant peer review; Gender bias; Gender effect; Gender differences ID PREDICTIVE-VALIDITY; DECISIONS; SELECTION; FAIRNESS AB The universalism norm of the ethos of science requires that contributions to science are not excluded because of the contributors' gender, nationality, social status, or other irrelevant criteria. Here, a generalized latent variable modeling approach is presented that grant program managers at a funding organization can use in order to obtain indications of potential sources of bias in their peer review process (such as the applicants' gender). To implement the method, the data required are the number of approved and number of rejected applicants for grants among different groups (for example, women and men or natural and social scientists). Using the generalized latent variable modeling approach indications of potential sources of bias can be examined not only for grant peer review but also for journal peer review. (C) 2008 Elsevier Ltd. All rights reserved. C1 [Bornmann, Lutz; Mutz, Ruediger] ETH, Swiss Fed Inst Technol, CH-8092 Zurich, Switzerland. [Daniel, Hans-Dieter] Univ Zurich, Evaluat Off, CH-8006 Zurich, Switzerland. RP Bornmann, L (reprint author), ETH, Swiss Fed Inst Technol, Zahringerstr 24, CH-8092 Zurich, Switzerland. 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K., 1942, J LEGAL POLITICAL SO, V1, P115 Wessely S, 1998, LANCET, V352, P301, DOI 10.1016/S0140-6736(97)11129-1 NR 10 TC 9 Z9 9 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 1751-1577 J9 J INFORMETR JI J. Informetr. PD OCT PY 2008 VL 2 IS 4 BP 280 EP 287 DI 10.1016/j.joi.2008.09.003 PG 8 WC Information Science & Library Science SC Information Science & Library Science GA 372LS UT WOS:000260903700003 ER PT J AU Egghe, L AF Egghe, L. TI General evolutionary theory of information production processes and applications to the evolution of networks SO JOURNAL OF INFORMETRICS LA English DT Article DE evolution; IPP; information production process; Lotka; Zipf; network AB Evolution of information production processes (IPPs) can be described by a general transformation function for the sources and for the items. It generalises the Fellman-Jakobsson transformation which only works on the items. In this paper the dual informetric theory of this double transformation, defined by the rank-frequency function, is described by, e.g. determining the new size-frequency function. The special case of power law transformations is studied thereby showing that a Lotkaian system is transformed into another Lotkaian system, described by a new Lotka exponent. We prove that the new exponent is smaller (larger) than the original one if and only if the change in the sources is smaller (larger) than that of the items. Applications to the study of the evolution of networks are given, including cases of deletion of nodes and/or links but also applications to other fields are given. (c) 2007 Elsevier Ltd. All rights reserved. C1 [Egghe, L.] Univ Hasselt, B-3590 Diepenbeek, Belgium. [Egghe, L.] Univ Antwerp, B-2610 Antwerp, Belgium. RP Egghe, L (reprint author), Univ Hasselt, Campus Diepenbeek, B-3590 Diepenbeek, Belgium. 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PD APR PY 2007 VL 1 IS 2 BP 115 EP 122 DI 10.1016/j.joi.2006.10.003 PG 8 WC Information Science & Library Science SC Information Science & Library Science GA 269JI UT WOS:000253644900002 ER PT J AU Rousseau, R Garcia-Zorita, C Sanz-Casado, E AF Rousseau, Ronald Garcia-Zorita, Carlos Sanz-Casado, Elias TI The h-bubble SO JOURNAL OF INFORMETRICS LA English DT Article DE h-Index; Over-citation; Hypes; Information science journals and researchers ID HIRSCH-TYPE INDEXES; SCIENTIFIC-RESEARCH OUTPUT; RANKING; JOURNALS AB Hypes occur in every domain of human behavior, including scientific research. We show in this contribution that journals and authors who studied the h-index benefited in terms of short-term citations. As, moreover, the introduction of the h-index is more a 'clever find' than a first rate intellectual achievement, its rise can be compared to a stock market bubble. (c) 2012 Elsevier Ltd. All rights reserved. C1 [Rousseau, Ronald] KHBO Assoc KU Leuven, Fac Engn Technol, B-8400 Oostende, Belgium. [Rousseau, Ronald] Katholieke Univ Leuven, Dept Math, B-3000 Heverlee, Belgium. [Rousseau, Ronald] Univ Antwerp, IBW, B-2000 Antwerp, Belgium. [Garcia-Zorita, Carlos; Sanz-Casado, Elias] Univ Carlos III Madrid, LEMI, Associated Unit IEDCYT LEMI, Madrid 28903, Spain. RP Sanz-Casado, E (reprint author), Univ Carlos III Madrid, LEMI, Associated Unit IEDCYT LEMI, C Madrid 126, Madrid 28903, Spain. 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PY 2013 VL 7 IS 2 BP 294 EP 300 DI 10.1016/j.joi.2012.11.012 PG 7 WC Information Science & Library Science SC Information Science & Library Science GA 136PY UT WOS:000318377100006 ER PT J AU Herranz, N Ruiz-Castillo, J AF Herranz, Neus Ruiz-Castillo, Javier TI Sub-field normalization in the multiplicative case: Average-based citation indicators SO JOURNAL OF INFORMETRICS LA English DT Article DE Citation analysis; Web of Science categories; Journal classification; Research performance; Normalization; European paradox ID RESEARCH PERFORMANCE; IMPACT; DISTRIBUTIONS; SCIENCE; NATIONS; SCORES; SCALES AB This paper investigates the citation impact of three large geographical areas - the U.S., the European Union (EU), and the rest of the world (RW) - at different aggregation levels. The difficulty is that 42% of the 3.6 million articles in our Thomson Scientific dataset are assigned to several sub-fields among a set of 219 Web of Science categories. We follow a multiplicative approach in which every article is wholly counted as many times as it appears at each aggregation level. We compute the crown indicator and the Mean Normalized Citation Score (MNCS) using for the first time sub-field normalization procedures for the multiplicative case. We also compute a third indicator that does not correct for differences in citation practices across sub-fields. It is found that: (1) No geographical area is systematically favored (or penalized) by any of the two normalized indicators. (2) According to the MNCS, only in six out of 80 disciplines - but in none of 20 fields - is the EU ahead of the U.S. In contrast, the normalized U.S./EU gap is greater than 20% in 44 disciplines, 13 fields, and for all sciences as a whole. The dominance of the EU over the RW is even greater. (3) The U. S. appears to devote relatively more - and the RW less - publication effort to sub-fields with a high mean citation rate, which explains why the U.S./EU and EU/RW gaps for all sciences as a whole increase by 4.5 and 5.6 percentage points in the un-normalized case. The results with a fractional approach are very similar indeed. (C) 2012 Elsevier Ltd. All rights reserved. C1 [Ruiz-Castillo, Javier] Univ Carlos III Madrid, Dept Econ, E-28903 Getafe, Spain. [Herranz, Neus] Univ Illinois, Dept Econ, Urbana, IL 61801 USA. RP Ruiz-Castillo, J (reprint author), Univ Carlos III Madrid, Dept Econ, E-28903 Getafe, Spain. 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Informetr. PD OCT PY 2012 VL 6 IS 4 BP 543 EP 556 DI 10.1016/j.joi.2012.02.006 PG 14 WC Information Science & Library Science SC Information Science & Library Science GA 003AY UT WOS:000308581700012 ER PT J AU Wei, JC Bu, B Liang, L AF Wei, Jiuchang Bu, Bing Liang, Liang TI Estimating the diffusion models of crisis information in micro blog SO JOURNAL OF INFORMETRICS LA English DT Article DE Diffusion model; Crisis information; Micro blog; Logistic model ID HIGHER-EDUCATION; SOCIAL NETWORKS; GROWTH-MODELS; COMMUNICATION; DISASTERS; DISSEMINATION; TWITTER; MEDIA AB The study tries to construct the diffusion models of crisis information in micro blog. We propose three information release patterns in micro blog according to the duration of crisis information released, namely concentrated release, continuous release, and pulse release. Based on Logistic function, three respective diffusion models are constructed. We choose three crisis events to test the diffusion models using the variables of the number of micro blogs with the crisis information (NMCI) and the increment of NMCI. The estimate results show that the diffusion of crisis information in micro blogs can be described by Logistic function, and the growth curve of NMCI is S-shaped. (C) 2012 Elsevier Ltd. All rights reserved. C1 [Wei, Jiuchang; Bu, Bing; Liang, Liang] Univ Sci & Technol China, Sch Management, Hefei 230026, Anhui, Peoples R China. [Liang, Liang] Univ Sci & Technol China, State Key Lab Fire Sci, Hefei 230026, Anhui, Peoples R China. RP Bu, B (reprint author), Univ Sci & Technol China, Sch Management, 96 JinZhai Rd, Hefei 230026, Anhui, Peoples R China. 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PD OCT PY 2012 VL 6 IS 4 BP 600 EP 610 DI 10.1016/j.joi.2012.06.005 PG 11 WC Information Science & Library Science SC Information Science & Library Science GA 003AY UT WOS:000308581700017 ER PT J AU Liao, CH Yen, HR AF Liao, Chien Hsiang Yen, Hsiuju Rebecca TI Quantifying the degree of research collaboration: A comparative study of collaborative measures SO JOURNAL OF INFORMETRICS LA English DT Article DE Research collaboration; Collaborative measures; Comparative study; Research productivity; Journal impact factor; Citation ID BIBLIOMETRIC INDICATORS; IMPACT; NETWORKS; PATTERNS; JOURNALS; CITATION; SCIENCE; CHEMISTRY AB This article reports a comparative study of five measures that quantify the degree of research collaboration, including the collaborative index, the degree of collaboration, the collaborative coefficient, the revised collaborative coefficient, and degree centrality. The empirical results showed that these measures all capture the notion of research collaboration, which is consistent with prior studies. Moreover, the results showed that degree centrality, the revised collaborative coefficient, and the degree of collaboration had the highest coefficient estimates on research productivity, the average JIF, and the average number of citations, respectively. Overall, this article suggests that the degree of collaboration and the revised collaborative coefficient are superior measures that can be applied to bibliometric studies for future researchers. (C) 2011 Elsevier Ltd. All rights reserved. C1 [Liao, Chien Hsiang] Natl Cent Univ, Dept Informat Management, Jhongli 32001, Taoyuan, Taiwan. [Yen, Hsiuju Rebecca] Natl Tsing Hua Univ, Inst Serv Sci, Hsinchu 30013, Taiwan. RP Liao, CH (reprint author), Natl Cent Univ, Dept Informat Management, 300 Jhongda Rd, Jhongli 32001, Taoyuan, Taiwan. 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Informetr. PD JAN PY 2012 VL 6 IS 1 BP 27 EP 33 DI 10.1016/j.joi.2011.09.003 PG 7 WC Information Science & Library Science SC Information Science & Library Science GA 865QL UT WOS:000298325300004 ER PT J AU Thelwall, M Sud, P AF Thelwall, Mike Sud, Pardeep TI Webometric research with the Bing Search API 2.0 SO JOURNAL OF INFORMETRICS LA English DT Article DE Webometrics; Bing; Bing API; Search engines ID ENGINES; WEB AB In May 2011 the Bing Search API 2.0 had become the only major international web search engine data source available for automatic offline processing for webometric research. This article describes its key features, contrasting them with previous web search data sources, and discussing implications for webometric research. 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Informetr. PD JAN PY 2012 VL 6 IS 1 BP 44 EP 52 DI 10.1016/j.joi.2011.10.002 PG 9 WC Information Science & Library Science SC Information Science & Library Science GA 865QL UT WOS:000298325300007 ER PT J AU Gagolewski, M AF Gagolewski, Marek TI Bibliometric impact assessment with R and the CITAN package SO JOURNAL OF INFORMETRICS LA English DT Article DE Data analysis software; Quality control in science; Citation analysis; Bibliometrics; Hirsch's h index; Egghe's g index; SciVerse Scopus ID H-INDEX; SCIENTIFIC IMPACT; OUTPUT; DATABASES; SCIENCE; SCOPUS; WEB AB In this paper CITAN, the CITation ANalysis package for R statistical computing environment, is introduced. The main aim of the software is to support bibliometricians with a tool for preprocessing and cleaning bibliographic data retrieved from SciVerse Scopus and for calculating the most popular indices of scientific impact. To show the practical usability of the package, an exemplary assessment of authors publishing in the fields of scientometrics and webometrics is performed. (C) 2011 Elsevier Ltd. All rights reserved. C1 [Gagolewski, Marek] Polish Acad Sci, Syst Res Inst, PL-01447 Warsaw, Poland. [Gagolewski, Marek] Warsaw Univ Technol, Fac Math & Informat Sci, PL-00661 Warsaw, Poland. RP Gagolewski, M (reprint author), Polish Acad Sci, Syst Res Inst, Ul Newelska 6, PL-01447 Warsaw, Poland. EM gagolews@ibspan.waw.pl RI Gagolewski, Marek/C-3575-2012 OI Gagolewski, Marek/0000-0003-0637-6028 CR Alonso S, 2010, SCIENTOMETRICS, V82, P391, DOI 10.1007/s11192-009-0047-5 Baneyx A, 2008, ARCH IMMUNOL THER EX, V56, P363, DOI 10.1007/s00005-008-0043-0 Beliakov G, 2011, J STAT SOFTWARE CODE, V39, P1 BENJAMINI Y, 1995, J ROY STAT SOC B MET, V57, P289 Blum M., 1973, Journal of Computer and System Sciences, V7, DOI 10.1016/S0022-0000(73)80033-9 Crawley M. 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Informetr. PD OCT PY 2011 VL 5 IS 4 BP 678 EP 692 DI 10.1016/j.joi.2011.06.006 PG 15 WC Information Science & Library Science SC Information Science & Library Science GA 841PI UT WOS:000296524200018 ER PT J AU Chen, DZ Huang, MH Hsieh, HC Lin, CP AF Chen, Dar-Zen Huang, Mu-Hsuan Hsieh, Hui-Chen Lin, Chang-Pin TI Identifying missing relevant patent citation links by using bibliographic coupling in LED illuminating technology SO JOURNAL OF INFORMETRICS LA English DT Article DE Patent citation network; Hidden relevant patent; Citation time lag; Bibliographical coupling; Pareto principle ID CRANFIELD TESTS; RESEARCH FRONTS; INFORMATION; COCITATION; DOCUMENTS; HISTORY; TAIWAN AB This study uses bibliographic coupling to identify missing relevant patent links, in order to construct a comprehensive citation network. Missing citation links can be added by taking the missing relevant patent links into account. The Pareto principle is used to determine the threshold of bibliographic coupling strength, in order to identify the missing relevant patent links. Comparisons between the original patent citation network and the comprehensive patent citation network with the missing relevant patent links are illustrated at both the patent and assignee levels. Light emitting diode (LED) illuminating technology is chosen as the case study. The relationships between the patents and the assignees are obviously enhanced after adding the missing relevant patent links. The results show that the growth rates on both the total number and the average number of links have apparently improved at the patent level. At the assignee level, the number of linked assignees and the average number of links between two assignees are increased. The differences between the two citation networks are further examined by means of the Freeman vertex betweenness centrality and Johnson's hierarchical clustering. The patents with more new links to other patents have distinct results in terms of the Freeman vertex betweenness centrality. The enhancement of links among patents also results in different clustering. Crown Copyright (C) 2011 Published by Elsevier Ltd. All rights reserved. C1 [Chen, Dar-Zen] Natl Taiwan Univ, Dept Mech Engn, Taipei 10764, Taiwan. [Chen, Dar-Zen; Hsieh, Hui-Chen] Natl Taiwan Univ, Inst Ind Engn, Taipei 10764, Taiwan. [Huang, Mu-Hsuan] Natl Taiwan Univ, Dept Lib & Informat Sci, Taipei 10764, Taiwan. [Lin, Chang-Pin] Natl Taiwan Ocean Univ, Dept Mech & Mechatron Engn, Keelung, Taiwan. RP Chen, DZ (reprint author), Natl Taiwan Univ, Dept Mech Engn, 1,Sec 4,Roosevelt Rd, Taipei 10764, Taiwan. 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A case study in the Library and Information Science field SO JOURNAL OF INFORMETRICS LA English DT Article DE Proceedings papers; Document type; Conference; Library and Information Science; Web of Science ID BIBLIOMETRIC ANALYSIS; PUBLICATION AB In 2008, the type of document "proceedings paper" (PP) was assigned in the WoS database to journal articles which were initially presented at a conference and later adapted for publication in a journal. Since the use of two different labels ("article" and "proceedings paper") might lead to infer differences in their relevance and/or quality, this paper presents a comparative study of standard journal articles and PP in journals to explore potential differences between them. The study focuses on the Library and Information Science field in the Web of Science database and covers the 1990-2008 period. PP approximately account for 9% of the total number of articles in this field, two-thirds of which are published in monographic issues devoted to conferences, which tend to be concentrated in specific journals. Proceedings papers emerge as an heterogeneous set comprising PP in ordinary issues, similar to standard articles in structure and impact of research; and PP in monographic issues, which seem to be less comprehensive and tend to receive less citations. Faster publication of PP in monographic than in ordinary issues may conceal differences in the review process undergone by either type of paper. The main implications of these results for authors, bibliometricians, journal editors and research evaluators are pointed out. (C) 2011 Elsevier Ltd. All rights reserved. C1 [Gonzalez-Albo, Borja; Bordons, Maria] Spanish Natl Res Council CSIC, Inst Estudios Documentales Ciencia & Tecnol IEDCY, Ctr Human & Social Sci CCHS, Madrid 28037, Spain. RP Gonzalez-Albo, B (reprint author), Spanish Natl Res Council CSIC, Inst Estudios Documentales Ciencia & Tecnol IEDCY, Ctr Human & Social Sci CCHS, Albasanz 26-28, Madrid 28037, Spain. 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Informetr. PD JUL PY 2011 VL 5 IS 3 BP 369 EP 381 DI 10.1016/j.joi.2011.01.011 PG 13 WC Information Science & Library Science SC Information Science & Library Science GA 769QF UT WOS:000291032500005 ER PT J AU Serenko, A Cox, RAK Bontis, N Booker, LD AF Serenko, Alexander Cox, Raymond A. K. Bontis, Nick Booker, Lorne D. TI The superstar phenomenon in the knowledge management and intellectual capital academic discipline SO JOURNAL OF INFORMETRICS LA English DT Article DE Superstar effect; Matthew effect; Yule-Simon model; Lotka's square law; Editor bias ID RESEARCH OUTPUT; CUMULATIVE ADVANTAGE; BIBLIOMETRIC DISTRIBUTIONS; SCIENTOMETRIC ANALYSIS; YULE DISTRIBUTION; ECONOMICS; SCIENCE; PRODUCTIVITY; PATTERNS; SCIENTISTS AB This paper reports on the first documented attempt to investigate the presence of the superstar (or Matthew) effect in the knowledge management and intellectual capital (KM/IC) scholarly discipline. The Yule-Simon model and Lotka's square law were applied to the publication data obtained from 2175 articles from 11 KM/IC journals. Based on the findings, it was concluded that the KM/IC discipline represents a very young, attractive academic field that welcomes contributions from a variety of academics and practitioners. In their paper acceptance decisions, KM/IC journal editors are not biased towards a small group of highly productive researchers, which is a positive sign that the field has been progressing in the right direction. The discipline is driven more by academics than by practitioners, and the distribution of articles is more concentrated among a few academic but not practitioner institutions. It was also observed that the Yule-Simon model and Lotka's square law may produce different distributions with respect to institutions. (C) 2011 Elsevier Ltd. All rights reserved. C1 [Serenko, Alexander] Lakehead Univ, Fac Business Adm, Thunder Bay, ON P7B 5E1, Canada. 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K., 1949, HUMAN BEHAV PRINCIPL Zuckerman H., 1977, SCI ELITE NR 52 TC 8 Z9 8 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 1751-1577 EI 1875-5879 J9 J INFORMETR JI J. Informetr. PD JUL PY 2011 VL 5 IS 3 BP 333 EP 345 DI 10.1016/j.joi.2011.01.005 PG 13 WC Information Science & Library Science SC Information Science & Library Science GA 769QF UT WOS:000291032500002 ER PT J AU Chen, LS Liu, CH Chiu, HJ AF Chen, Long-Sheng Liu, Cheng-Hsiang Chiu, Hui-Ju TI A neural network based approach for sentiment classification in the blogosphere SO JOURNAL OF INFORMETRICS LA English DT Article DE Semantic orientation; Neural networks; Sentiment classification; Blogs ID LATENT SEMANTIC ANALYSIS; BLOGS; KNOWLEDGE; PHONE AB Recognizing emotion is extremely important for a text-based communication tool such as a blog. On commercial blogs, the evaluation comments by bloggers of a product can spread at an explosive rate in cyberspace, and negative comments could be very harmful to an enterprise. Lately, researchers have been paying much attention to sentiment classification. The goal is to efficiently identify the emotions of their customers to allow companies to respond in the appropriate manner to what customers have to say. Semantic orientation indexes and machine learning methods are usually employed to achieve this goal. Semantic orientation indexes do not have good performance, but they return results quickly. Machine learning techniques provide better classification accuracy, but require a lot of training time. In order to combine the advantages of these two methods, this study proposed a neural-network based approach. It uses semantic orientation indexes as inputs for the neural networks to determine the sentiments of the bloggers quickly and effectively. Several actual blogs are used to evaluate the effectiveness of our approach. The experimental results indicate that the proposed approach outperforms traditional approaches including other neural networks and several semantic orientation indexes. (C) 2011 Elsevier Ltd. All rights reserved. C1 [Chen, Long-Sheng; Chiu, Hui-Ju] Chaoyang Univ Technol, Dept Informat Management, Wufong Township 41349, Taichung County, Taiwan. [Liu, Cheng-Hsiang] Natl Pingtung Univ Sci & Technol, Dept Ind Management, Neipu, Pingtung, Taiwan. RP Chen, LS (reprint author), Chaoyang Univ Technol, Dept Informat Management, 168 Jifong E Rd, Wufong Township 41349, Taichung County, Taiwan. 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Informetr. PD APR PY 2011 VL 5 IS 2 BP 313 EP 322 DI 10.1016/j.joi.2011.01.003 PG 10 WC Information Science & Library Science SC Information Science & Library Science GA 732AV UT WOS:000288154700007 ER PT J AU Kuan, CH Huang, MH Chen, DZ AF Kuan, Chung-Huei Huang, Mu-Hsuan Chen, Dar-Zen TI Ranking patent assignee performance by h-index and shape descriptors SO JOURNAL OF INFORMETRICS LA English DT Article DE h-Index; Rank-citation curve; Geometric interpretation; Shape descriptor; Patentometrics; Patent assignee ranking ID IMPACT; LEVEL AB We propose a geometric interpretation to the ranking of patent assignees by their h-indices as indicating the relative positions of their rank-citation curves. We then propose two shape descriptors characterizing the rank-citation curves over the h-cores and h-tails, respectively. Together with the h-indices, the shape descriptors help verifying the geometric relationship among rank-citation curves and the relative performance among the assignees' h-cores and h-tails. The geometric interpretation and shape descriptors are proven by empirical data to be reliable, accurate, robust, flexible, and insightful, and their application could be extended to research performance evaluation as well. Crown Copyright (C) 2011 Published by Elsevier Ltd. All rights reserved. C1 [Kuan, Chung-Huei; Chen, Dar-Zen] Natl Taiwan Univ, Dept Mech Engn, Taipei 10617, Taiwan. [Chen, Dar-Zen] Natl Taiwan Univ, Inst Ind Engn, Taipei 10617, Taiwan. [Huang, Mu-Hsuan] Natl Taiwan Univ, Dept Lib & Informat Sci, Taipei 10617, Taiwan. RP Chen, DZ (reprint author), Natl Taiwan Univ, Dept Mech Engn, 1,Sec 4,Roosevelt Rd, Taipei 10617, Taiwan. EM d98522047@ntu.edu.tw; mhhuang@ntu.edu.tw; dzchen@ntu.edu.tw RI Chen, Dar-Zen/D-1463-2012 OI Chen, Dar-Zen/0000-0002-7734-4835 CR Alonso S, 2009, J INFORMETR, V3, P273, DOI 10.1016/j.joi.2009.04.001 Alonso S, 2010, SCIENTOMETRICS, V82, P391, DOI 10.1007/s11192-009-0047-5 Bornmann L, 2008, J AM SOC INF SCI TEC, V59, P830, DOI 10.1002/asi.20806 Bornmann L, 2010, J INFORMETR, V4, P407, DOI 10.1016/j.joi.2010.03.005 Cabrerizo FJ, 2010, J INFORMETR, V4, P23, DOI 10.1016/j.joi.2009.06.005 Costas R, 2007, J INFORMETR, V1, P193, DOI 10.1016/j.joi.2007.02.001 Egghe L, 2010, ANNU REV INFORM SCI, V44, P65 Egghe L, 2006, SCIENTOMETRICS, V69, P131, DOI 10.1007/s11192-006-0144-7 Egghe L., 2006, ISSI NEWSLETTER, V2, P8 Egghe L, 2008, INFORM PROCESS MANAG, V44, P770, DOI 10.1016/j.ipm.2007.05.003 Garcia-Perez MA, 2009, SCIENTOMETRICS, V81, P779, DOI 10.1007/s11192-009-2290-1 Guan JC, 2009, J AM SOC INF SCI TEC, V60, P35, DOI 10.1002/asi.20954 Hall B, 2001, 8498 NAT BUR EC RES Hall Bronwyn H., 2000, 7741 NAT BUR EC RES Hirsch JE, 2005, P NATL ACAD SCI USA, V102, P16569, DOI 10.1073/pnas.0507655102 Jin B., 2007, ISSI NEWSLETTER, V3, P6 Jin BH, 2007, CHINESE SCI BULL, V52, P855, DOI 10.1007/s11434-007-0145-9 Kosmulski M., 2006, ISSI NEWSLETTER, V2, P4 Meyer M, 2004, SCIENTOMETRICS, V61, P443, DOI 10.1023/B:SCIE.0000045120.04489.80 Meyer M, 2000, SCIENTOMETRICS, V49, P93, DOI 10.1023/A:1005613325648 Rousseau R., 2008, COLLNET J SCIENTOMET, V2, P1 Rousseau R., 2006, SCI FOCUS, V1, P23 THOR A, DATABASE GROUP LEIPZ *US PAT TRAD OFF, 2010, PAT ORG 2009 van Eck NJ, 2008, J INFORMETR, V2, P263, DOI 10.1016/j.joi.2008.09.004 Wu Q, 2010, J AM SOC INF SCI TEC, V61, P609, DOI 10.1002/asi.21276 Ye FY, 2010, SCIENTOMETRICS, V84, P431, DOI 10.1007/s11192-009-0099-6 Zhang CT, 2009, PLOS ONE, V4, DOI 10.1371/journal.pone.0005429 NR 28 TC 8 Z9 8 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 1751-1577 J9 J INFORMETR JI J. Informetr. PD APR PY 2011 VL 5 IS 2 BP 303 EP 312 DI 10.1016/j.joi.2011.01.002 PG 10 WC Information Science & Library Science SC Information Science & Library Science GA 732AV UT WOS:000288154700006 ER PT J AU Vieira, ES Gomes, JANF AF Vieira, E. S. Gomes, J. A. N. F. TI A research impact indicator for institutions SO JOURNAL OF INFORMETRICS LA English DT Article DE Research impact indicator; Institutional impact; h index; Size-dependence of the h index ID RANKING SCIENTIFIC INSTITUTIONS; HIRSCH-TYPE INDEXES; H-INDEX; BIBLIOMETRIC INDICATORS; RESEARCH OUTPUT; JOURNALS AB This paper introduces a new impact indicator for the research effort of a university, (n)h(3). The number of documents or the number of citations obtained by an institution are used frequently in international ranking of institutions. However, these are very dependent on the size and this is inducing mergers with the apparent sole goal of improving the research ranking. The alternative is to use the ratio of the two measures, the mean citation rate, that is size independent but it has been shown to fluctuate along the time as a consequence of its dependence on a very small number of documents with an extremely good citation performance. In the last few years, the popularity of the Hirsch index as an indicator of the research performance of individual researchers led to its application to journals and institutions. However, the original aim of this h index of giving a mixed measure of the number of documents published and their impact as measured by the citations collected along the time is totally undesirable for institutions as the overall size may be considered irrelevant for the impact evaluation of research. Furthermore, the h index when applied to institutions tends to retain a very small number of documents making all other research production irrelevant for this indicator. The (n)h(3) index proposed here is designed to measure solely the impact of research in a way that is independent of the size of the institution and is made relatively stable by making a 20-year estimate of the citations of the documents produced in a single year. (C) 2010 Elsevier Ltd. All rights reserved. C1 [Vieira, E. S.; Gomes, J. A. N. F.] Univ Porto, Fac Ciencias, Dept Quim, REQUIMTE, P-4169007 Oporto, Portugal. RP Gomes, JANF (reprint author), Univ Porto, Fac Ciencias, Dept Quim, REQUIMTE, Rua Campo Alegre 687, P-4169007 Oporto, Portugal. EM jfgomes@fc.up.pt RI Gomes, Jose/G-7973-2011; Vieira, Elizabeth/A-6820-2010; REQUIMTE, AL/H-9106-2013; Chaves, Pedro/K-1288-2013 OI Gomes, Jose/0000-0002-5469-9449; Vieira, Elizabeth/0000-0002-2240-110X; CR Batista PD, 2006, SCIENTOMETRICS, V68, P179, DOI 10.1007/s11192-006-0090-4 Bornmann L, 2005, SCIENTOMETRICS, V65, P391, DOI 10.1007/s11192-005-0281-4 Bornmann L, 2008, RES EVALUAT, V17, P149, DOI 10.3152/095820208X319166 Bornmann L, 2007, J AM SOC INF SCI TEC, V58, P1381, DOI 10.1002/asi.20609 Braun T, 2005, SCIENTIST, V19, P8 Braun T, 2006, SCIENTOMETRICS, V69, P169, DOI 10.1007/s11192-006-0147-4 Costas R, 2007, J INFORMETR, V1, P193, DOI 10.1016/j.joi.2007.02.001 Cronin B, 2006, J AM SOC INF SCI TEC, V57, P1275, DOI 10.1002/asi.20354 CSAJBOK E, 2006, SCIENTOMETRICS, V69, P131 *CTR SCI TECHN STU, 2009, LEID RANK Egghe L, 2008, J AM SOC INF SCI TEC, V59, P1608, DOI 10.1002/asi.20845 GLANZEL W, 1915, 33 ANN C CAN ASS INF, P315 *HIGH ED EV ACCR C, 2009, 2009 PERF RANK SCI P Hirsch JE, 2007, P NATL ACAD SCI USA, V104, P19193, DOI 10.1073/pnas.0707962104 Hirsch JE, 2005, P NATL ACAD SCI USA, V102, P16569, DOI 10.1073/pnas.0507655102 JIN B, 2006, SCI FOCUS, P8 Jin BH, 2007, CHINESE SCI BULL, V52, P855, DOI 10.1007/s11434-007-0145-9 Liang LM, 2006, SCIENTOMETRICS, V69, P153, DOI 10.1007/s11192-006-0145-6 Molinari A, 2008, SCIENTOMETRICS, V75, P339, DOI 10.1007/s11192-007-1872-z Molinari JF, 2008, SCIENTOMETRICS, V75, P163, DOI 10.1007/s11192-007-1853-2 Prathap G, 2006, CURR SCI INDIA, V91, P1439 Rousseau R, 2008, J AM SOC INF SCI TEC, V59, P1853, DOI 10.1002/asi.20890 Schubert A, 2007, J INFORMETR, V1, P179, DOI 10.1016/j.joi.2006.12.002 SCIMAGO, 2009, GENERALIZED HIRSCH H Van Raan AFJ, 2006, SCIENTOMETRICS, V67, P491, DOI 10.1556/Scient.67.2006.3.10 Vieira E. S., 2009, 12 INT C SCI INF 14 NR 26 TC 8 Z9 8 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 1751-1577 J9 J INFORMETR JI J. Informetr. PD OCT PY 2010 VL 4 IS 4 BP 581 EP 590 DI 10.1016/j.joi.2010.06.006 PG 10 WC Information Science & Library Science SC Information Science & Library Science GA 647KA UT WOS:000281616200012 ER PT J AU Persson, O AF Persson, Olle TI Identifying research themes with weighted direct citation links SO JOURNAL OF INFORMETRICS LA English DT Article DE Weighted direct citation links; Shared inlinks and outlinks; Mapping; Library and information science ID AUTHOR COCITATION ANALYSIS; INFORMATION-RETRIEVAL; SCIENTIFIC LITERATURE; RESEARCH FRONTS; ALL-AUTHOR; SCIENCE; OBSOLESCENCE; NETWORKS; PATTERNS; DESIGN AB In this study direct citations are weighted with shared references and co-citations in an attempt to decompose a citation network of articles on the subject of library and information science. The resulting maps have much in common with author co-citation maps that have been previously presented. However, using direct citations yields somewhat more detail in terms of detecting sub-domains. Reducing the network down to the strongest links of each article yielded the best results in terms of a high number of clusters, each with a substantial number of articles similar in content. (C) 2010 Elsevier Ltd. All rights reserved. C1 Umea Univ, Dept Sociol, SE-90187 Umea, Sweden. RP Persson, O (reprint author), Umea Univ, Dept Sociol, SE-90187 Umea, Sweden. 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Informetr. PD JUL PY 2010 VL 4 IS 3 BP 415 EP 422 DI 10.1016/j.joi.2010.03.006 PG 8 WC Information Science & Library Science SC Information Science & Library Science GA 607YQ UT WOS:000278543600020 ER PT J AU Bornmann, L Daniel, HD AF Bornmann, Lutz Daniel, Hans-Dieter TI Citation speed as a measure to predict the attention an article receives: An investigation of the validity of editorial decisions at Angewandte Chemie International Edition SO JOURNAL OF INFORMETRICS LA English DT Article DE Journal peer review; Validity; Citation speed ID SCIENCE; JOURNALS; COUNTS; IMPACT; PAY AB The scientific quality of a publication can be determined not only based on the number of times it is cited but also based on the speed with which its content is disseminated in the scientific community. In this study we tested whether manuscripts that were accepted by Angewandte Chemie International Edition (one of the prime chemistry journals worldwide) received the first citation after publication faster than manuscripts that were rejected by the journal but published elsewhere. The results of a Cox regression model show that accepted manuscripts have a 49% higher hazard rate of citation than rejected manuscripts. (C) 2009 Elsevier Ltd. All rights reserved. C1 [Bornmann, Lutz; Daniel, Hans-Dieter] ETH, CH-8092 Zurich, Switzerland. [Daniel, Hans-Dieter] Univ Zurich, Evaluat Off, CH-8001 Zurich, Switzerland. RP Bornmann, L (reprint author), ETH, Zahringerstr 24, CH-8092 Zurich, Switzerland. EM bornmann@gess.ethz.ch; daniel@evaluation.uzh.ch RI Daniel, Hans-Dieter/A-2419-2013; Bornmann, Lutz/A-3926-2008 OI Bornmann, Lutz/0000-0003-0810-7091 CR Bornmann L, 2008, ANGEW CHEM INT EDIT, V47, P7173, DOI 10.1002/anie.200800513 Bornmann L, 2009, LEARN PUBL, V22, P117, DOI 10.1087/2009207 Bornmann L, 2008, J AM SOC INF SCI TEC, V59, P1841, DOI 10.1002/asi.20901 Bornmann L, 2007, J AM SOC INF SCI TEC, V58, P1100, DOI 10.1002/asi.20531 Bornmann L, 2009, J INFORMETR, V3, P348, DOI 10.1016/j.joi.2009.05.002 Bornmann L, 2008, J DOC, V64, P45, DOI 10.1108/00220410810844150 BORNMANN L, MANUSCRIPT IN PRESS Cleves MA, 2004, INTRO SURVIVAL ANAL Cox DR, 1972, J R STAT SOC B, V187, P220 COZZENS SE, 1985, SOC STUD SCI, V15, P127, DOI 10.1177/030631285015001005 Egghe L, 2001, MATH COMPUT MODEL, V34, P81, DOI 10.1016/S0895-7177(01)00050-4 Egghe L, 2000, SCIENTOMETRICS, V48, P345, DOI 10.1023/A:1005688404778 Garfield E, 2002, SCIENTIST, V16, P10 Glanzel W, 2006, SCIENTOMETRICS, V67, P263, DOI 10.1556/Scient.67.2006.2.8 Golitz P, 2005, ANGEW CHEM INT EDIT, V44, P4, DOI 10.1002/anie.200462726 Hames I., 2007, PEER REV MANUSCRIPT HERBERTZ H, 1995, SCIENTOMETRICS, V33, P117, DOI 10.1007/BF02020777 Hosmer DW, 2000, APPL LOGISTIC REGRES, V2nd Kraemer HC, 2003, J AM ACAD CHILD PSY, V42, P1524, DOI 10.1097/01.chi.0000091507.46853.d1 Leimu R, 2005, TRENDS ECOL EVOL, V20, P28, DOI 10.1016/j.tree.2004.10.010 MERTON RK, 1968, SCIENCE, V159, P56, DOI 10.1126/science.159.3810.56 MOED HF, 1986, CZECH J PHYS, V36, P97, DOI 10.1007/BF01599737 ROUSSEAU R, 1994, SCIENTOMETRICS, V30, P213, DOI 10.1007/BF02017224 Safer MA, 2009, PERSPECT PSYCHOL SCI, V4, P51, DOI 10.1111/j.1745-6924.2009.01104.x SCHUBERT A, 1986, CZECH J PHYS, V36, P121, DOI 10.1007/BF01599743 SEGLEN PO, 1992, J AM SOC INFORM SCI, V43, P628, DOI 10.1002/(SICI)1097-4571(199210)43:9<628::AID-ASI5>3.0.CO;2-0 StataCorp, 2007, STAT STAT SOFTW REL *STATACORP, 2007, SURV AN EP TABL REF van Dalen HP, 2005, SCIENTOMETRICS, V64, P209, DOI 10.1007/s11192-005-0248-5 Van Dalen HP, 2004, POPUL DEV REV, V30, P489 NR 30 TC 8 Z9 8 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 1751-1577 J9 J INFORMETR JI J. Informetr. PD JAN PY 2010 VL 4 IS 1 BP 83 EP 88 DI 10.1016/j.joi.2009.09.001 PG 6 WC Information Science & Library Science SC Information Science & Library Science GA 530ZI UT WOS:000272631100009 ER PT J AU Vasileiadou, E AF Vasileiadou, Eleftheria TI Stabilisation operationalised: Using time series analysis to understand the dynamics of research collaboration SO JOURNAL OF INFORMETRICS LA English DT Article DE Scientific collaboration; Time series analysis; ARIMA models; E-science; Online data ID SCIENTIFIC COLLABORATION; COMMUNICATION; IMPACT AB The aim of the paper is to investigate the use of online data and time series analysis, in order to study the dynamics of new types of research collaboration in a systematic way. Two international research teams were studied for more than 3 years, and quantitative data about their internet use together with observation of their collaboration patterns were gathered. Time series analysis (ARIMA modelling) was performed on their use of internet, and specific types of models related to specific ways of conducting research at a distance. The paper proposes the use of online data and ARIMA models to identify the stabilisation of a complex system, such as a research team, and investigate everyday research practices. (C) 2008 Elsevier Ltd. All rights reserved. C1 Vrije Univ Amsterdam, Inst Environm Studies, NL-1081 HV Amsterdam, Netherlands. RP Vasileiadou, E (reprint author), Vrije Univ Amsterdam, Inst Environm Studies, Boelelaan 1085, NL-1081 HV Amsterdam, Netherlands. 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M, 1998, SPECTRAL ANAL TIME S Yin R. K., 2003, APPL SOCIAL RES METH, V5 NR 36 TC 8 Z9 8 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 1751-1577 J9 J INFORMETR JI J. Informetr. PD JAN PY 2009 VL 3 IS 1 BP 36 EP 48 DI 10.1016/j.joi.2008.11.002 PG 13 WC Information Science & Library Science SC Information Science & Library Science GA 395BI UT WOS:000262496700004 ER PT J AU Mogoutov, A Cambrosio, A Keating, P Mustar, P AF Mogoutov, Andrei Cambrosio, Alberto Keating, Peter Mustar, Philippe TI Biomedical innovation at the laboratory, clinical and commercial interface: A new method for mapping research projects, publications and patents in the field of microarrays SO JOURNAL OF INFORMETRICS LA English DT Article DE Microarrays; Biomedical innovation; Triple-helix; University-industry-government relations; Publications; Patents; Research projects; Text-mining; Network analysis; Visualization ID TECHNOLOGY; SCIENCE AB Using the example of microarrays, one of the constitutive technologies of post-genomic biomedicine, this paper introduces a method for analyzing publications, patents and research grants as proxies for "triple-helix interfaces" between university, industry and government activities. Our method creates bridges that allow one to move seamlessly between publication, patent and research project databases that use different fields and formats, and contain different information. These links do not require pre-defined categories in order to search for correspondences between sub-topics or research areas in the three databases. Finally, our results are not restricted to quantitative information but, rather, allow one to carry out qualitative investigations of the content of research activities. Our approach draws on a combination of text-mining and network analysis/mapping software packages. (C) 2008 Elsevier Ltd. All rights reserved. C1 [Cambrosio, Alberto] McGill Univ, Dept Social Studies Med, Montreal, PQ, Canada. [Mogoutov, Andrei] Aguidel, Paris, France. [Keating, Peter] Univ Quebec, Dept Hist, Montreal, PQ H3C 3P8, Canada. [Mustar, Philippe] Ecole Natl Super Mines, Ctr Sociol Innovat, Paris, France. RP Cambrosio, A (reprint author), McGill Univ, Dept Social Studies Med, Montreal, PQ, Canada. EM andrei@aguidel.com; alberto.cambrosio@mcgill.ca; keating.peter@uqam.ca; philippe.mustar@ensmp.fr RI Mogoutov, Andrei/G-2889-2010 CR ANANIADOU S, 2006, TECHNOLOGY, V31, P431 BURLATSKY SF, 1992, PHYS LETT A, V166, P230, DOI 10.1016/0375-9601(92)90368-V BURLATSKY SF, 1990, PHYS REV LETT, V65, P3205, DOI 10.1103/PhysRevLett.65.3205 CAMBROSIO A, 2007, SCIENCE, P165 CAMBROSIO A, Routledge Cambrosio A, 2006, EUR J CANCER, V42, P3140, DOI 10.1016/j.ejca.2006.07.020 CARTER GM, 1974, EDUCATION, P1583 CHANG J, 2006, Artech House, P99 Constans A, 2003, SCIENTIST, V17, P34 CORONINI R, 2007, NAT BIOTECHNOL, V27, P21 FLATTMANN GJ, 2007, NAT BIOTECHNOL, V2007, P777 Fransman M, 2001, RES POLICY, V30, P263, DOI 10.1016/S0048-7333(99)00103-1 GEORGHIOU L, 2006, J MED, V2003, P2495 KEATING P, 1980, SOCIETY, V23, P15 MAUGUIN P, 1997, ECONOMICA, P117 MCMEEKIN A, 2004, Edward Elgar Publish, P35 MOED HF, 2004, Kluwer Mougotov A., 2007, RES POLICY, V36, P893 MOWERY DC, 2001, Edward Elgar, P15 Mustar P., 2001, STI REV, V26, P165 Mustar P., 1997, SCI PUBL POLICY, V24, P37 NARIN F, 1983, PLANNING OSHANIN GS, 1990, PHYS LETT A, V149, P55, DOI 10.1016/0375-9601(90)90870-T OUDSHOORN N, 2003, MIT Press PERKEL JM, 2005, MEDICINE, V19, P34 PETRONE J, 2007, BioArrayNews, V7, P31 Powell WW, 1996, ADMIN SCI QUART, V41, P116, DOI 10.2307/2393988 Quackenbush J, 2006, NEW ENGL J MED, V354, P2463, DOI 10.1056/NEJMra042342 Rogers Susan, 2007, Yale Journal of Biology and Medicine, V80, P165 SIMON, 2003, SCIENTOMETRICS, V58, P241 Verbeek A, 2002, SCIENTOMETRICS, V54, P399, DOI 10.1023/A:1016034516731 VON H, 1976, RES POLICY, V5, P212 VON H, 1989, RES MANAGE, V32, P24 VON HE, 1986, MANAGE SCI, V32, P791 ZIPF GK, 1949, HUMAN BEHAV NR 35 TC 8 Z9 8 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 1751-1577 J9 J INFORMETR JI J. Informetr. PD OCT PY 2008 VL 2 IS 4 BP 341 EP 353 DI 10.1016/j.joi.2008.06.005 PG 13 WC Information Science & Library Science SC Information Science & Library Science GA 372LS UT WOS:000260903700010 ER PT J AU Abramo, G D'Angelo, CA Rosati, F AF Abramo, Giovanni D'Angelo, Ciriaco Andrea Rosati, Francesco TI The importance of accounting for the number of co-authors and their order when assessing research performance at the individual level in the life sciences SO JOURNAL OF INFORMETRICS LA English DT Article DE Research evaluation; Co-authorship; Fractional counting; Bibliometrics; Biology; Medicine ID RESEARCH PRODUCTIVITY; G-INDEX; PUBLICATIONS; COAUTHORS; PATTERNS; CREDIT; IMPACT AB Accurate measurement of research productivity should take account of both the number of co-authors of every scientific work and of the different contributions of the individuals. For researchers in the life sciences, common practice is to indicate such contributions through position in the authors list. In this work, we measure the distortion introduced to bibliometric ranking lists for scientific productivity when the number of co-authors or their position in the list is ignored. The field of observation consists of all Italian university professors working in the life sciences, with scientific production examined over the period 2004-2008. The outcomes of the study lead to a recommendation against using indicators or evaluation methods that ignore the different authors' contributions to the research results. (C) 2012 Elsevier Ltd. All rights reserved. C1 [Abramo, Giovanni] Natl Res Council Italy, Inst Syst Anal & Comp Sci IASI CNR, Rome, Italy. [Abramo, Giovanni; D'Angelo, Ciriaco Andrea; Rosati, Francesco] Univ Roma Tor Vergata, Dept Management, Sch Engn, Lab Studies Res & Technol Transfer, Rome, Italy. RP Abramo, G (reprint author), Univ Roma Tor Vergata, Dipartimento Ingn Impresa, Via Politecn 1, I-00133 Rome, Italy. EM giovanni.abramo@uniroma2.it RI Rosati, Francesco/C-4783-2013 OI Rosati, Francesco/0000-0001-5085-5056 CR Abramo G, 2011, SCIENTOMETRICS, V88, P915, DOI 10.1007/s11192-011-0426-6 Abramo G, 2008, RES EVALUAT, V17, P111, DOI 10.3152/095820208X280916 Batista PD, 2006, SCIENTOMETRICS, V68, P179, DOI 10.1007/s11192-006-0090-4 Bhandari M, 2003, J BONE JOINT SURG AM, V85A, P1605 Carbone V., 2011, 11060114 ARXIV D'Angelo CA, 2011, J AM SOC INF SCI TEC, V62, P257, DOI 10.1002/asi.21460 Egghe L, 2006, SCIENTOMETRICS, V69, P131, DOI 10.1007/s11192-006-0144-7 Egghe L, 2008, J AM SOC INF SCI TEC, V59, P1608, DOI 10.1002/asi.20845 He B, 2012, J INFORMETR, V6, P359, DOI 10.1016/j.joi.2012.01.001 Hirsch JE, 2005, P NATL ACAD SCI USA, V102, P16569, DOI 10.1073/pnas.0507655102 Laurance WF, 2006, NATURE, V442, P26, DOI 10.1038/442026d Lukovits I, 1995, SOC INDIC RES, V36, P91, DOI 10.1007/BF01079398 Lundberg J, 2007, J INFORMETR, V1, P145, DOI 10.1016/j.joi.2006.09.007 Opthof T, 2010, J INFORMETR, V4, P423, DOI 10.1016/j.joi.2010.02.003 Schreiber M, 2010, J INFORMETR, V4, P42, DOI 10.1016/j.joi.2009.06.003 Schreiber M, 2009, J AM SOC INF SCI TEC, V60, P1274, DOI 10.1002/asi.21057 Trueba FJ, 2004, SCIENTOMETRICS, V60, P181, DOI 10.1023/B:SCIE.0000027792.09362.3f VanHooydonk G, 1997, J AM SOC INFORM SCI, V48, P944, DOI 10.1002/(SICI)1097-4571(199710)48:10<944::AID-ASI8>3.0.CO;2-1 Verhagen JV, 2003, NATURE, V426, P602, DOI 10.1038/426602a Vinkler P, 2000, CURR SCI INDIA, V79, P602 Vinkler P, 2012, J INFORMETR, V6, P254, DOI 10.1016/j.joi.2011.12.004 Wan J. K., 2008, COLLNET, V17 ZUCKERMAN HA, 1968, AM J SOCIOL, V74, P276, DOI 10.1086/224641 NR 23 TC 7 Z9 7 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 1751-1577 J9 J INFORMETR JI J. Informetr. PD JAN PY 2013 VL 7 IS 1 BP 198 EP 208 DI 10.1016/j.joi.2012.11.003 PG 11 WC Information Science & Library Science SC Information Science & Library Science GA 065BG UT WOS:000313121300024 ER PT J AU Bornmann, L AF Bornmann, Lutz TI A better alternative to the h index SO JOURNAL OF INFORMETRICS LA English DT Letter C1 Max Planck Gesell, Div Sci & Innovat Studies, Adm Headquarters, D-80539 Munich, Germany. RP Bornmann, L (reprint author), Max Planck Gesell, Div Sci & Innovat Studies, Adm Headquarters, Hofgartenstr 8, D-80539 Munich, Germany. EM bornmann@gv.mpg.de RI Bornmann, Lutz/A-3926-2008 OI Bornmann, Lutz/0000-0003-0810-7091 CR Acuna DE, 2012, NATURE, V489, P201, DOI 10.1038/489201a Bornmann Lutz, 2012, J INFORMETR, V6, P333 Tijssen RJW, 2002, SCIENTOMETRICS, V54, P381, DOI 10.1023/A:1016082432660 Waltman L, 2012, J AM SOC INF SCI TEC, V63, P406, DOI 10.1002/asi.21678 Waltman L., JOURNAL OF THE AMERI NR 5 TC 7 Z9 7 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 1751-1577 J9 J INFORMETR JI J. Informetr. PD JAN PY 2013 VL 7 IS 1 BP 100 EP 100 DI 10.1016/j.joi.2012.09.004 PG 1 WC Information Science & Library Science SC Information Science & Library Science GA 065BG UT WOS:000313121300012 ER PT J AU Dorta-Gonzalez, P Dorta-Gonzalez, MI AF Dorta-Gonzalez, P. Dorta-Gonzalez, M. I. TI Impact maturity times and citation time windows: The 2-year maximum journal impact factor SO JOURNAL OF INFORMETRICS LA English DT Article DE Journal metrics; Bibliometric indicator; Citation analysis; Journal impact factor; Citation time window; Impact maturity time ID H-INDEX; INDICATORS; SCIENCE; FIELDS; TERMS; TOOL AB Journal metrics are employed for the assessment of scientific scholar journals from a general bibliometric perspective. In this context, the Thomson Reuters journal impact factors (JIFs) are the citation-based indicators most used. The 2-year journal impact factor (2-JIF) counts citations to one and two year old articles, while the 5-year journal impact factor (5-JIF) counts citations from one to five year old articles. Nevertheless, these indicators are not comparable among fields of science for two reasons: (i) each field has a different impact maturity time, and (ii) because of systematic differences in publication and citation behavior across disciplines. In fact, the 5-JIF firstly appeared in the journal Citation Reports OCR) in 2007 with the purpose of making more comparable impacts in fields in which impact matures slowly. However, there is not an optimal fixed impact maturity time valid for all the fields. In some of them two years provides a good performance whereas in others three or more years are necessary. Therefore, there is a problem when comparing a journal from a field in which impact matures slowly with a journal from a field in which impact matures rapidly. In this work, we propose the 2-year maximum journal impact factor (2M-JIF), a new impact indicator that considers the 2-year rolling citation time window of maximum impact instead of the previous 2-year time window. Finally, an empirical application comparing 2-JIF, 5-JIF, and 2M-JIF shows that the maximum rolling target window reduces the between-group variance with respect to the within-group variance in a random sample of about six hundred journals from eight different fields. (C) 2013 Elsevier Ltd. All rights reserved. C1 [Dorta-Gonzalez, P.] Univ Palmas Gran Canaria, Dept Metodos Cuantitat Econ & Gest, Gran Canaria, Spain. [Dorta-Gonzalez, M. I.] Univ La Laguna, Dept Estadist Invest Operat & Comput, Tenerife, Spain. RP Dorta-Gonzalez, P (reprint author), Univ Palmas Gran Canaria, Dept Metodos Cuantitat Econ & Gest, Gran Canaria, Spain. 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Informetr. PY 2013 VL 7 IS 3 BP 593 EP 602 DI 10.1016/j.joi.2013.03.005 PG 10 WC Information Science & Library Science SC Information Science & Library Science GA 210UH UT WOS:000323859700003 ER PT J AU Gagolewski, M Mesiar, R AF Gagolewski, Marek Mesiar, Radko TI Aggregating different paper quality measures with a generalized h-index SO JOURNAL OF INFORMETRICS LA English DT Article DE Aggregation operators; Impact functions; Hirsch's h-index; Quality control; Scientometrics; Bibliometrics; SJR; SNIP; Scopus; CITAN; R ID SCIENTIFIC IMPACT INDEXES; CITATION; SCIENCE; OPERATORS AB The process of assessing individual authors should rely upon a proper aggregation of reliable and valid papers' quality metrics. Citations are merely one possible way to measure appreciation of publications. In this study we propose some new, SJR- and SNIP-based indicators, which not only take into account the broadly conceived popularity of a paper (manifested by the number of citations), but also other factors like its potential, or the quality of papers that cite a given publication. We explore the relation and correlation between different metrics and study how they affect the values of a real-valued generalized h-index calculated for 11 prominent scientometricians. We note that the h-index is a very unstable impact function, highly sensitive for applying input elements' scaling. Our analysis is not only of theoretical significance: data scaling is often performed to normalize citations across disciplines. Uncontrolled application of this operation may lead to unfair and biased (toward some groups) decisions. This puts the validity of authors assessment and ranking using the h-index into question. Obviously, a good impact function to be used in practice should not be as much sensitive to changing input data as the analyzed one. (C) 2012 Elsevier Ltd. All rights reserved. C1 [Gagolewski, Marek] Polish Acad Sci, Syst Res Inst, PL-01447 Warsaw, Poland. [Gagolewski, Marek] Warsaw Univ Technol, Fac Math & Informat Sci, PL-00661 Warsaw, Poland. [Mesiar, Radko] Slovak Univ Technol Bratislava, Fac Civil Engn, Dept Math, Bratislava 81368, Slovakia. [Mesiar, Radko] Univ Ostrava, Inst Res & Applicat Fuzzy Modelling, CZ-70103 Ostrava, Czech Republic. RP Gagolewski, M (reprint author), Polish Acad Sci, Syst Res Inst, Ul Newelska 6, PL-01447 Warsaw, Poland. 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Informetr. PD OCT PY 2012 VL 6 IS 4 BP 566 EP 579 DI 10.1016/j.joi.2012.05.001 PG 14 WC Information Science & Library Science SC Information Science & Library Science GA 003AY UT WOS:000308581700014 ER PT J AU Huang, MH Chang, HW Chen, DZ AF Huang, Mu-Hsuan Chang, Han-Wen Chen, Dar-Zen TI The trend of concentration in scientific research and technological innovation: A reduction of the predominant role of the U.S. in world research & technology SO JOURNAL OF INFORMETRICS LA English DT Article DE Productivity; Impact; Science concentration; Technology concentration ID NATIONAL PERFORMANCES; PUBLICATION OUTPUT; CITATION IMPACT; SCIENCE; NANOTECHNOLOGY; DECLINE; COUNTRIES; EVOLUTION; PATENTS; KOREA AB This study investigates the trend of global concentration in scientific research and technological innovation around the world. It accepts papers and patents as appropriate data for revealing the development and status of science and technology respectively. The performance of these outputs in production and citation impact is taken into consideration in the analysis. The findings suggest that both papers and patents are geographically concentrated on a small number of countries, including the United States, the United Kingdom, Japan, Germany, and France. China has made great progress in paper production and citation impact, and Taiwan and Korea have experienced a rapid growth in patents over the past years. The degree of concentration dramatically decreases when the data from the United States are excluded, indicating the effects of the U.S.'s participation on the concentration. Patents show a higher degree of concentration than papers. With time-varying aspects taken into consideration, the study indicates that the degree of concentration of papers and patents has gradually decreased over time. The concentration of patents has declined more slowly than that of papers. This decrease of the concentration is mainly due to the reduction of the predominant role of the U.S. in world R&D output. (C) 2012 Elsevier Ltd. All rights reserved. C1 [Chen, Dar-Zen] Natl Taiwan Univ, Dept Mech Engn, Taipei 10617, Taiwan. [Huang, Mu-Hsuan; Chang, Han-Wen] Natl Taiwan Univ, Dept Lib & Informat Sci, Taipei 10617, Taiwan. RP Chen, DZ (reprint author), Natl Taiwan Univ, Dept Mech Engn, 1,Sec 4,Roosevelt Rd, Taipei 10617, Taiwan. 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PD OCT PY 2012 VL 6 IS 4 BP 457 EP 468 DI 10.1016/j.joi.2012.03.003 PG 12 WC Information Science & Library Science SC Information Science & Library Science GA 003AY UT WOS:000308581700001 ER PT J AU Abramo, G Cicero, T D'Angelo, CA AF Abramo, Giovanni Cicero, Tindaro D'Angelo, Ciriaco Andrea TI The dispersion of research performance within and between universities as a potential indicator of the competitive intensity in higher education systems SO JOURNAL OF INFORMETRICS LA English DT Article DE Research evaluation; Variability of performance; Concentration of performance; University; Bibliometrics; Italy ID SCIENCE; NATIONS AB Higher education systems in competitive environments generally present top universities, that are able to attract top scientists, top students and public and private financing, with notable socio-economic benefits in their region. The same does not hold true for noncompetitive systems. In this study we will measure the dispersion of research performance within and between universities in the Italian university system, typically non-competitive. We will also investigate the level of correlation that occurs between performance in research and its dispersion in universities. The findings may represent a first benchmark for similar studies in other nations. Furthermore, they lead to policy indications, questioning the effectiveness of selective funding of universities based on national research assessment exercises. The field of observation is composed of all Italian universities active in the hard sciences. Research performance will be evaluated using a bibliometric approach, through publications indexed in the Web of Science between 2004 and 2008. (C) 2011 Elsevier Ltd. All rights reserved. C1 [Abramo, Giovanni; Cicero, Tindaro; D'Angelo, Ciriaco Andrea] Univ Roma Tor Vergata, Dept Management, Sch Engn, Lab Studies Res & Technol Transfer, Rome, Italy. [Abramo, Giovanni] CNR, IASI, Inst Syst Anal & Comp Sci, I-00185 Rome, Italy. RP Abramo, G (reprint author), Univ Roma Tor Vergata, Dipartimento Ingn Impresa, Via Politecn 1, I-00133 Rome, Italy. 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Informetr. PD APR PY 2012 VL 6 IS 2 BP 155 EP 168 DI 10.1016/j.joi.2011.11.007 PG 14 WC Information Science & Library Science SC Information Science & Library Science GA 906RF UT WOS:000301364100001 ER PT J AU Ortega, JL Lopez-Romero, E Fernandez, I AF Luis Ortega, Jose Lopez-Romero, Elena Fernandez, Ines TI Multivariate approach to classify research institutes according to their outputs: The case of the CSIC's institutes SO JOURNAL OF INFORMETRICS LA English DT Article DE Scientometrics; Principal component analysis; Linear discriminant analysis; Research centres classification ID PRINCIPAL COMPONENT ANALYSIS; CLASSIFICATION; UNIVERSITIES; PERFORMANCE; INDICATORS AB This paper attempts to build a classification model according to the research products created by those institutes and hence to design specific evaluation processes. Several scientific input/output indicators belonging to 109 research institutes from the Spanish National Research Council (CSIC) were selected. A multidimensional approach was proposed to resume these indicators in various components. A clustering analysis was used to classify the institutes according to their scores with those components (principal component analysis). Moreover, the validity of the a priori classification was tested and the most discriminant variables were detected (linear discriminant analysis). Results show that there are three types of institutes according to their research outputs: Humanistic, Scientific and Technological. It is argue that these differences oblige to design more precise assessment exercises which focus on the particular results of each type of institute. We conclude that this method permits to build more precise research assessment exercises which consider the varied nature of the scientific activity. (C) 2011 Elsevier Ltd. All rights reserved. C1 [Luis Ortega, Jose; Lopez-Romero, Elena; Fernandez, Ines] CSIC, R&DUnit, E-28006 Madrid, Spain. RP Ortega, JL (reprint author), CSIC, R&DUnit, Serrano 113, E-28006 Madrid, Spain. 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Informetr. PD JUL PY 2011 VL 5 IS 3 BP 323 EP 332 DI 10.1016/j.joi.2011.01.004 PG 10 WC Information Science & Library Science SC Information Science & Library Science GA 769QF UT WOS:000291032500001 ER PT J AU Bras-Amoros, M Domingo-Ferrer, J Torra, V AF Bras-Amoros, Maria Domingo-Ferrer, Josep Torra, Vicenc TI A bibliometric index based on the collaboration distance between cited and citing authors SO JOURNAL OF INFORMETRICS LA English DT Article DE Bibliometric indices; h-Index; c-Index ID H-INDEX; IMPACT; SCIENTISTS; CITATIONS; RANKING; NUMBERS AB The popular h-index used to measure scientific output can be described in terms of a pool of evaluated objects (the papers), a quality function on the evaluated objects (the number of citations received by each paper) and a sentencing line crossing the origin, whose intersection with the graph of the quality function yields the index value (in the h-index this is a line with slope 1). Based on this abstraction, we present a new index, the c-index, in which the evaluated objects are the citations received by an author, a group of authors, a journal, etc., the quality function of a citation is the collaboration distance between the authors of the cited and the citing papers, and the sentencing line can take slopes between 0 and infinity. As a result, the new index counts only those citations which are significant enough, where significance is proportional to collaboration distance. Several advantages of the new c-index with respect to previous proposals are discussed. (C) 2010 Elsevier Ltd. All rights reserved. C1 [Bras-Amoros, Maria; Domingo-Ferrer, Josep] Univ Rovira & Virgili, Dept Comp Engn & Math, UNESCO Chair Data Privacy, E-43007 Tarragona, Catalonia, Spain. [Torra, Vicenc] IIIA CSIC, E-08193 Barcelona, Catalonia, Spain. RP Bras-Amoros, M (reprint author), Univ Rovira & Virgili, Dept Comp Engn & Math, UNESCO Chair Data Privacy, Av Pasos Catalans 26, E-43007 Tarragona, Catalonia, Spain. EM maria.bras@urv.cat; josep.domingo@urv.cat; vtorra@iiia.csic.es CR *AM MATH SOC, MATHSCINET MATH REV [Anonymous], DBLP COMPUTER SCI BI Ball P, 2005, NATURE, V436, P900, DOI 10.1038/436900a Bornmann L, 2007, J AM SOC INF SCI TEC, V58, P1381, DOI 10.1002/asi.20609 Braun T, 2006, SCIENTOMETRICS, V69, P169, DOI 10.1007/s11192-006-0147-4 *CITESEER IST, SCI LIT DIG LIB *CORE, CORE C RANK Cronin B, 2006, J AM SOC INF SCI TEC, V57, P1275, DOI 10.1002/asi.20354 Derby B., 2008, NATURE BLOGS 0425 Egghe L, 2010, ANNU REV INFORM SCI, V44, P65 Egghe L., 2006, ISSI NEWSLETTER, V2, P8 Egghe L, 2008, INFORM PROCESS MANAG, V44, P770, DOI 10.1016/j.ipm.2007.05.003 FLOYD RW, 1962, COMMUN ACM, V5, P345, DOI 10.1145/367766.368168 Glanzel W., 2006, SCI FOCUS, V1, P10 Hirsch JE, 2005, P NATL ACAD SCI USA, V102, P16569, DOI 10.1073/pnas.0507655102 Jin BH, 2007, CHINESE SCI BULL, V52, P855, DOI 10.1007/s11434-007-0145-9 Katsaros D, 2009, J AM SOC INF SCI TEC, V60, P1051, DOI 10.1002/asi.21040 Kelly CD, 2006, TRENDS ECOL EVOL, V21, P167, DOI 10.1016/j.tree.2006.01.005 Milgram S., 1967, PSYCHOL TODAY, V2, P60, DOI DOI 10.1145/335305.335325 Purvis A, 2006, TRENDS ECOL EVOL, V21, P422, DOI 10.1016/j.tree.2006.05.014 Rousseau R, 2006, SCI FOCUS, V1, P16 Schreiber M, 2007, EPL-EUROPHYS LETT, V78, DOI 10.1209/0295-5075/78/30002 Serenko A, 2010, J INFORMETR, V4, P447, DOI 10.1016/j.joi.2010.04.001 Sugeno M, 1974, THESIS TOKYO I TECHN *THOMS SCI, WEB KNOWL Torra V, 2008, IEEE T FUZZY SYST, V16, P795, DOI 10.1109/TFUZZ.2007.896327 van Eck NJ, 2008, J INFORMETR, V2, P263, DOI 10.1016/j.joi.2008.09.004 Wu Q, 2010, J AM SOC INF SCI TEC, V61, P609, DOI 10.1002/asi.21276 Zhivotovsky LA, 2008, SCIENTOMETRICS, V77, P373, DOI 10.1007/s11192-006-1716-2 NR 29 TC 7 Z9 7 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 1751-1577 J9 J INFORMETR JI J. Informetr. PD APR PY 2011 VL 5 IS 2 BP 248 EP 264 DI 10.1016/j.joi.2010.11.001 PG 17 WC Information Science & Library Science SC Information Science & Library Science GA 732AV UT WOS:000288154700002 ER PT J AU Bornmann, L Daniel, HD AF Bornmann, Lutz Daniel, Hans-Dieter TI The citation speed index: A useful bibliometric indicator to add to the h index SO JOURNAL OF INFORMETRICS LA English DT Article DE Citation speed; h index; Citation speed index AB The scientific impact of a publication can be determined not only based on the number of times it is cited but also based on the citation speed with which its content is noted by the scientific community. Here we present the citation speed index as a meaningful complement to the h index: whereas for the calculation of the h index the impact of publications is based on number of citations, for the calculation of the speed index it is the number of months that have elapsed since the first citation, the citation speed with which the results of publications find reception in the scientific community. The speed index is defined as follows: a group of papers has the index s if for s of its N(p) papers the first citation was at least s months ago, and for the other (N(p) - s) papers the first citation was <= s months ago. (C) 2010 Elsevier Ltd. All rights reserved. C1 [Bornmann, Lutz; Daniel, Hans-Dieter] Swiss Fed Inst Technol, Professorship Social Psychol & Res Higher Educ, CH-8092 Zurich, Switzerland. [Daniel, Hans-Dieter] Univ Zurich, Evaluat Off, CH-8001 Zurich, Switzerland. RP Bornmann, L (reprint author), Swiss Fed Inst Technol, Professorship Social Psychol & Res Higher Educ, Zahringerstr 24, CH-8092 Zurich, Switzerland. EM bornmann@gess.ethz.ch; daniel@evaluation.uzh.ch RI Daniel, Hans-Dieter/A-2419-2013; Bornmann, Lutz/A-3926-2008; Mafutsana, Mopedi/C-5157-2015 OI Bornmann, Lutz/0000-0003-0810-7091; CR Alonso S, 2009, J INFORMETR, V3, P273, DOI 10.1016/j.joi.2009.04.001 Bornmann L, 2009, EMBO REP, V10, P2, DOI 10.1038/embor.2008.233 Bornmann L, 2007, J AM SOC INF SCI TEC, V58, P1381, DOI 10.1002/asi.20609 Bornmann L, 2010, J INFORMETR, V4, P83, DOI 10.1016/j.joi.2009.09.001 Hirsch JE, 2005, P NATL ACAD SCI USA, V102, P16569, DOI 10.1073/pnas.0507655102 Panaretos J, 2009, SCIENTOMETRICS, V81, P635, DOI 10.1007/s11192-008-2174-9 SCHUBERT A, 1986, CZECH J PHYS, V36, P121, DOI 10.1007/BF01599743 van Dalen HP, 2005, SCIENTOMETRICS, V64, P209, DOI 10.1007/s11192-005-0248-5 NR 8 TC 7 Z9 7 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 1751-1577 J9 J INFORMETR JI J. Informetr. PD JUL PY 2010 VL 4 IS 3 BP 444 EP 446 DI 10.1016/j.joi.2010.03.007 PG 3 WC Information Science & Library Science SC Information Science & Library Science GA 607YQ UT WOS:000278543600026 ER PT J AU Quirin, A Cordon, O Vargas-Quesada, B de Moya-Anegon, F AF Quirin, Arnaud Cordon, Oscar Vargas-Quesada, Benjamin de Moya-Anegon, Felix TI Graph-based data mining: A new tool for the analysis and comparison of scientific domains represented as scientograms SO JOURNAL OF INFORMETRICS LA English DT Article DE Domain analysis; Social networks; Scientograms; Graph-based data mining; Scientogram mining; Subdue algorithm ID SCIENCE-CITATION-INDEX; COCITATION NETWORKS; PATHFINDER NETWORKS; MAPS; ALGORITHM; SPECIALTIES; LITERATURES; CATEGORIES; EVOLUTION AB The creation of some kind of representations depicting the current state of Science (or scientograms) is an established and beaten track for many years now. However, if we are concerned with the automatic comparison, analysis and understanding of a set of scientograms, showing for instance the evolution of a scientific domain or a face-to-face comparison of several countries, the task is titanically complex as the amount of data to analyze becomes huge and complex. In this paper, we aim to show that graph-based data mining tools are useful to deal with scientogram analysis. Subdue, the first algorithm proposed in the graph mining area, has been chosen for this purpose. This algorithm has been customized to deal with three different scientogram analysis tasks regarding the evolution of a scientific domain over time, the extraction of the common research categories substructures in the world, and the comparison of scientific domains between different countries. The outcomes obtained in the developed experiments have clearly demonstrated the potential of graph mining tools in scientogram analysis. (C) 2010 Elsevier Ltd. All rights reserved. C1 [Quirin, Arnaud; Cordon, Oscar] European Ctr Soft Comp, Mieres 33600, Spain. [Vargas-Quesada, Benjamin] Univ Granada, Commun & Informat Sci Fac, E-18071 Granada, Spain. [Vargas-Quesada, Benjamin] CSIC, Unidad Asociada, Grp Scimago, Granada 18071, Spain. [de Moya-Anegon, Felix] CSIC, CCHS, IPP, Madrid 28037, Spain. RP Cordon, O (reprint author), European Ctr Soft Comp, Edf Cient Tecnol, Mieres 33600, Spain. 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Informetr. PD JUL PY 2010 VL 4 IS 3 BP 291 EP 312 DI 10.1016/j.joi.2010.01.004 PG 22 WC Information Science & Library Science SC Information Science & Library Science GA 607YQ UT WOS:000278543600009 ER PT J AU Rao, IKR Srivastava, D AF Rao, I. K. Ravichandra Srivastava, Divya TI Growth of journals, articles and authors in malaria research SO JOURNAL OF INFORMETRICS LA English DT Article DE Growth of literature; Multiple linear regression model; Malaria research ID SCIENCE AB In the present study we have tried to trace the growth of malaria research at Global Level and the distribution of articles in various journals for the period 1955-2005. The data have been extracted from a database, which has been developed in-house from MEDLINE, SCI, TDB, Ovid Heath Information and Indian Science Abstracts. Study indicates that the exponential model fits the data on journals, articles and authors. The R(2) value for the trend for journals, articles, and authors are 0.9502, 0.9475, and 0.9651, respectively. The growth rates for journals, articles and authors are 5.31%, 7.38%, and 10.06%, respectively. The linear multiple regression equation that Articles =-39.2771 + 3.61719*journals + 0.085882*Authors (R(2) = 99.16%) is most meaningful and it may be used to estimate the articles for given numbers of journals and authors. (C) 2009 Elsevier Ltd. All rights reserved. C1 [Rao, I. K. Ravichandra] Indian Stat Inst, Documentat Res & Training Ctr, Bangalore 560059, Karnataka, India. [Srivastava, Divya] Indian Council Med Res HQ, Scientometr Unit, New Delhi 110029, India. RP Rao, IKR (reprint author), Indian Stat Inst, Documentat Res & Training Ctr, Bangalore 560059, Karnataka, India. EM ikrrao@hotmail.com; drdivya.srivastava@gmail.com CR ANDERSON J, 1996, 7 PRISM, P1 Bradford S. 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Informetr. PD JUL PY 2010 VL 4 IS 3 BP 249 EP 256 DI 10.1016/j.joi.2009.12.003 PG 8 WC Information Science & Library Science SC Information Science & Library Science GA 607YQ UT WOS:000278543600005 ER PT J AU Egghe, L AF Egghe, L. TI Characteristic scores and scales based on h-type indices SO JOURNAL OF INFORMETRICS LA English DT Article DE Characteristic scores and scales; CSS; h-index; g-index; R-index; h((2))-index; g((2))-index AB Based on the rank-order citation distribution of e. g. a researcher, one can define certain points on this distribution, hereby summarizing the citation performance of this researcher. Previous work of Glanzel and Schubert defined these so-called "characteristic scores and scales" (CSS), based on average citation data of samples of this ranked publication-citation list. In this paper we will define another version of CSS, based on diverse h-type indices such as the h-index, the g-index, the Kosmulski's h((2))-index and the g-variant of it, the g((2))-index. Mathematical properties of these new CSS are proved in a Lotkaian framework. These CSS also provide an improvement of the single h-type indices in the sense that they give h-type index values for different parts of the ranked publication-citation list. (C) 2009 Elsevier Ltd. All rights reserved. C1 Univ Hasselt, B-3590 Diepenbeek, Belgium. RP Egghe, L (reprint author), Univ Hasselt, Campus Diepenbeek, B-3590 Diepenbeek, Belgium. 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Informetr. PD JAN PY 2010 VL 4 IS 1 BP 14 EP 22 DI 10.1016/j.joi.2009.06.001 PG 9 WC Information Science & Library Science SC Information Science & Library Science GA 530ZI UT WOS:000272631100002 ER PT J AU Meyer, ET Schroeder, R AF Meyer, Eric T. Schroeder, Ralph TI Untangling the web of e-Research: Towards a sociology of online knowledge SO JOURNAL OF INFORMETRICS LA English DT Article DE e-Research; e-Science; Cyberinfrastructure; Sociology of knowledge; Sociology of science ID SCIENCE; SCOPUS AB e-Research is a rapidly growing research area, both in terms of publications and in terms of funding. In this article we argue that it is necessary to reconceptualize the ways in which we seek to measure and understand e-Research by developing a sociology of knowledge based on our understanding of how science has been transformed historically and shifted into online forms. Next, we report data which allows the examination of e-Research through a variety of traces in order to begin to understand how knowledge in the realm of e-Research has been and is being constructed. These data indicate that e-Research has had a variable impact in different fields of research. We argue that only an overall account of the scale and scope of e-Research within and between different fields makes it possible to identify the organizational coherence and diffuseness of e-Research in terms of its socio-technical networks, and thus to identify the contributions of e-Research to various research fronts in the online production of knowledge. (C) 2009 Elsevier Ltd. All rights reserved. C1 [Meyer, Eric T.; Schroeder, Ralph] Univ Oxford, Oxford Internet Inst, Oxford OX1 3JS, England. RP Meyer, ET (reprint author), Univ Oxford, Oxford Internet Inst, 1 St Giles, Oxford OX1 3JS, England. 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Informetr. PD JUL PY 2009 VL 3 IS 3 BP 246 EP 260 DI 10.1016/j.joi.2009.03.006 PG 15 WC Information Science & Library Science SC Information Science & Library Science GA 459WT UT WOS:000267144200008 ER PT J AU Perianes-Rodriguez, A Chinchilla-Rodriguez, Z Vargas-Quesada, B Olmeda-Gomez, C Moya-Anegon, F AF Perianes-Rodriguez, Antonio Chinchilla-Rodriguez, Zaida Vargas-Quesada, Benjamin Olmeda-Gomez, Carlos Moya-Anegon, Felix TI Synthetic hybrid indicators based on scientific collaboration to quantify and evaluate individual research results SO JOURNAL OF INFORMETRICS LA English DT Article DE Scientific collaboration; Bibliometric analysis; Network analysis; Hybrid indicators ID FINITE-STATE GRAPHS; CO-AUTHORSHIP; RESEARCH PERFORMANCE; RESEARCH PRODUCTIVITY; RESEARCH COMMUNITY; NETWORK ANALYSIS; PUBLICATION; SCIENCE; IMPACT; TEAMS AB Governmental initiatives around scientific policy have progressively raised collaboration to priority status. In this context, a need has arisen to broaden the traditional approach to the analysis and study of research results by descending to the group or even the individual scale and supplementing the output-, productivity-, visibility- and impact-based focus with new measures that emphasize collaboration from the vantage of structural analysis. To this end, the present paper proposes new hybrid indicators for the analysis and evaluation of individual research results, popularity and prestige, that combine bibliometric and structural aspects. A case study was conducted of the nine most productive departments in Carlos III University of Madrid. The findings showed hybridization to be a tool sensitive to traditional indicators, but also to the new demands of modern science as a self-organized system of interaction among individuals, furnishing information on researchers' environments and the behaviour and attitudes adopted within those environments. (C) 2008 Elsevier Ltd. All rights reserved. C1 [Perianes-Rodriguez, Antonio; Olmeda-Gomez, Carlos] Univ Carlos III Madrid, Dept Lib & Informat Sci, E-28903 Getafe, Spain. [Vargas-Quesada, Benjamin] Univ Granada, Dept Informat Sci, Granada, Spain. [Chinchilla-Rodriguez, Zaida; Moya-Anegon, Felix] CSIC, Inst Publ Good & Policies, Madrid, Spain. RP Perianes-Rodriguez, A (reprint author), Univ Carlos III Madrid, Dept Lib & Informat Sci, Res Grp, C Madrid 128, Madrid 28903, Spain. EM antonio.perianes@uc3m.es RI Jimenez-Fanjul, Noelia/G-1253-2010; Moya Anegon, Felix/C-4004-2009; Olmeda-Gomez, Carlos/A-3525-2009; Perianes-Rodriguez, Antonio/A-1917-2010; Chinchilla-Rodriguez, Zaida/B-5231-2012; Wencong, LI/N-6423-2013; Vargas-Quesada, Benjamin/L-7222-2014 OI Moya Anegon, Felix/0000-0002-0255-8628; Olmeda-Gomez, Carlos/0000-0001-5955-6423; Perianes-Rodriguez, Antonio/0000-0002-1188-3481; Chinchilla-Rodriguez, Zaida/0000-0002-1608-4478; CR Acedo FJ, 2006, J MANAGE STUD, V43, P957, DOI 10.1111/j.1467-6486.2006.00625.x Aksnes DW, 2004, SCIENTOMETRICS, V59, P213, DOI 10.1023/B:SCIE.0000018529.58334.eb Barabasi AL, 1999, PHYSICA A, V272, P173, DOI 10.1016/S0378-4371(99)00291-5 Barabasi A.-L, 2002, LINKED NEW SCI NETWO BATAGELJ V, 2004, PAJEK REFERENCE MANU Beaver D. deB., 1978, Scientometrics, V1, DOI 10.1007/BF02016840 BEAVER DD, 1979, SCIENTOMETRICS, V1, P133, DOI 10.1007/BF02016966 *BERGSTR LAB, 2008, EIG Bjorneborn L., 2004, THESIS ROYAL SCH LIB Bollen J, 2006, SCIENTOMETRICS, V69, P669, DOI 10.1007/s11192-006-0176-z Bonaccorsi A, 2003, SCIENTOMETRICS, V58, P49, DOI 10.1023/A:1025427507552 Bordons M., 1999, REV ESPANOLA DOCUMEN, V23, P333 BORDONS M, 1995, INT C INT SOC SCIENT, P83 Bordons M, 1997, SCIENTOMETRICS, V40, P423, DOI 10.1007/BF02459290 Borner K, 2005, COMPLEXITY, V10, P57, DOI 10.1002/cplx.20078 BRAUN T, 1995, SCIENTOMETRICS, V33, P131, DOI 10.1007/BF02020565 Calero C, 2006, SCIENTOMETRICS, V66, P365, DOI 10.1007/s11192-006-0026-z COHEN JE, 1991, SCIENTOMETRICS, V20, P395, DOI 10.1007/BF02019761 COLMAN AM, 1995, SCIENTOMETRICS, V32, P49, DOI 10.1007/BF02020188 Degenne A., 1999, INTRO SOCIAL NETWORK Galvez C, 2006, SCIENTOMETRICS, V69, P323, DOI 10.1007/s11192-006-0156-3 Galvez C, 2007, J AM SOC INF SCI TEC, V58, P1960, DOI 10.1002/asi.20671 Galvez C, 2007, SCIENTOMETRICS, V70, P3, DOI 10.1007/s11192-007-0101-0 Garcia-Aracil A, 2006, SCIENTOMETRICS, V67, P213, DOI 10.1556/Scient.67.2006.2.5 Gauffriau M, 2007, SCIENTOMETRICS, V73, P175, DOI 10.1007/s11192-007-1800-2 Genest C, 2001, SCIENTOMETRICS, V51, P429, DOI 10.1023/A:1012761903614 GOMEZ CO, 2005, ENCUENTROS INT SISTE, V10 Hanneman R.A., 2005, INTRO SOCIAL NETWORK Herrero Reyes, 2000, POLITICA SOC, V33, P199 Hirsch JE, 2005, P NATL ACAD SCI USA, V102, P16569, DOI 10.1073/pnas.0507655102 KATZ JS, 1992, THESIS U SUSSEX BRIG Katz JS, 1997, RES POLICY, V26, P1, DOI 10.1016/S0048-7333(96)00917-1 Kretschmer H, 1997, SCIENTOMETRICS, V40, P579, DOI 10.1007/BF02459302 Laudel G, 2002, RES EVALUAT, V11, P3, DOI 10.3152/147154402781776961 Lee CK, 2003, SCIENTOMETRICS, V56, P95, DOI 10.1023/A:1021902724734 Leydesdorff L, 2006, J AM SOC INF SCI TEC, V57, P1616, DOI 10.1002/asi.20335 Liu XM, 2005, INFORM PROCESS MANAG, V41, P1462, DOI 10.1016/j.ipm.2005.03.012 Mahlck P, 2000, SCIENTOMETRICS, V49, P81, DOI 10.1023/A:1005661208810 Melin G, 1996, SCIENTOMETRICS, V36, P363, DOI 10.1007/BF02129600 MIQUEL JF, 1989, RECHERCHE, V20, P116 Moed HF, 1998, SCIENTOMETRICS, V43, P231, DOI 10.1007/BF02458409 MOLASGALLART J, 2002, 66 IPTS MOLINA JL, 2000, C NAC PSIC SOC 6 OV MOLINA JL, 2002, REDES PUBLICACIONES, P3 Mrvar A., 2000, NETWORK ANAL USING P Noyons ECM, 1999, SCIENTOMETRICS, V46, P591, DOI 10.1007/BF02459614 Otte E, 2002, J INFORM SCI, V28, P441, DOI 10.1177/016555150202800601 PRICE DJD, 1976, J AM SOC INFORM SCI, V27, P292, DOI 10.1002/asi.4630270505 QURASHI MM, 1993, SCIENTOMETRICS, V27, P19, DOI 10.1007/BF02017753 Rey-Rocha J, 2006, SCIENTOMETRICS, V69, P183, DOI 10.1007/s11192-006-0149-2 Rey-Rocha J, 2002, SCIENTOMETRICS, V55, P137, DOI 10.1023/A:1016059222182 Rogers E.M., 1981, COMMUNICATION NETWOR SCImago Research Group, 2007, SCIMAGO J COUNTRY RA Seglen PO, 2000, SCIENTOMETRICS, V49, P125, DOI 10.1023/A:1005665309719 Smith David, 2000, COLLABORATIVE APPROA Strogatz S H, 1998, NATURE, V440, P442 SUBRAMANYAM K, 1983, J INFORM SCI, V6, P33, DOI 10.1177/016555158300600105 *THOMS REUT, 2008, THOMS SCI IMP FACT Tijssen RJW, 2002, SCIENTOMETRICS, V54, P381, DOI 10.1023/A:1016082432660 van Leeuwen TN, 2005, SCIENTOMETRICS, V63, P357, DOI 10.1007/s11192-005-0217-z Vargas-Quesada B., 2007, VISUALIZING STRUCTUR Vuckovic-Dekic L, 2003, ARCH ONCOLOGY, V11, P211, DOI 10.2298/AOO0303211V Wagner CS, 2005, RES POLICY, V34, P1608, DOI 10.1016/j.respol.2005.08.002 White HD, 2003, J AM SOC INF SCI TEC, V54, P1250, DOI 10.1002/asi.10325 ZULUETA MA, 1999, RES EVALUAT, V8, P111, DOI 10.3152/147154499781777612 NR 65 TC 7 Z9 7 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 1751-1577 J9 J INFORMETR JI J. Informetr. PD APR PY 2009 VL 3 IS 2 BP 91 EP 101 DI 10.1016/j.joi.2008.12.001 PG 11 WC Information Science & Library Science SC Information Science & Library Science GA 420VM UT WOS:000264317300001 ER PT J AU Egghe, L AF Egghe, L. TI The influence of merging on h-type indices SO JOURNAL OF INFORMETRICS LA English DT Article DE merging; h-index; g-index; R-index; weighted h-index AB Each information production process has a unique h-index. This paper studies the problem: what are possible h-index values if we merge two or more IPPs? First the paper gives examples of IPP mergings. There are at least two types: one where common sources add their number of items and one where common sources get the maximum of their number of items in the two IPPs. In each case we show that max(h(1), h(2)) <= h <= h(1) + h(2) for both types of mergings (h(i), i = 1, 2 the h-index in the two IPPs; h is the h-index in the merged one). We show that the above inequalities cannot be improved ( in both merging types). We also show that the same inequalities are true for the g-index and the R-index but that they are false for the weighted h-index. For the R-index we can even refine the above inequality R <= root R-1(2) + R-2(2) < R-1 + R-2. (C) 2008 Elsevier Ltd. All rights reserved. C1 [Egghe, L.] Univ Antwerp, B-2000 Antwerp, Belgium. [Egghe, L.] Univ Hasselt UHasselt, B-3590 Diepenbeek, Belgium. RP Egghe, L (reprint author), Univ Antwerp, Stadscampus,Venusstraat 35, B-2000 Antwerp, Belgium. EM leo.egghe@uhasselt.be CR EGGHE L, 1988, SCIENTOMETRICS, V14, P493, DOI 10.1007/BF02017105 Egghe L, 2006, SCIENTOMETRICS, V69, P131, DOI 10.1007/s11192-006-0144-7 EGGHE L, 2007, INFORM PROCESSING MA, V44, P770 Egghe L, 2005, LIBR INFORM SCI SER, P1 Egghe L, 2006, SCIENTOMETRICS, V69, P121, DOI 10.1007/s11192-006-0143-8 GROOS OV, 1967, AM DOC, V18, P46, DOI 10.1002/asi.5090180108 Hirsch JE, 2005, P NATL ACAD SCI USA, V102, P16569, DOI 10.1073/pnas.0507655102 Jin BH, 2007, CHINESE SCI BULL, V52, P855, DOI 10.1007/s11434-007-0145-9 ROUSSEAU R, 1989, CHINESE SCI BULL, V15, P305 SCHREIBER M, 2007, ARXIV07074577V1PHYSI Vanclay JK, 2007, J AM SOC INF SCI TEC, V58, P1547, DOI 10.1002/asi.20616 NR 11 TC 7 Z9 7 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 1751-1577 EI 1875-5879 J9 J INFORMETR JI J. Informetr. PD JUL PY 2008 VL 2 IS 3 BP 252 EP 262 DI 10.1016/j.joi.2008.06.002 PG 11 WC Information Science & Library Science SC Information Science & Library Science GA 327ZQ UT WOS:000257767400009 ER PT J AU Kostoff, RN Geisler, E AF Kostoff, Ronald N. Geisler, Elie TI The unintended consequences of metrics in technology evaluation SO JOURNAL OF INFORMETRICS LA English DT Article DE metrics; research evaluation; scientometrics; research policy; research documentation; science and technology; strategic management; unintended consequences ID RESEARCH-AND-DEVELOPMENT; PERFORMANCE-MEASUREMENT; STRATEGY; SCIENCE; INNOVATION; SEARCH; SYSTEM; IMPACT AB This paper describes science and technology (S&T) metrics, especially impact of metrics on strategic management. The main messages to be conveyed from this paper are: (1) metrics play many roles in supporting management of the S&T enterprise; (2) metrics can influence S&T development incentives; (3) incorrect selection and implementation of metrics can have negative unintended consequences on the research and research documentation generated and (4) before implementing metrics, an organization should identify and evaluate the intended and unintended consequences of the specific metrics' implementation, and identify the impact of these consequences on the organization's core mission. (c) 2007 Elsevier Ltd. All rights reserved. C1 [Kostoff, Ronald N.] Off Naval Res, Arlington, VA 22217 USA. [Geisler, Elie] IIT, Stuart Sch Business, Chicago, IL 60661 USA. RP Kostoff, RN (reprint author), Off Naval Res, 875 N Randolph St, Arlington, VA 22217 USA. EM kostofr@onr.navy.mil CR Shupe C., 2006, Information Management Journal, V40 *COUNC COMP, 2004, NAT INN IN REP INN A COUZZARIN B, 2006, EC INNOVATION NEW TE, V15, P195 Das SS, 2000, MANAGE SCI, V46, P1300, DOI 10.1287/mnsc.46.10.1300.12276 Egghe L., 1990, INTRO INFORMETRICS Q Ethiraj SK, 2004, ADMIN SCI QUART, V49, P404 Galbraith J.K., 1985, ANATOMY POWER Geisler E., 2000, METRICS SCI TECHNOLO GEISLER E, 1995, IEEE T ENG MANAGE, V41, P3 Godener A, 2004, R&D MANAGE, V34, P191, DOI 10.1111/j.1467-9310.2004.00333.x Kaplan R., 2006, ALIGNMENT USING BALA Kaplan R. 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Informetr. PD APR PY 2007 VL 1 IS 2 BP 103 EP 114 DI 10.1016/j.joi.2007.02.002 PG 12 WC Information Science & Library Science SC Information Science & Library Science GA 269JI UT WOS:000253644900001 ER PT J AU Abramo, G Cicero, T D'Angelo, CA AF Abramo, Giovanni Cicero, Tindaro D'Angelo, Ciriaco Andrea TI The impact of unproductive and top researchers on overall university research performance SO JOURNAL OF INFORMETRICS LA English DT Article DE Research evaluation; Bibliometrics; Rankings; Productivity; Top researchers; Universities ID RESEARCH PRODUCTIVITY; SYSTEMS; INDEX AB Unlike competitive higher education systems, non-competitive systems show relatively uniform distributions of top researchers and low performers among universities. In this study, we examine the impact of unproductive and top faculty members on overall research performance of the university they belong to. Furthermore, we analyze the potential relationship between research productivity of a university and the indexes of concentration of unproductive and top researchers. Research performance is evaluated using a bibliometric approach, through publications indexed on the Web of Science between 2004 and 2008. The set analyzed consists of all Italian universities active in the hard sciences. (C) 2012 Elsevier Ltd. All rights reserved. C1 [Abramo, Giovanni] Natl Res Council Italy, Inst Syst Anal & Comp Sci IASI CNR, Rome, Italy. [Abramo, Giovanni; Cicero, Tindaro; D'Angelo, Ciriaco Andrea] Univ Roma Tor Vergata, Dept Management, Sch Engn, Lab Studies Res & Technol Transfer, Rome, Italy. RP Abramo, G (reprint author), Univ Roma Tor Vergata, Dept Management, Sch Engn, Lab Studies Res & Technol Transfer, Rome, Italy. EM giovanni.abramo@uniroma2.it CR Abramo G, 2012, HIGH EDUC, V63, P701, DOI 10.1007/s10734-011-9471-6 Abramo G, 2011, SCIENTOMETRICS, V88, P915, DOI 10.1007/s11192-011-0426-6 Abramo G, 2008, RES EVALUAT, V17, P111, DOI 10.3152/095820208X280916 Abramo G, 2011, SCIENTOMETRICS, V86, P347, DOI 10.1007/s11192-010-0297-2 Abramo G, 2011, SCIENTOMETRICS, V87, P641, DOI 10.1007/s11192-011-0355-4 Abramo G, 2012, J INFORMETR, V6, P155, DOI 10.1016/j.joi.2011.11.007 [Anonymous], 2012, WORLD AC RANK 2011 2 [Anonymous], QS QUACQUARELLI SYMO D'Angelo CA, 2011, J AM SOC INF SCI TEC, V62, P257, DOI 10.1002/asi.21460 Egghe L, 2006, SCIENTOMETRICS, V69, P131, DOI 10.1007/s11192-006-0144-7 Halffman W, 2010, MINERVA, V48, P55, DOI 10.1007/s11024-010-9141-3 Hicks D, 2012, RES POLICY, V41, P251, DOI 10.1016/j.respol.2011.09.007 Hirsch JE, 2005, P NATL ACAD SCI USA, V102, P16569, DOI 10.1073/pnas.0507655102 Horta H., 2008, SCI PUBL POLICY, V35, P146, DOI 10.3152/030234208X299044 Leydesdorff L, 2008, J AM SOC INF SCI TEC, V59, P278, DOI 10.1002/asi.20743 Lundberg J, 2007, J INFORMETR, V1, P145, DOI 10.1016/j.joi.2006.09.007 Moed HF, 2005, INFORM SCI KNOWL MAN, V9, P1, DOI 10.1007/1-4020-3714-7 Osterloh M., 2008, WORKSH PEER REV REV PRICE DJD, 1976, J AM SOC INFORM SCI, V27, P292, DOI 10.1002/asi.4630270505 SJTU-Shanghai Jiao Tong University, 2011, AC RANK WORLD U van der Ploeg F, 2008, CESIFO ECON STUD, V54, P99, DOI 10.1093/cesifo/ifn015 NR 21 TC 6 Z9 6 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 1751-1577 EI 1875-5879 J9 J INFORMETR JI J. Informetr. PD JAN PY 2013 VL 7 IS 1 BP 166 EP 175 DI 10.1016/j.joi.2012.10.006 PG 10 WC Information Science & Library Science SC Information Science & Library Science GA 065BG UT WOS:000313121300020 ER PT J AU Abramo, G Cicero, T D'Angelo, CA AF Abramo, Giovanni Cicero, Tindaro D'Angelo, Ciriaco Andrea TI Individual research performance: A proposal for comparing apples to oranges SO JOURNAL OF INFORMETRICS LA English DT Article DE Research evaluation; Bibliometrics; Citations; Productivity; Standardization ID CITATION CHARACTERISTICS; SCIENCE SYSTEM; SCALING RULES; FIELD; IMPACT AB The evaluation of performance at the individual level is of fundamental importance in informing management decisions. The literature provides various indicators and types of measures, however a problem that is still unresolved and little addressed is how to compare the performance of researchers working in different fields (apples to oranges). In this work we propose a solution, testing various scaling factors for the distributions of research productivity in 174 scientific fields. The analysis is based on the observation of scientific production by all Italian university researchers active in the hard sciences over the period 2004-2008, as indexed by the Web of Science. The most effective scaling factor is the average of the productivity distribution of researchers with productivity above zero. (c) 2013 Elsevier Ltd. All rights reserved. C1 [Abramo, Giovanni] Univ Roma Tor Vergata, Natl Res Council Italy IASI CNR, Rome, Italy. [Cicero, Tindaro; D'Angelo, Ciriaco Andrea] Univ Roma Tor Vergata, Lab Studies Res & Technol Transfer, Rome, Italy. RP Abramo, G (reprint author), Univ Roma Tor Vergata, Dipartimento Ingn Impresa, Via Politecn 1, I-00133 Rome, Italy. EM giovanni.abramo@uniroma2.it; tindaro.cicero@uniroma2.it; dangelo@dii.uniroma2.it CR Abramo G, 2012, J INFORMETR, V6, P470, DOI 10.1016/j.joi.2012.03.005 Abramo G, 2007, CURR SCI INDIA, V93, P762 Abramo G, 2011, SCIENTOMETRICS, V86, P347, DOI 10.1007/s11192-010-0297-2 Costas R, 2009, J AM SOC INF SCI TEC, V60, P740, DOI 10.1002/asi.21017 D'Angelo CA, 2011, J AM SOC INF SCI TEC, V62, P257, DOI 10.1002/asi.21460 Glanzel W., 2008, P WIS 4 INT C WEB IN Hirsch JE, 2005, P NATL ACAD SCI USA, V102, P16569, DOI 10.1073/pnas.0507655102 Radicchi F, 2011, PHYS REV E, V83, DOI 10.1103/PhysRevE.83.046116 Sandstrom E., 2009, 12 INT C SCI INF JUL Sprent P., 2001, APPL NONPARAMETRIC S Thompson B., 1993, ANN M MIDS ED RES AS van Raan AFJ, 2008, J AM SOC INF SCI TEC, V59, P565, DOI 10.1002/asi.20765 Zitt M, 2005, SCIENTOMETRICS, V63, P373, DOI 10.1007/s11192-005-0218-y NR 13 TC 6 Z9 6 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 1751-1577 J9 J INFORMETR JI J. Informetr. PY 2013 VL 7 IS 2 BP 528 EP 539 DI 10.1016/j.joi.2013.01.013 PG 12 WC Information Science & Library Science SC Information Science & Library Science GA 136PY UT WOS:000318377100029 ER PT J AU Bjork, BC Solomon, D AF Bjork, Bo-Christer Solomon, David TI The publishing delay in scholarly peer-reviewed journals SO JOURNAL OF INFORMETRICS LA English DT Article DE Scholarly publishing; Review time; Processing time ID OPEN ACCESS JOURNALS; PUBLICATION DELAY; LAGS AB Publishing in scholarly peer reviewed journals usually entails long delays from submission to publication. In part this is due to the length of the peer review process and in part because of the dominating tradition of publication in issues, earlier a necessity of paper-based publishing, which creates backlogs of manuscripts waiting in line. The delays slow the dissemination of scholarship and can provide a significant burden on the academic careers of authors. Using a stratified random sample we studied average publishing delays in 2700 papers published in 135 journals sampled from the Scopus citation index. The shortest overall delays occur in science technology and medical (STM) fields and the longest in social science, arts/humanities and business/economics. Business/economics with a delay of 18 months took twice as long as chemistry with a 9 month average delay. Analysis of the variance indicated that by far the largest amount of variance in the time between submission and acceptance was among articles within a journal as compared with journals, disciplines or the size of the journal. For the time between acceptance and publication most of the variation in delay can be accounted for by differences between specific journals. (C) 2013 Elsevier Ltd. All rights reserved. C1 [Bjork, Bo-Christer] Hanken Sch Econ, Helsinki 00101, Finland. [Solomon, David] Michigan State Univ, Dept Med, E Lansing, MI 48824 USA. [Solomon, David] Michigan State Univ, OMERAD, E Lansing, MI 48824 USA. RP Solomon, D (reprint author), Michigan State Univ, Dept Med, A-202 E Fee Hall, E Lansing, MI 48824 USA. EM bo-christer.bjork@hanken.fi; dsolomon@msu.edu CR Amat CB, 2008, SCIENTOMETRICS, V74, P379, DOI 10.1007/s11192-007-1823-8 [Anonymous], 2013, JOURNALM3TRICS RES A Azar O. H., 2004, INT J SOC ECON, V31, P259, DOI 10.1108/03068290410518247 Bjork BC, 2011, J MED INTERNET RES, V13, DOI 10.2196/jmir.1802 Bjork B.C., 2006, INFORM RES, V11 Brennan R. L., 2001, GEN THEORY STAT SOCI Carroll RJ, 2001, BIOMETRICS, V57, P1, DOI 10.1111/j.0006-341X.2001.00001.x COE RK, 1967, Q REV ECON BUS, V7, P37 Diospatonyi I, 2001, J CHEM INF COMP SCI, V41, P1452, DOI 10.1021/ci010033d Dong P., 2006, SCIENTOMETRICS, V69, P271, DOI DOI 10.1007/S11192-006-0148-3 Ellison G, 2002, J POLIT ECON, V110, P947, DOI 10.1086/341868 Hartmann D. 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PY 2013 VL 7 IS 4 BP 914 EP 923 DI 10.1016/j.joi.2013.09.001 PG 10 WC Information Science & Library Science SC Information Science & Library Science GA 264ZV UT WOS:000327920400016 ER PT J AU Bornmann, L Mutz, R AF Bornmann, Lutz Mutz, Ruediger TI The advantage of the use of samples in evaluative bibliometric studies SO JOURNAL OF INFORMETRICS LA English DT Letter C1 [Bornmann, Lutz] Max Planck Gesell, Adm Headquarters, Div Sci & Innovat Studies, D-80539 Munich, Germany. [Mutz, Ruediger] ETH, Zurich, Switzerland. RP Bornmann, L (reprint author), Max Planck Gesell, Adm Headquarters, Div Sci & Innovat Studies, Hofgartenstr 8, D-80539 Munich, Germany. EM bornmann@gv.mpg.de RI Mutz, Ruediger/A-2226-2009; Bornmann, Lutz/A-3926-2008 OI Bornmann, Lutz/0000-0003-0810-7091 CR Abramo G, 2011, J INFORMETR, V5, P659, DOI 10.1016/j.joi.2011.06.004 Levy P. S., 1999, SAMPLING POPULATIONS Marx W, 2011, J AM SOC INF SCI TEC, V62, P433, DOI 10.1002/asi.21479 NR 3 TC 6 Z9 6 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 1751-1577 J9 J INFORMETR JI J. Informetr. PD JAN PY 2013 VL 7 IS 1 BP 89 EP 90 DI 10.1016/j.joi.2012.08.002 PG 2 WC Information Science & Library Science SC Information Science & Library Science GA 065BG UT WOS:000313121300009 ER PT J AU Bornmann, L Williams, R AF Bornmann, Lutz Williams, Richard TI How to calculate the practical significance of citation impact differences? An empirical example from evaluative institutional bibliometrics using adjusted predictions and marginal effects SO JOURNAL OF INFORMETRICS LA English DT Article DE Evaluative bibliometrics; Practical significance; Highly-cited papers; Average adjusted predictions; Average marginal effects; Adjusted predictions at representative values; Marginal effects at representative values ID JOURNAL IMPACT; PUBLICATION; INDICATORS AB Evaluative bibliometrics is concerned with comparing research units by using statistical procedures. According to Williams (2012) an empirical study should be concerned with the substantive and practical significance of the findings as well as the sign and statistical significance of effects. In this study we will explain what adjusted predictions and marginal effects are and how useful they are for institutional evaluative bibliometrics. As an illustration, we will calculate a regression model using publications (and citation data) produced by four universities in German-speaking countries from 1980 to 2010. We will show how these predictions and effects can be estimated and plotted, and how this makes it far easier to get a practical feel for the substantive meaning of results in evaluative bibliometric studies. An added benefit of this approach is that it makes it far easier to explain results obtained via sophisticated statistical techniques to a broader and sometimes non-technical audience. We will focus particularly on Average Adjusted Predictions (AAPs), Average Marginal Effects (AMEs), Adjusted Predictions at Representative Values (APRVs) and Marginal Effects at Representative Values (MERVs). (c) 2013 Elsevier Ltd. All rights reserved. C1 [Bornmann, Lutz] Adm Headquarters Max Planck Soc, Div Sci & Innovat Studies, D-80539 Munich, Germany. [Williams, Richard] Univ Notre Dame, Dept Sociol, Notre Dame, IN 46556 USA. RP Bornmann, L (reprint author), Adm Headquarters Max Planck Soc, Div Sci & Innovat Studies, Hofgartenstr 8, D-80539 Munich, Germany. EM bornmann@gv.mpg.de; Richard.A.Williams.5@ND.Edu RI Bornmann, Lutz/A-3926-2008 OI Bornmann, Lutz/0000-0003-0810-7091 CR Aldrich J. H., 1984, LINEAR PROBABILITY L American Psychological Association, 2009, PUBL MAN AM PSYCH AS Berry W.D., 1985, MULTIPLE REGRESSION Bornmann L, 2013, J AM SOC INF SCI TEC, V64, P587, DOI 10.1002/asi.22792 Bornmann L, 2011, J R STAT SOC A STAT, V174, P857, DOI 10.1111/j.1467-985X.2011.00689.x Bornmann L, 2013, J INFORMETR, V7, P158, DOI 10.1016/j.joi.2012.10.001 Bornmann L, 2013, J INFORMETR, V7, P89, DOI 10.1016/j.joi.2012.08.002 Bornmann L., J AM SOC IN IN PRESS Bornmann L, 2008, J DOC, V64, P45, DOI 10.1108/00220410810844150 Garfield E, 2006, JAMA-J AM MED ASSOC, V295, P90, DOI 10.1001/jama.295.1.90 Hardin J. 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Informetr. PY 2013 VL 7 IS 2 BP 562 EP 574 DI 10.1016/j.joi.2013.02.005 PG 13 WC Information Science & Library Science SC Information Science & Library Science GA 136PY UT WOS:000318377100033 ER PT J AU Ding, Y Liu, XZ Guo, C Cronin, B AF Ding, Ying Liu, Xiaozhong Guo, Chun Cronin, Blaise TI The distribution of references across texts: Some implications for citation analysis SO JOURNAL OF INFORMETRICS LA English DT Article DE Content-based citation analysis; Citation; Mentioning; Citation analysis ID SCIENCE; CLASSIFICATION; INFORMATION; INDEXES AB In citation network analysis, complex behavior is reduced to a simple edge, namely, node A cites node B. The implicit assumption is that A is giving credit to, or acknowledging, B. It is also the case that the contributions of all citations are treated equally, even though some citations appear multiply in a text and others appear only once. In this study, we apply text-mining algorithms to a relatively large dataset (866 information science articles containing 32,496 bibliographic references) to demonstrate the differential contributions made by references. We (1) look at the placement of citations across the different sections of a journal article, and (2) identify highly cited works using two different counting methods (CountOne and CountX). We find that (1) the most highly cited works appear in the Introduction and Literature Review sections of citing papers, and (2) the citation rankings produced by CountOne and CountX differ. That is to say, counting the number of times a bibliographic reference is cited in a paper rather than treating all references the same no matter how many times they are invoked in the citing article reveals the differential contributions made by the cited works to the citing paper. Published by Elsevier Ltd. C1 [Ding, Ying; Liu, Xiaozhong; Guo, Chun; Cronin, Blaise] Indiana Univ, Sch Lib & Informat Sci, Bloomington, IN 47405 USA. RP Ding, Y (reprint author), Indiana Univ, Sch Lib & Informat Sci, 1320 E 10th St, Bloomington, IN 47405 USA. 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D., 1990, SCHOLARLY COMMUNICAT, P84 NR 35 TC 6 Z9 6 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 1751-1577 J9 J INFORMETR JI J. Informetr. PY 2013 VL 7 IS 3 BP 583 EP 592 DI 10.1016/j.joi.2013.03.003 PG 10 WC Information Science & Library Science SC Information Science & Library Science GA 210UH UT WOS:000323859700002 ER PT J AU Hagen, NT AF Hagen, Nils T. TI Harmonic coauthor credit: A parsimonious quantification of the byline hierarchy SO JOURNAL OF INFORMETRICS LA English DT Article DE Byline hierarchy; Coauthor credit; Harmonic formula; Bibliometric bias; Parsimony ID MULTI-AUTHORED PAPERS; H-INDEX; PUBLICATION; CITATION; TEAMS; MODEL AB In this paper the accuracy of five current approaches to quantifying the byline hierarchy of a scientific paper is assessed by measuring the ability of each to explain the variation in a composite empirical dataset Harmonic credit explained 97% of the variation by including information about the number of coauthors and their position in the byline. In contrast, fractional credit, which ignored the byline hierarchy by allocating equal credit to all coauthors, explained less than 40% of the variation in the empirical dataset. The nearly 60% discrepancy in explanatory power between fractional and harmonic credit was accounted for by equalizing bias associated with the omission of relevant information about differential coauthor contribution. Including an additional parameter to describe a continuum of intermediate formulas between fractional and harmonic provided a negligible or negative gain in predictive accuracy. By comparison, two parametric models from the bibliometric literature both had an explanatory capacity of approximately 80%. In conclusion, the results indicate that the harmonic formula provides a parsimonious solution to the problem of quantifying the byline hierarchy. Harmonic credit allocation also accommodates specific indications of departures from the basic byline hierarchy, such as footnoted information stating that some or all coauthors have contributed equally or indicating the presence of a senior author. (C) 2013 The Author. Published by Elsevier Ltd. All rights reserved. C1 Univ Nordland, Fac Biosci & Aquaculture, N-8049 Bodo, Norway. RP Hagen, NT (reprint author), Univ Nordland, Fac Biosci & Aquaculture, N-8049 Bodo, Norway. 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Informetr. PY 2013 VL 7 IS 4 BP 784 EP 791 DI 10.1016/j.joi.2013.06.005 PG 8 WC Information Science & Library Science SC Information Science & Library Science GA 264ZV UT WOS:000327920400003 ER PT J AU Kaur, J Radicchi, F Menczer, F AF Kaur, Jasleen Radicchi, Filippo Menczer, Filippo TI Universality of scholarly impact metrics SO JOURNAL OF INFORMETRICS LA English DT Article DE Impact metrics; Discipline bias; Universality; Bibliometrics ID SCIENTIFIC IMPACT; SCIENCE; INDICATORS; INDEX AB Given the growing use of impact metrics in the evaluation of scholars, journals, academic institutions, and even countries, there is a critical need for means to compare scientific impact across disciplinary boundaries. Unfortunately, citation-based metrics are strongly biased by diverse field sizes and publication and citation practices. As a result, we have witnessed an explosion in the number of newly proposed metrics that claim to be "universal." However, there is currently no way to objectively assess whether a normalized metric can actually compensate for disciplinary bias. We introduce a new method to assess the universality of any scholarly impact metric, and apply it to evaluate a number of established metrics. We also define a very simple new metric h(s), which proves to be universal, thus allowing to compare the impact of scholars across scientific disciplines. These results move us closer to a formal methodology in the measure of scholarly impact. Published by Elsevier Ltd. C1 [Kaur, Jasleen; Radicchi, Filippo; Menczer, Filippo] Indiana Univ, Ctr Complex Networks & Syst Res, Sch Informat & Comp, Bloomington, IN 47405 USA. RP Kaur, J (reprint author), Indiana Univ, Ctr Complex Networks & Syst Res, Sch Informat & Comp, Bloomington, IN 47405 USA. EM jakaur@umail.iu.edu RI Radicchi, Filippo/B-4407-2009 CR Abbott A, 2010, NATURE, V465, P860, DOI 10.1038/465860a Batista PD, 2006, SCIENTOMETRICS, V68, P179, DOI 10.1007/s11192-006-0090-4 Bonen J., 2009, PLOS ONE, V4, pe6022 Bornmann L, 2006, SCIENTOMETRICS, V68, P427, DOI 10.1007/s11192-006-0121-1 Radicchi F, 2012, PLOS ONE, V7, DOI 10.1371/journal.pone.0033833 Colwell R., 2012, INFORMING RES CHOICE DAVIS P, 1984, AM ECON REV, V74, P225 Egghe L, 2006, SCIENTOMETRICS, V69, P131, DOI 10.1007/s11192-006-0144-7 Garfield E, 2006, JAMA-J AM MED ASSOC, V295, P90, DOI 10.1001/jama.295.1.90 Hirsch JE, 2005, P NATL ACAD SCI USA, V102, P16569, DOI 10.1073/pnas.0507655102 Kaur J, 2012, PLOS ONE, V7, DOI 10.1371/journal.pone.0043235 King DA, 2004, NATURE, V430, P311, DOI 10.1038/430311a Kinney AL, 2007, P NATL ACAD SCI USA, V104, P17943, DOI 10.1073/pnas.0704416104 Lane J, 2010, NATURE, V464, P488, DOI 10.1038/464488a Lehmann S, 2006, NATURE, V444, P1003, DOI 10.1038/4441003a Leydesdorff L, 2011, J AM SOC INF SCI TEC, V62, P2133, DOI 10.1002/asi.21609 Lundberg J, 2007, J INFORMETR, V1, P145, DOI 10.1016/j.joi.2006.09.007 Mahmoud HM, 2009, CH CRC TEXT STAT SCI, V76, P1 Menczer F., 2010, P WEB SCI C EXT FRON Moed HF, 2010, J INFORMETR, V4, P265, DOI 10.1016/j.joi.2010.01.002 Radicchi F, 2012, J INFORMETR, V6, P121, DOI 10.1016/j.joi.2011.09.002 Radicchi F, 2008, P NATL ACAD SCI USA, V105, P17268, DOI 10.1073/pnas.0806977105 Redner S, 2010, J STAT MECH-THEORY E, DOI 10.1088/1742-5468/2010/03/L03005 Schreiber M, 2008, NEW J PHYS, V10, DOI 10.1088/1367-2630/10/4/040201 Sun XL, 2013, SCI REP-UK, V3, DOI 10.1038/srep01069 Van Noorden R, 2010, NATURE, V465, P864, DOI 10.1038/465864a Waltman L, 2011, J INFORMETR, V5, P37, DOI 10.1016/j.joi.2010.08.001 NR 27 TC 6 Z9 6 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 1751-1577 EI 1875-5879 J9 J INFORMETR JI J. Informetr. PY 2013 VL 7 IS 4 BP 924 EP 932 DI 10.1016/j.joi.2013.09.002 PG 9 WC Information Science & Library Science SC Information Science & Library Science GA 264ZV UT WOS:000327920400017 ER PT J AU Milojevic, S AF Milojevic, Stasa TI Accuracy of simple, initials-based methods for author name disambiguation SO JOURNAL OF INFORMETRICS LA English DT Article DE Author name disambiguation; Simulation ID NETWORKS; SCIENCE; MEDLINE AB There are a number of solutions that perform unsupervised name disambiguation based on the similarity of bibliographic records or common coauthorship patterns. Whether the use of these advanced methods, which are often difficult to implement, is warranted depends on whether the accuracy of the most basic disambiguation methods, which only use the author's last name and initials, is sufficient for a particular purpose. We derive realistic estimates for the accuracy of simple, initials-based methods using simulated bibliographic datasets in which the true identities of authors are known. Based on the simulations in five diverse disciplines we find that the first initial method already correctly identifies 97% of authors. An alternative simple method, which takes all initials into account, is typically two times less accurate, except in certain datasets that can be identified by applying a simple criterion. Finally, we introduce a new name-based method that combines the features of first initial and all initials methods by implicitly taking into account the last name frequency and the size of the dataset. This hybrid method reduces the fraction of incorrectly identified authors by 10-30% over the first initial method. (C) 2013 Elsevier Ltd. All rights reserved. C1 Indiana Univ, Sch Informat & Comp, Dept Informat & Lib Sci, Bloomington, IN 47405 USA. RP Milojevic, S (reprint author), Indiana Univ, Sch Informat & Comp, Dept Informat & Lib Sci, Bloomington, IN 47405 USA. 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Informetr. PY 2013 VL 7 IS 4 BP 767 EP 773 DI 10.1016/j.joi.2013.06.006 PG 7 WC Information Science & Library Science SC Information Science & Library Science GA 264ZV UT WOS:000327920400001 ER PT J AU Miroiu, A AF Miroiu, Adrian TI Axiomatizing the Hirsch index: Quantity and quality disjoined SO JOURNAL OF INFORMETRICS LA English DT Article DE Scientific impact index; Hirsch index; Axiomatization; Monotonicity AB Scientific impact indexes like h are responsive to two parameters: the researcher's productivity given by the number of her published papers (an aspect of quantity) and citations (an aspect of quality). In this paper I prove that the two parameters can be treated separately: the index h can be axiomatized by appealing (1) only to axioms that allow for productivity changes, but do not require taking into account distinct situations in which a researcher's papers received different numbers of citations or (2) only to axioms that allow for changes in the number of citations received by the researcher's papers, but do not require changes in scientific productivity. The axioms used are weak. Specifically, monotonicity is avoided. (C) 2012 Elsevier Ltd. All rights reserved. C1 Natl Sch Polit & Adm Studies, Dept Polit Sci, Bucharest, Romania. RP Miroiu, A (reprint author), Natl Sch Polit & Adm Studies, Dept Polit Sci, Bucharest, Romania. EM admiroiu@snspa.ro CR Barbera S, 2004, HDB UTILITY THEORY, V2 Deineko V.G., 2009, SCIENTOMETRICS, V80, P821 Egghe L, 2010, ANNU REV INFORM SCI, V44, P65 Hirsch JE, 2005, P NATL ACAD SCI USA, V102, P16569, DOI 10.1073/pnas.0507655102 Quesada A, 2010, SCIENTOMETRICS, V82, P413, DOI 10.1007/s11192-009-0026-x Quesada A, 2011, SCIENTOMETRICS, V87, P107, DOI 10.1007/s11192-010-0307-4 Quesada A, 2009, J INFORMETR, V3, P158, DOI 10.1016/j.joi.2009.01.002 Woeginger GJ, 2008, MATH SOC SCI, V56, P224, DOI 10.1016/j.mathsocsci.2008.03.001 Woeginger GJ, 2009, J AM SOC INF SCI TEC, V60, P1267, DOI 10.1002/asi.21061 NR 9 TC 6 Z9 6 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 1751-1577 J9 J INFORMETR JI J. Informetr. PD JAN PY 2013 VL 7 IS 1 BP 10 EP 15 DI 10.1016/j.joi.2012.08.003 PG 6 WC Information Science & Library Science SC Information Science & Library Science GA 065BG UT WOS:000313121300002 ER PT J AU Schreiber, M AF Schreiber, Michael TI A case study of the arbitrariness of the h-index and the highly-cited-publications indicator SO JOURNAL OF INFORMETRICS LA English DT Article DE Citation analysis; Hirsch index; Highly-cited-publications ID SCIENTIFIC IMPACT; CITATIONS AB The arbitrariness of the h-index becomes evident, when one requires q x h instead of h citations as the threshold for the definition of the index, thus changing the size of the core of the most influential publications of a dataset. I analyze the citation records of 26 physicists in order to determine how much the prefactor q influences the ranking. Likewise, the arbitrariness of the highly-cited-publications indicator is due to the threshold value, given either as an absolute number of citations or as a percentage of highly cited papers. The analysis of the 26 citation records shows that the changes in the rankings in dependence on these thresholds are rather large and comparable with the respective changes for the h-index. (c) 2013 Elsevier Ltd. All rights reserved. C1 Tech Univ Chemnitz, Inst Phys, D-09107 Chemnitz, Germany. RP Schreiber, M (reprint author), Tech Univ Chemnitz, Inst Phys, Reichenhainer Str 70, D-09107 Chemnitz, Germany. 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Informetr. PY 2013 VL 7 IS 2 BP 379 EP 387 DI 10.1016/j.joi.2012.12.006 PG 9 WC Information Science & Library Science SC Information Science & Library Science GA 136PY UT WOS:000318377100015 ER PT J AU Vanclay, JK AF Vanclay, Jerome K. TI Factors affecting citation rates in environmental science SO JOURNAL OF INFORMETRICS LA English DT Article DE Citedness; Journal impact factor; Research impact ID OPEN-ACCESS ARTICLES; JOURNAL IMPACT FACTORS; COLLABORATION; PUBLICATIONS; FREQUENCY; QUALITY; SUCCESS AB Analysis of 131 publications during 2006-2007 by staff of the School of Environmental Science and Management at Southern Cross University reveals that the journal impact factor, article length and type (i.e., article or review), and journal self-citations affect the citations accrued to 2012. Authors seeking to be well cited should aim to write comprehensive and substantial review articles, and submit them to journals with a high impact factor which has previously carried articles on the topic. Nonetheless, strategic placement of articles is complementary to, and no substitute for careful crafting of good quality research. Evidence remains equivocal regarding the contribution of an author's prior publication success (h-index) and of open-access journals. Crown Copyright (c) 2012 Published by Elsevier Ltd. All rights reserved. C1 So Cross Univ, Lismore, NSW 2480, Australia. RP Vanclay, JK (reprint author), So Cross Univ, POB 157, Lismore, NSW 2480, Australia. 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Informetr. PY 2013 VL 7 IS 2 BP 265 EP 271 DI 10.1016/j.joi.2012.11.009 PG 7 WC Information Science & Library Science SC Information Science & Library Science GA 136PY UT WOS:000318377100002 ER PT J AU Yan, XB Zhai, L Fan, WG AF Yan, Xiangbin Zhai, Li Fan, Weiguo TI C-index: A weighted network node centrality measure for collaboration competence SO JOURNAL OF INFORMETRICS LA English DT Article DE Centrality measures; Scale-free networks; H-index; Weighted networks; Node strength ID HIRSCH-TYPE INDEXES; H-DEGREE; INDIVIDUALS; COCITATION; GRAPH AB This paper proposes a new node centrality measurement index (c-index) and its derivative indexes (iterative c-index and c(g)-index) to measure the collaboration competence of a node in a weighted network. We prove that c-index observe the power law distribution in the weighted scale-free network. A case study of a very large scientific collaboration network indicates that the indexes proposed in this paper are different from other common centrality measures (degree centrality, betweenness centrality, closeness centrality, eigenvector centrality and node strength) and other h-type indexes (lobby-index, w-lobby index and h-degree). The c-index and its derivative indexes proposed in this paper comprehensively utilize the amount of nodes' neighbors, link strengths and centrality information of neighbor nodes to measure the centrality of a node, composing a new unique centrality measure for collaborative competency. (C) 2012 Elsevier Ltd. All rights reserved. C1 [Yan, Xiangbin; Zhai, Li; Fan, Weiguo] Harbin Inst Technol, Sch Management, Harbin 150001, Peoples R China. [Zhai, Li] Harbin Univ Sci & Technol, Sch Appl Sci, Harbin 150080, Peoples R China. [Fan, Weiguo] Virginia Tech, Pamplin Coll Business, Blacksburg, VA 24061 USA. RP Yan, XB (reprint author), Harbin Inst Technol, Sch Management, Harbin 150001, Peoples R China. 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PD JAN PY 2013 VL 7 IS 1 BP 223 EP 239 DI 10.1016/j.joi.2012.11.004 PG 17 WC Information Science & Library Science SC Information Science & Library Science GA 065BG UT WOS:000313121300027 ER PT J AU Didegah, F Thelwall, M Gazni, A AF Didegah, Fereshteh Thelwall, Mike Gazni, Ali TI An international comparison of journal publishing and citing behaviours SO JOURNAL OF INFORMETRICS LA English DT Article DE Publishing behaviour; Citing behaviour; Research collaboration ID LESS-DEVELOPED-COUNTRIES; IMPACT FACTOR; SCIENTIFIC COLLABORATION; EDUCATIONAL JOURNALS; CITATION PRACTICES; LEADING JOURNALS; MEDICAL JOURNALS; INDICATORS; PUBLICATION; QUALITY AB The relationship between researchers' publishing and citing behaviours has received little examination despite its potential importance in scholarly communication, particularly at an international level. To remedy this we studied documents and their references indexed in Thomson Reuters's Web of Science (WoS) in the period 2000-2009 to compare journal publishing behaviours against journal citing behaviours across the world. The results reveal that most publications in, and citations to, all five quality based strata of journals examined come from scientifically and economically advanced countries. Nevertheless, in proportion to their total number of citations given to WoS journals, it seems that less developed countries cite high-quality journals at the same rate as developed countries and so the poorer publishing of less developed countries does not seem to be due to a lack of access to top journals. 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Informetr. PD OCT PY 2012 VL 6 IS 4 BP 516 EP 531 DI 10.1016/j.joi.2012.04.003 PG 16 WC Information Science & Library Science SC Information Science & Library Science GA 003AY UT WOS:000308581700010 ER PT J AU Rousseau, R Yang, LY AF Rousseau, Ronald Yang, Liying TI Reflections on the activity index and related indicators SO JOURNAL OF INFORMETRICS LA English DT Article DE Relative indicators; Activity index; Revealed comparative advantage index ID COMPARATIVE ADVANTAGE; IMPACT AB We point out some theoretical problems in the construction of the activity index and related indicators. Concretely, if the activity index is larger than one then it is, at least theoretically, possible to decrease its value by increasing the activity in that field. Although for some practical applications these problems do not seem to have serious consequences our investigation adds to the list of problematic indicators. As the problems we point out are due to the mathematical structure of this indicator our analysis also applies to all indicators formed in the same way, such as the revealed comparative advantage index or Balassa index. (C) 2012 Elsevier Ltd. All rights reserved. C1 [Rousseau, Ronald] KHBO Assoc KU Leuven, Fac Engn Technol, B-8400 Oostende, Belgium. [Rousseau, Ronald] Katholieke Univ Leuven, Dept Math, B-3001 Heverlee, Belgium. [Rousseau, Ronald] Univ Antwerp, IBW, B-2000 Antwerp, Belgium. [Yang, Liying] Chinese Acad Sci, Natl Sci Lib, Beijing 100190, Peoples R China. RP Rousseau, R (reprint author), KHBO Assoc KU Leuven, Fac Engn Technol, Zeedijk 101, B-8400 Oostende, Belgium. 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Informetr. PD JUL PY 2012 VL 6 IS 3 BP 413 EP 421 DI 10.1016/j.joi.2012.01.004 PG 9 WC Information Science & Library Science SC Information Science & Library Science GA 937LN UT WOS:000303660100007 ER PT J AU Sirtes, D AF Sirtes, Daniel TI Finding the Easter eggs hidden by oneself: Why Radicchi and Castellano's (2012) fairness test for citation indicators is not fair SO JOURNAL OF INFORMETRICS LA English DT Letter ID DISTRIBUTIONS; UNIVERSALITY C1 Inst Forschungsinformat & Qualitatssicherung, D-10117 Berlin, Germany. RP Sirtes, D (reprint author), Inst Forschungsinformat & Qualitatssicherung, Schutzenstr 6, D-10117 Berlin, Germany. 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PD JUL PY 2012 VL 6 IS 3 BP 448 EP 450 DI 10.1016/j.joi.2012.01.008 PG 3 WC Information Science & Library Science SC Information Science & Library Science GA 937LN UT WOS:000303660100011 ER PT J AU Mutz, R Daniel, HD AF Mutz, Ruediger Daniel, Hans-Dieter TI Skewed citation distributions and bias factors: Solutions to two core problems with the journal impact factor SO JOURNAL OF INFORMETRICS LA English DT Article DE Journal impact factor; Normalization; McCall's area transformation; Rubin Causal Model ID PUBLICATION; SCIENCE; APPROPRIATE; INDICATORS; INFERENCE; SCORES; INDEX AB The journal impact factor (JIF) proposed by Garfield in the year 1955 is one of the most prominent and common measures of the prestige, position, and importance of a scientific journal. The JIF may profit from its comprehensibility, robustness, methodological reproducibility, simplicity, and rapid availability, but it is at the expense of serious technical and methodological flaws. The paper discusses two core problems with the JIF: first, citations of documents are generally not normally distributed, and, furthermore, the distribution is affected by outliers, which has serious consequences for the use of the mean value in the JIF calculation. Second, the JIF is affected by bias factors that have nothing to do with the prestige or quality of a journal (e.g., document type). For solving these two problems, we suggest using McCall's area transformation and the Rubin Causal Model. Citation data for documents of all journals in the ISI Subject Category "Psychology, Mathematical" (Journal Citation Report) are used to illustrate the proposal. (C) 2012 Elsevier Ltd. All rights reserved. C1 [Mutz, Ruediger; Daniel, Hans-Dieter] Swiss Fed Inst Technol, CH-8001 Zurich, Switzerland. RP Mutz, R (reprint author), Swiss Fed Inst Technol, Muhlegasse 21, CH-8001 Zurich, Switzerland. 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Informetr. PD APR PY 2012 VL 6 IS 2 BP 169 EP 176 DI 10.1016/j.joi.2011.12.006 PG 8 WC Information Science & Library Science SC Information Science & Library Science GA 906RF UT WOS:000301364100002 ER PT J AU Chang, KC Chen, DZ Huang, MH AF Chang, Ke-Chiun Chen, Dar-Zen Huang, Mu-Hsuan TI The relationships between the patent performance and corporation performance SO JOURNAL OF INFORMETRICS LA English DT Article DE Patent citations; H index; Essential patent index; Current impact index ID RESEARCH-AND-DEVELOPMENT; TECHNOLOGICAL STRENGTH; MULTIPLE INDICATORS; MARKET VALUE; CITATIONS; INDEX; PRODUCTIVITY; STATISTICS; INNOVATION; RIGHTS AB This study utilizes panel regression model to explore the relationships between corporate performance and the patent performance measured from patent H index, current impact index (CII), and essential patent index (EPI) in the pharmaceutical company. 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PD JAN PY 2012 VL 6 IS 1 BP 131 EP 139 DI 10.1016/j.joi.2011.09.001 PG 9 WC Information Science & Library Science SC Information Science & Library Science GA 865QL UT WOS:000298325300016 ER PT J AU Wong, CY Goh, KL AF Wong, Chan-Yuan Goh, Kim-Leng TI The sustainability of functionality development of science and technology: Papers and patents of emerging economies SO JOURNAL OF INFORMETRICS LA English DT Article DE Functionality development; Bi-logistic growth function; Science and technology; Papers and patents; Asian emerging economies ID NATIONAL INNOVATIVE CAPACITY; LOGISTIC GROWTH; ASIAN COUNTRIES; CHINA; DIFFUSION; SINGAPORE; JAPAN; CATEGORIES; STRATEGY; DYNAMISM AB Recent development saw concerted efforts by emerging countries to transform their industrial-based economy to post-industrial knowledge-based economy. The growth of science and technology is necessary to support this economic transformation strategy. Based on the concept of functionality development of a growth model, this study attempts to analyze the dynamism and sustainability of growth in science and technology of selected Asian emerging economies. Using the number of published papers and patents as proxies, bi-logistic growth functions were fitted to examine the prolongation ability of science and technology, and the time at which each functionality development emerges. The perspective of a paradigm shift from industrial to knowledge-based economic development is taken into consideration in the analysis. The estimated prolongation ability of the newly industrialized economies (NIEs) including South Korea, Taiwan and Singapore suggests significant transformation of their innovation system that led to a higher degree of functionality, while developing economies such as China, Malaysia and Thailand show no significant change over the years. The results suggest that the NIEs have succeeded in developing new growth trajectories that are beneficial for the transformation towards a knowledge-based economy. (C) 2011 Elsevier Ltd. All rights reserved. C1 [Wong, Chan-Yuan] Univ Malaya, Fac Sci, Dept Sci & Technol Studies, Kuala Lumpur 50603, Malaysia. [Goh, Kim-Leng] Univ Malaya, Fac Econ & Adm, Kuala Lumpur 50603, Malaysia. RP Wong, CY (reprint author), Univ Malaya, Fac Sci, Dept Sci & Technol Studies, Kuala Lumpur 50603, Malaysia. 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J., 2007, INNOVATION TECHNOLOG, P127 Zhou P, 2006, RES POLICY, V35, P83, DOI 10.1016/j.respol.2005.08.006 NR 62 TC 6 Z9 6 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 1751-1577 J9 J INFORMETR JI J. Informetr. PD JAN PY 2012 VL 6 IS 1 BP 55 EP 65 DI 10.1016/j.joi.2011.07.001 PG 11 WC Information Science & Library Science SC Information Science & Library Science GA 865QL UT WOS:000298325300009 ER PT J AU Sangwal, K AF Sangwal, K. TI On the growth of citations of publication output of individual authors SO JOURNAL OF INFORMETRICS LA English DT Article DE Citations; Citation rate; Power law; Exponential growth law; Progressive nucleation mechanism ID INDEX AB Dependence of citations L(t) at time t on the publication duration t of 10 arbitrarily selected Polish professors is analyzed using equations based on power law and exponential growth and on progressive nucleation mechanism for overall crystallization in fixed volume. The former two approaches are well known in the bibliometric literature, but the last approach is new for the analysis of growth of citations and other related phenomena. It was found that: (1) power-law relation and exponential growth are relatively inadequate to analyze the data of all authors due to large scatter in the L(t) data of various authors, (2) in view of poor fit at low or high values of t, the exponential growth relation is worse than the power-law relation, and (3) the progressive nucleation mechanism describes the data reasonably well and gives information on the processes of sources of citations and the growth of theses citation sources. (C) 2011 Elsevier Ltd. All rights reserved. C1 Lublin Univ Technol, Dept Appl Phys, PL-20618 Lublin, Poland. RP Sangwal, K (reprint author), Lublin Univ Technol, Dept Appl Phys, Ul Nadbystrzycka 38, PL-20618 Lublin, Poland. EM k.sangwal@pollub.pl CR Burrell QL, 2007, J INFORMETR, V1, P170, DOI 10.1016/j.joi.2007.01.003 EGGHE L, 1992, SCIENTOMETRICS, V25, P5, DOI 10.1007/BF02016845 Gupta BM, 2002, SCIENTOMETRICS, V53, P161, DOI 10.1023/A:1014844222898 Hirsch JE, 2005, P NATL ACAD SCI USA, V102, P16569, DOI 10.1073/pnas.0507655102 Kashchiev D, 2000, NUCLEATION BASIC THE Price D.J.D.S., 1963, LITTLE SCI BIG SCI Rao IKR, 2010, J INFORMETR, V4, P249, DOI 10.1016/j.joi.2009.12.003 Wong CY, 2010, J INFORMETR, V4, P460, DOI 10.1016/j.joi.2010.04.002 NR 8 TC 6 Z9 6 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 1751-1577 J9 J INFORMETR JI J. Informetr. PD OCT PY 2011 VL 5 IS 4 BP 554 EP 564 DI 10.1016/j.joi.2011.04.007 PG 11 WC Information Science & Library Science SC Information Science & Library Science GA 841PI UT WOS:000296524200007 ER PT J AU Egghe, L AF Egghe, L. TI Characterizations of the generalized Wu- and Kosmulski-indices in Lotkaian systems SO JOURNAL OF INFORMETRICS LA English DT Article DE Generalized Wu-index; Generalized Kosmulski-index; Characterization AB We define the generalized Wu- and Kosmulski-indices, allowing for general parameters of multiplication or exponentiation. We then present formulae for these generalized indices in a Lotkaian framework. Next we characterise these indices in terms of their dependence on the quotient of the average number of items per source in the m-core divided by the overall average ( m is any generalized Wu- or Kosmulski-index). As a consequence of these results we show that the fraction of used items (used in the definition of m) in the m-core is independent of the parameter and equals one divided by the overall average. (C) 2011 Elsevier Ltd. All rights reserved. C1 [Egghe, L.] Univ Hasselt UHasselt, B-3590 Diepenbeek, Belgium. [Egghe, L.] Univ Antwerpen UA, B-2000 Antwerp, Belgium. RP Egghe, L (reprint author), Univ Hasselt UHasselt, Campus Diepenbeek, B-3590 Diepenbeek, Belgium. EM leo.egghe@uhasselt.be CR Egghe L, 2006, SCIENTOMETRICS, V69, P131, DOI 10.1007/s11192-006-0144-7 EGGHE L, 2010, ANNU REV INFORM SCI, P65 Egghe L, 2005, LIBR INFORM SCI SER, P1 Egghe L, 2006, SCIENTOMETRICS, V69, P121, DOI 10.1007/s11192-006-0143-8 Hirsch JE, 2005, P NATL ACAD SCI USA, V102, P16569, DOI 10.1073/pnas.0507655102 Jin BH, 2007, CHINESE SCI BULL, V52, P855, DOI 10.1007/s11434-007-0145-9 Kosmulski M., 2006, ISSI NEWSLETTER, V2, P4 Levitt JM, 2007, Proceedings of ISSI 2007: 11th International Conference of the International Society for Scientometrics and Informetrics, Vols I and II, P876 van Eck NJ, 2008, J INFORMETR, V2, P263, DOI 10.1016/j.joi.2008.09.004 Wu Q, 2010, J AM SOC INF SCI TEC, V61, P609, DOI 10.1002/asi.21276 NR 10 TC 6 Z9 6 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 1751-1577 J9 J INFORMETR JI J. Informetr. PD JUL PY 2011 VL 5 IS 3 BP 439 EP 445 DI 10.1016/j.joi.2011.03.006 PG 7 WC Information Science & Library Science SC Information Science & Library Science GA 769QF UT WOS:000291032500012 ER PT J AU Quesada, A AF Quesada, Antonio TI Axiomatics for the Hirsch index and the Egghe index SO JOURNAL OF INFORMETRICS LA English DT Article DE Hirsch index; Egghe index; Citation analysis; Axiomatization AB The Hirsch index and the Egghe index are both numbers that synthesize a researcher's output. The h-index associated with researcher r is the maximum number h such that r has h papers with at least h citations each. The g-index is the maximum number g of papers by r such that the average number of citations of the g papers is at least g. Both indices are characterized in terms of four axioms. One identifies outputs deserving index at most one. A second one establishes a strong monotonicity condition. A third one requires the index to satisfy a property of subadditivity. The last one consists of a monotonicity condition, for the h-index, and an aggregate monotonicity condition, for the g-index. (C) 2011 Elsevier Ltd. All rights reserved. C1 Univ Rovira & Virgili, Dept Econ, Reus 43204, Spain. RP Quesada, A (reprint author), Univ Rovira & Virgili, Dept Econ, Avinguda Univ 1, Reus 43204, Spain. EM aqa@urv.cat CR BURGOS A, 2010, RANKING SCI Egghe L, 2006, SCIENTOMETRICS, V69, P131, DOI 10.1007/s11192-006-0144-7 Egghe L., 2006, ISSI NEWSLETTER, V2, P8 Hirsch JE, 2005, P NATL ACAD SCI USA, V102, P16569, DOI 10.1073/pnas.0507655102 Marchant T, 2009, SCIENTOMETRICS, V80, P325, DOI 10.1007/s11192-008-2075-y Quesada A, 2010, SCIENTOMETRICS, V82, P413, DOI 10.1007/s11192-009-0026-x Quesada A, 2009, J INFORMETR, V3, P158, DOI 10.1016/j.joi.2009.01.002 QUESADA A, 2010, SCIENTOMETR IN PRESS Woeginger GJ, 2008, MATH SOC SCI, V56, P224, DOI 10.1016/j.mathsocsci.2008.03.001 Woeginger GJ, 2009, J AM SOC INF SCI TEC, V60, P1267, DOI 10.1002/asi.21061 Woeginger GJ, 2008, J INFORMETR, V2, P364, DOI 10.1016/j.joi.2008.05.002 Woeginger GJ, 2008, J INFORMETR, V2, P298, DOI 10.1016/j.joi.2008.09.001 NR 12 TC 6 Z9 6 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 1751-1577 J9 J INFORMETR JI J. Informetr. PD JUL PY 2011 VL 5 IS 3 BP 476 EP 480 DI 10.1016/j.joi.2011.01.009 PG 5 WC Information Science & Library Science SC Information Science & Library Science GA 769QF UT WOS:000291032500016 ER PT J AU Abramo, G D'Angelo, CA Solazzi, M AF Abramo, Giovanni D'Angelo, Ciriaco Andrea Solazzi, Marco TI Are researchers that collaborate more at the international level top performers? An investigation on the Italian university system SO JOURNAL OF INFORMETRICS LA English DT Article DE International research collaboration; Top scientist; Research performance; Bibliometrics; Italy ID CO-AUTHORSHIPS; KNOWLEDGE; ORGANIZATION AB The practice of collaboration, and particularly international collaboration, is becoming ever more widespread in scientific research, and is likewise receiving greater interest and stimulus from policy-makers. However, the relation between research performance and degree of internationalization at the level of single researchers still presents unresolved questions. The present work, through a bibliometric analysis of the entire Italian university population working in the hard sciences over the period 2001-2005, seeks to answer some of these questions. The results show that the researchers with top performance with respect to their national colleagues are also those who collaborate more abroad, but that the reverse is not always true. Also, interesting differences emerge at the sectorial level. Finally, the effect of the nation involved in the international partnership plays a role that should not be ignored. (C) 2010 Elsevier Ltd. All rights reserved. C1 [Abramo, Giovanni; D'Angelo, Ciriaco Andrea; Solazzi, Marco] Univ Roma Tor Vergata, Lab Studies Res & Technol Transfer, Sch Engn, Dept Management, I-00133 Rome, Italy. RP Abramo, G (reprint author), Univ Roma Tor Vergata, Dipartimento Ingn Impresa, Via Politecn 1, I-00133 Rome, Italy. 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Informetr. PD JAN PY 2011 VL 5 IS 1 BP 204 EP 213 DI 10.1016/j.joi.2010.11.002 PG 10 WC Information Science & Library Science SC Information Science & Library Science GA 698WS UT WOS:000285626000016 ER PT J AU Garcia-Perez, MA AF Garcia-Perez, Miguel A. TI Strange attractors in the Web of Science database SO JOURNAL OF INFORMETRICS LA English DT Article DE Citation analysis; Scientometrics ID H-INDEX; GOOGLE SCHOLAR; OF-SCIENCE; SCOPUS; CITATION; PROS; CONS; CONSEQUENCES; COVERAGE AB Accurate computation of h indices or other indicators of research impact requires access to databases supplying complete and accurate citation information. The Web of Science (WoS) database is widely used for this purpose and it is generally deemed error-free. This note describes an inaccuracy that seems to affect differentially non-English sources and targets in WoS, namely, "phantom citations" (i.e., papers reported by WoS to cite some article when they actually did not) and their concentration around particular articles that are thus dubbed "strange attractors". The analysis of references in (and citations to) papers in two English sources and two non-English sources reveals that phantom citations and other errors of indexing occur about twice as often with non-English items. These and other errors of commission affect about 1% of the cited references in the WoS database, and they may reveal large-scale problems in the reference matching algorithm in WoS. (C) 2010 Elsevier Ltd. All rights reserved. C1 Univ Complutense, Dept Metodol, Fac Psicol, Madrid 28223, Spain. RP Garcia-Perez, MA (reprint author), Univ Complutense, Dept Metodol, Fac Psicol, Campus Somosaguas, Madrid 28223, Spain. EM miguel@psi.ucm.es RI Garcia-Perez, Miguel Angel/F-7043-2011 OI Garcia-Perez, Miguel Angel/0000-0003-2669-4429 CR Bar-Ilan J, 2008, SCIENTOMETRICS, V74, P257, DOI 10.1007/s11192-008-0216-y Frandsen TF, 2008, J AM SOC INF SCI TEC, V59, P1570, DOI 10.1002/asi.20817 Garcia-Perez MA, 2010, J AM SOC INF SCI TEC, V61, P2070, DOI 10.1002/asi.21372 GLAVEL Y, 2008, ONLINE INFORM REV, V32, P8 Hirsch JE, 2005, P NATL ACAD SCI USA, V102, P16569, DOI 10.1073/pnas.0507655102 Jacso P, 2008, ONLINE INFORM REV, V32, P437, DOI 10.1108/14684520810889718 Jacso P, 2008, ONLINE INFORM REV, V32, P524, DOI 10.1108/14684520810897403 Jacso P, 2008, LIBR TRENDS, V56, P784 Jacso P, 2008, ONLINE INFORM REV, V32, P673, DOI 10.1108/14684520810914043 Levine-Clark M., 2009, J BUSINESS FINANCE L, V14, P32, DOI [DOI 10.1080/08963560802176348, 10.1080/08963560802176348] Meho LI, 2007, J AM SOC INF SCI TEC, V58, P2105, DOI 10.1002/asi.20677 Meho LI, 2008, J AM SOC INF SCI TEC, V59, P1711, DOI 10.1002/asi.20874 Norris M, 2007, J INFORMETR, V1, P161, DOI 10.1016/j.joi.2006.12.001 Osca-Lluch J, 2009, PSICOTHEMA, V21, P300 Rousseau R, 2007, J INFORMETR, V1, P2, DOI 10.1016/j.joi.2006.05.001 Vaughan L, 2008, SCIENTOMETRICS, V74, P317, DOI 10.1007/s11192-008-0220-2 Vieira ES, 2009, SCIENTOMETRICS, V81, P587, DOI 10.1007/s11192-009-2178-0 Walters WH, 2009, PORTAL-LIBR ACAD, V9, P5 NR 18 TC 6 Z9 6 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 1751-1577 J9 J INFORMETR JI J. Informetr. PD JAN PY 2011 VL 5 IS 1 BP 214 EP 218 DI 10.1016/j.joi.2010.07.006 PG 5 WC Information Science & Library Science SC Information Science & Library Science GA 698WS UT WOS:000285626000017 ER PT J AU Rodriguez, MA Shinavier, J AF Rodriguez, Marko A. Shinavier, Joshua TI Exposing multi-relational networks to single-relational network analysis algorithms SO JOURNAL OF INFORMETRICS LA English DT Article DE Multi-relational networks; Path algebra; Network analysis ID CONSTRAINED SPREADING ACTIVATION; INFORMATION-RETRIEVAL; BIOLOGICAL NETWORKS; SEMANTIC NETWORKS; WEB; CENTRALITY AB Many, if not most network analysis algorithms have been designed specifically for single-relational networks; that is, networks in which all edges are of the same type. For example, edges may either represent "friendship," "kinship," or " collaboration," but not all of them together. In contrast, a multi-relational network is a network with a heterogeneous set of edge labels which can represent relationships of various types in a single data structure. While multi-relational networks are more expressive in terms of the variety of relationships they can capture, there is a need for a general framework for transferring the many single-relational network analysis algorithms to the multi-relational domain. It is not sufficient to execute a single-relational network analysis algorithm on a multi-relational network by simply ignoring edge labels. This article presents an algebra for mapping multi-relational networks to single-relational networks, thereby exposing them to single-relational network analysis algorithms. Published by Elsevier Ltd. C1 [Rodriguez, Marko A.] Los Alamos Natl Lab, Ctr Nonlinear Studies T 5, Los Alamos, NM 87545 USA. [Shinavier, Joshua] Rensselaer Polytech Inst, Troy, NY 12180 USA. 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Informetr. PD JAN PY 2010 VL 4 IS 1 BP 29 EP 41 DI 10.1016/j.joi.2009.06.004 PG 13 WC Information Science & Library Science SC Information Science & Library Science GA 530ZI UT WOS:000272631100004 ER PT J AU Schreiber, M AF Schreiber, Michael TI How to modify the g-index for multi-authored manuscripts SO JOURNAL OF INFORMETRICS LA English DT Article DE Hirsch index; g-Index; Performance evaluation; Citations; Ranking; Coauthorship ID H-INDEX; HIRSCH INDEX; PHYSICISTS AB A recently suggested modification of the g-index is analysed in order to take multiple coauthorship appropriately into account. By fractionalised counting of the papers one can obtain an appropriate measure which I call g(m)-index. Two fictitious examples for model cases and two empirical cases are analysed. The results are compared with two other variants of the g-index which have also recently been proposed. Only the g(m)-index shows the correct behaviour when datasets are aggregated. The interpolated and continuous versions of the g-index and its variants are also discussed. For an intuitive comparison of the determination of the investigated variants of the h-index and the g-index, a visualization of the citation records is utilized. (C) 2009 Elsevier Ltd. All rights reserved. C1 Tech Univ Chemnitz, Inst Phys, D-09107 Chemnitz, Germany. RP Schreiber, M (reprint author), Tech Univ Chemnitz, Inst Phys, Reichenhainer Str 70, D-09107 Chemnitz, Germany. 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Informetr. PD JAN PY 2010 VL 4 IS 1 BP 42 EP 54 DI 10.1016/j.joi.2009.06.003 PG 13 WC Information Science & Library Science SC Information Science & Library Science GA 530ZI UT WOS:000272631100005 ER PT J AU Moreira, BL Goncalves, MA Laender, AHF Fox, EA AF Moreira, Barbara L. Goncalves, Marcos Andre Laender, Alberto H. F. Fox, Edward A. TI Automatic evaluation of digital libraries with 5SQual SO JOURNAL OF INFORMETRICS LA English DT Article DE Digital libraries; Quality assessment; 5S; 5SQual ID MODEL AB Digital libraries (DLs) are complex information systems which can present changes in their structure, content, and services. These complexities and dynamics make system maintenance a non-trivial task, since it requires periodical evaluation of the different DL components. Generally, these evaluations are customized per system and are performed only when problems occur and administrator intervention is required. This work aims to change the situation. We present 5SQual, a tool which provides ways to perform automatic and configurable evaluations of some of the most important DL components, among them, digital objects, metadata, and services. The tool implements diverse numeric indicators that are associated with eight quality dimensions described in the 5S quality model. Its generic architecture was developed to be applicable to various DLs and scenarios. In sum, the main contributions of this work include: (i) the design and implementation of 5SQual, a tool that validates a theoretical DL quality model; (ii) the demonstration of the applicability of the tool in several usage scenarios; and (iii) the evaluation (with usability specialists) of its graphical interface specially designed to guide the configuration of 5SQual evaluations. We also present the results of interviews conducted with administrators of real DLs regarding their expectations and opinions about 5SQual. (C) 2008 Elsevier Ltd. All rights reserved. C1 [Moreira, Barbara L.; Goncalves, Marcos Andre; Laender, Alberto H. F.] Univ Fed Minas Gerais, Dept Comp Sci, BR-31270901 Belo Horizonte, MG, Brazil. [Fox, Edward A.] Virginia Tech, Dept Comp Sci, Blacksburg, VA 24061 USA. RP Goncalves, MA (reprint author), Univ Fed Minas Gerais, Dept Comp Sci, BR-31270901 Belo Horizonte, MG, Brazil. EM mgoncalv@dcc.ufmg.br RI InWeb, Inct/J-9839-2013 CR COUTO T, 2006, P 6 ACM IEEE CS JOIN, P75, DOI 10.1145/1141753.1141766 Fuhr N., 2001, P EUR C DIG LIB, P187 Fuhr Norbert, 2007, International Journal on Digital Libraries, V8, DOI 10.1007/s00799-007-0011-z Goncalves MA, 2004, ACM T INFORM SYST, V22, P270, DOI 10.1145/984321.984325 Goncalves MA, 2007, INFORM PROCESS MANAG, V43, P1416, DOI 10.1016/j.ipm.2006.11.010 Goncalves M. 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PD APR PY 2009 VL 3 IS 2 BP 102 EP 123 DI 10.1016/j.joi.2008.12.003 PG 22 WC Information Science & Library Science SC Information Science & Library Science GA 420VM UT WOS:000264317300002 ER PT J AU Henneken, EA Kurtz, MJ Accomazzi, A Grant, CS Thompson, D Bohlen, E Murray, SS AF Henneken, Edwin A. Kurtz, Michael J. Accomazzi, Alberto Grant, Carolyn S. Thompson, Donna Bohlen, Elizabeth Murray, Stephen S. TI Use of astronomical literature-A report on usage patterns SO JOURNAL OF INFORMETRICS LA English DT Article DE Digital libraries; Readership statistics; Document use; Obsolescence ID ASTROPHYSICS DATA SYSTEM AB In this paper we present a number of metrics for usage of the SAO/NASA Astrophysics Data System(ADS). Since the ADS is used by the entire astronomical community, these are indicative of how the astronomical literature is used. We will show how the use of the ADS has changed both quantitatively and qualitatively. We will also show that different types of users access the system in different ways. Finally, we show how use of the ADS has evolved over the years in various regions of the world. Published by Elsevier Ltd. C1 [Henneken, Edwin A.; Kurtz, Michael J.; Accomazzi, Alberto; Grant, Carolyn S.; Thompson, Donna; Bohlen, Elizabeth; Murray, Stephen S.] Harvard Smithsonian Ctr Astrophys, Cambridge, MA 02138 USA. RP Henneken, EA (reprint author), Harvard Smithsonian Ctr Astrophys, 60 Garden St, Cambridge, MA 02138 USA. EM ehenneken@cfa.harvard.edu RI Henneken, Edwin/F-9475-2010; KURTZ, Michael /B-3890-2009 CR Chen P, 2007, J INFORMETR, V1, P8, DOI 10.1016/j.joi.2006.06.001 *DEP EC SOC AFF ST, 2007, UN WORLD STAT POCK L Fortunato S, 2006, PHYS REV LETT, V96, DOI 10.1103/PhysRevLett.96.218701 GRAY J, 2002, MSRTR200275 Henneken EA, 2007, LEARN PUBL, V20, P16, DOI 10.1087/095315107779490661 *INT TEL UN, WORLD INF SOC REP 20 Kurtz MJ, 2005, J AM SOC INF SCI TEC, V56, P36, DOI 10.1002/asi.20095 Kurtz MJ, 2000, ASTRON ASTROPHYS SUP, V143, P41, DOI 10.1051/aas:2000170 KURTZ MJ, 2003, LIB INFORM SERVICES, V4, P223 Scranton R, 2007, ARXIV07090752 Tenopir C, 2005, J AM SOC INF SCI TEC, V56, P786, DOI 10.1002/asi.20167 *UN, LDCS LEAST DEV COUNT *WORLD RES I, 2008, EARTHTRENDS DAT 2008, WORLD EC OUTLOOK APR NR 14 TC 6 Z9 6 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 1751-1577 J9 J INFORMETR JI J. Informetr. PD JAN PY 2009 VL 3 IS 1 BP 1 EP 8 DI 10.1016/j.joi.2008.10.001 PG 8 WC Information Science & Library Science SC Information Science & Library Science GA 395BI UT WOS:000262496700001 ER PT J AU Bornmann, L Mutz, R Daniel, HD AF Bornmann, Lutz Mutz, Ruediger Daniel, Hans-Dieter TI Latent Markov modeling applied to grant peer review SO JOURNAL OF INFORMETRICS LA English DT Review DE latent Markov model; latent class analysis; peer review; multi-stage evaluation process; reliability ID PREDICTIVE-VALIDITY; COMMITTEE; RELIABILITY; SELECTION; FOUNDATION; DECISIONS; FAIRNESS; PANEL; BIAS AB In the grant peer review process we can distinguish various evaluation stages in which assessors judge applications on a rating scale. Research on the grant peer review process that considers its multi-stage character scarcely exists. In this study we analyze 1954 applications for doctoral and post-doctoral fellowships from the Boehringer Ingelheim Fonds (B.I.F.), which are evaluated in three stages (first: evaluation by an external reviewer; second: internal evaluation by a staff member; third:final decision by the B. I. F. Board of Trustees). The results of a latent Markov model ( in combination with latent class analysis) show that a fellowship application has a chance of approval only if it is recommended for support already in the first evaluation stage, that is, if the external reviewer's evaluation is positive. Based on these results, a form of triage or pre-screening of applications seems desirable. (C) 2008 Elsevier Ltd. All rights reserved. C1 [Bornmann, Lutz; Mutz, Ruediger; Daniel, Hans-Dieter] ETH, Professorship Social Psychol & Res Higher Educ, CH-8092 Zurich, Switzerland. [Daniel, Hans-Dieter] Univ Zurich, Evaluat Off, CH-8006 Zurich, Switzerland. RP Bornmann, L (reprint author), ETH, Professorship Social Psychol & Res Higher Educ, Zahringerstr 24, CH-8092 Zurich, Switzerland. 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PD JUL PY 2008 VL 2 IS 3 BP 217 EP 228 DI 10.1016/j.joi.2008.05.003 PG 12 WC Information Science & Library Science SC Information Science & Library Science GA 327ZQ UT WOS:000257767400006 ER PT J AU Sarabia, JM AF Sarabia, Jose Maria TI A general definition of the Leimkuhler curve SO JOURNAL OF INFORMETRICS LA English DT Article DE productivity; cumulative distribution function; incomplete beta function; Lorenz curve ID CITATION AGE DATA; LORENZ CURVES; EGGHES CONSTRUCTION AB In this paper, we provide a general definition of the Leimkuhler curve in terms of the theoretical cumulative distribution function. The definition applies to discrete, continuous and mixed random variables. Several examples are given to illustrate the use of the formula. (C) 2008 Elsevier Ltd. All rights reserved. C1 Univ Cantabria, Dept Econ, E-39005 Santander, Spain. RP Sarabia, JM (reprint author), Univ Cantabria, Dept Econ, Avda Castros S-N, E-39005 Santander, Spain. EM sarabiaj@unican.es CR Arnold B. 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PD APR PY 2008 VL 2 IS 2 BP 156 EP 163 DI 10.1016/j.joi.2008.01.002 PG 8 WC Information Science & Library Science SC Information Science & Library Science GA 296TK UT WOS:000255568500005 ER PT J AU Jarneving, B AF Jarneving, Bo TI Complete graphs and bibliographic coupling: A test of the applicability of bibliographic coupling for the identification of cognitive cores on the field level SO JOURNAL OF INFORMETRICS LA English DT Article DE bibliographic coupling; science mapping; research fronts ID SCIENTIFIC LITERATURES; INTELLECTUAL STRUCTURE; COMBINED COCITATION; WORD ANALYSIS; SCIENCE AB The method of bibliographic coupling in combination with the complete link cluster method was applied for mapping of the field of organic chemistry with the purpose of testing the applicability of a proposed mapping method on the field level. The method put forward aimed at the generation of cognitive cores of documents, so-called 'bibliographic cliques' in the network of bibliographically coupled research articles. The defining feature of these cliques is that they can be considered complete graphs where each bibliographic coupling link ties an unordered pair of documents. In this way, it was presumed that coherent groups of documents in the research front would be found and that these groups would be intellectually coherent as well. Statistical analysis and subject specialist evaluations confirmed these presumptions. The study also elaborates on the choice of observation period and the application of thresholds in relation to the size of document populations. (c) 2007 Elsevier Ltd. All rights reserved. C1 Univ Coll Boras, Swedish Sch Library & Informat Sci, Boras, Sweden. RP Jarneving, B (reprint author), Univ Coll Boras, Swedish Sch Library & Informat Sci, Boras, Sweden. 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Bollen, Johan de Sompel, Herbert Van TI Mapping the bid behavior of conference referees SO JOURNAL OF INFORMETRICS LA English DT Article DE peer-review; referees; bid behavior ID CO-WORDS; NETWORKS AB The peer-review process, in its present form, has been repeatedly criticized. Of the many critiques ranging from publication delays to referee bias, this paper will focus specifically on the issue of how submitted manuscripts are distributed to qualified referees. Unqualified referees, without the proper knowledge of a manuscript's domain, may reject a perfectly valid study or potentially more damaging, unknowingly accept a faulty or fraudulent result. In this paper, referee competence is analyzed with respect to referee bid data collected from the 2005 Joint Conference on Digital Libraries (JCDL). The analysis of the referee bid behavior provides a validation of the intuition that referees are bidding on conference submissions with regards to the subject domain of the submission. 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PD JAN PY 2007 VL 1 IS 1 BP 68 EP 82 DI 10.1016/j.joi.2006.09.006 PG 15 WC Information Science & Library Science SC Information Science & Library Science GA 274AN UT WOS:000253974300009 ER PT J AU Wang, J AF Wang, Jian TI Unpacking the Matthew effect in citations SO JOURNAL OF INFORMETRICS LA English DT Article DE Matthew effect; Citation; Networking; Prestige; Appropriateness ID BIBLIOMETRIC STATISTICAL PROPERTIES; SCIENCE SYSTEM; SCALING RULES; CUMULATIVE ADVANTAGE; RANDOM NETWORKS; RESEARCH IMPACT; UNIVERSITIES; PERFORMANCE; ECONOMISTS AB One problem confronting the use of citation-based metrics in science studies and research evaluations is the Matthew effect. This paper reviews the role of citations in science and decomposes the Matthew effect in citations into three components: networking, prestige, and appropriateness. The networking and prestige effects challenge the validity of citation-based metrics, but the appropriateness effect does not. 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Informetr. PD APR PY 2014 VL 8 IS 2 BP 329 EP 339 DI 10.1016/j.joi.2014.01.006 PG 11 WC Information Science & Library Science SC Information Science & Library Science GA AG7PK UT WOS:000335609900004 ER PT J AU Abbasi, A Jaafari, A AF Abbasi, Alireza Jaafari, Ali TI Research impact and scholars' geographical diversity SO JOURNAL OF INFORMETRICS LA English DT Article DE Scientific collaboration network; Geographical diversity; Internal and external collaboration; Research impact; Scholars' performance ID INTERNATIONAL SCIENTIFIC COOPERATION; COAUTHORSHIP NETWORK ANALYSIS; RESEARCH COLLABORATION; ECONOMICS DEPARTMENTS; CO-AUTHORSHIPS; WORK GROUPS; PERFORMANCE; PROXIMITY; CONSEQUENCES; PRODUCTIVITY AB In recent years there has been a sharp increase in collaborations among scholars and there are studies on the effects of scientific collaboration on scholars' performance. This study examines the hypothesis that geographically diverse scientific collaboration is associated with research impact. Here, the approach is differentiated from other studies by: (a) focusing on publications rather than researchers or institutes; (b) considering the geographical diversity of authors of each publication; (c) considering the average number of citations a publication receives per year (time-based normalization of citations) as a surrogate for its impact; and (d) not focusing on a specific country (developed or developing) or region. Analysis of the collected bibliometric data shows that a publication impact is significantly and positively associated with all related geographical collaboration indicators. But publication impact has a stronger association with the numbers of external collaborations at department and institution levels (inter-departmental and inter-institutional collaborations) compared to internal collaborations. 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PY 2013 VL 7 IS 3 BP 683 EP 692 DI 10.1016/j.joi.2013.04.004 PG 10 WC Information Science & Library Science SC Information Science & Library Science GA 210UH UT WOS:000323859700012 ER PT J AU Abramo, G D'Angelo, CA Murgia, G AF Abramo, Giovanni D'Angelo, Ciriaco Andrea Murgia, Gianluca TI The collaboration behaviors of scientists in Italy: A field level analysis SO JOURNAL OF INFORMETRICS LA English DT Article DE Research collaboration; Collaboration patterns; Bibliometrics; University; Italy ID CO-AUTHORSHIP; INTERNATIONAL COLLABORATION; SOCIAL-SCIENCES; NETWORKS; EUROPE; DETERMINANTS; COAUTHORSHIP; REFERENCES; CITATIONS; PATTERNS AB The analysis of research collaboration by field is traditionally conducted beginning with the classification of the publications from the context of interest. In this work we propose an alternative approach based on the classification of the authors by field. 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Informetr. PY 2013 VL 7 IS 2 BP 442 EP 454 DI 10.1016/j.joi.2013.01.009 PG 13 WC Information Science & Library Science SC Information Science & Library Science GA 136PY UT WOS:000318377100022 ER PT J AU Fu, HZ Ho, YS AF Fu, Hui-Zhen Ho, Yuh-Shan TI Independent research of China in Science Citation Index Expanded during 1980-2011 SO JOURNAL OF INFORMETRICS LA English DT Article DE Bibliometric; Web of Science; Y-index; Top cited articles; Country ID FREQUENTLY CITED ARTICLES; BIBLIOMETRIC ANALYSIS; SCIENTIFIC COLLABORATION; SCIENTOMETRIC ANALYSIS; CARBON NANOTUBES; JOURNALS; CLASSICS; AUTHORSHIP; NANOTECHNOLOGY; NANOSCIENCE AB The study explores the characteristics of China's independent research articles published from 1980 to 2011, based on the database of Science Citation Index Expanded. The publication outputs of seven major industrialized countries including Canada, France, Japan, Germany, Italy, the UK, and the USA were compared with China. Annual production, field performance, research emphases and trends, top articles, as well as main institutional and individual contributors by its top cited articles were analyzed. Some newly developed indicators related to words in title, author keywords, KeyWords Plus, first author, corresponding author, and Y-index were employed to provide in-depth information on topic and author contributions. Results showed that China has been closing the gap with the USA with the greatest growth, and has stood the second since 2006. Most top cited articles were published in 2000s, made up approximately seven tenths of total articles. Pronounced activities were found in chemistry and physics related categories. The core categories included multidisciplinary chemistry, physical chemistry, multidisciplinary materials science, and applied physics. 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The results based on data collected from the DVD version of the 2011 SCI database identify the U.S. as the most central country, followed by the U.K., Germany, France, Italy, Australia, the Netherlands, Canada, and Spain, in that order. However, some countries (e.g., Portugal) with low degree centrality occupied relatively central positions in terms of betweenness centrality. The results of the semantic network analysis suggest that internationally co-authored papers tend to focus on primary technologies, particularly in terms of programming and related database issues. The results show that a combination of words and locations can provide a richer representation of an emerging field of science than the sum of the two separate representations. (C) 2013 Elsevier Ltd. All rights reserved. C1 [Park, Han Woo] YeungNam Univ, Dept Media & Commun, Gyongsan 712749, Gyeongsangbuk D, South Korea. 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TI Mapping citation patterns of book chapters in the Book Citation Index SO JOURNAL OF INFORMETRICS LA English DT Article DE Information gain; Book Citation Index; Databases; Academic publishers; Citation analysis; Book chapters; Lotkaian distribution ID GOOGLE SCHOLAR; SOCIAL-SCIENCES; HUMANITIES; SCOPUS; MONOGRAPHS; PUBLISHERS; RANKINGS; IMPACT; WEB AB In this paper we provide the reader with a visual representation of relationships among the impact of book chapters indexed in the Book Citation Index using information gain values and published by different academic publishers in specific disciplines. The impact of book chapters can be characterized statistically by citations histograms. For instance, we can compute the probability of occurrence of book chapters with a number of citations in different intervals for each academic publisher. We predict the similarity between two citation histograms based on the amount of relative information between such characterizations. 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Informetr. PY 2013 VL 7 IS 2 BP 249 EP 264 DI 10.1016/j.joi.2012.11.008 PG 16 WC Information Science & Library Science SC Information Science & Library Science GA 136PY UT WOS:000318377100001 ER PT J AU Abramo, G Cicero, T D'Angelo, CA AF Abramo, Giovanni Cicero, Tindaro D'Angelo, Ciriaco Andrea TI How important is choice of the scaling factor in standardizing citations? SO JOURNAL OF INFORMETRICS LA English DT Article DE Research evaluation; Bibliometrics; Citations; Scaling; Sensitivity analysis; Productivity; Researchers ID RESEARCH PERFORMANCE; DISTRIBUTIONS; UNIVERSALITY; INDICATORS; SCIENCE; IMPACT; MODEL AB Because of the variations in citation behavior across research fields, appropriate standardization must be applied as part of any bibliometric analysis of the productivity of individual scientists and research organizations. Such standardization involves scaling by some factor that characterizes the distribution of the citations of articles from the same year and subject category. In this work we conduct an analysis of the sensitivity of researchers' productivity rankings to the scaling factor chosen to standardize their citations. To do this we first prepare the productivity rankings for all researchers (more than 30,000) operating in the hard sciences in Italy, over the period 2004-2008. We then measure the shifts in rankings caused by adopting scaling factors other than the particular factor that seems more effective for comparing the impact of publications in different fields: the citation average of the distribution of cited-only publications. (C) 2012 Elsevier Ltd. All rights reserved. C1 [Abramo, Giovanni] Natl Res Council Italy, Inst Syst Anal & Comp Sci IASI CNR, Rome, Italy. [Abramo, Giovanni; Cicero, Tindaro; D'Angelo, Ciriaco Andrea] Univ Roma Tor Vergata, Sch Engn, Dept Management, Lab Studies Res & Technol Transfer, Rome, Italy. RP Abramo, G (reprint author), Univ Roma Tor Vergata, Dipartimento Ingn Impresa, Via Politecn 1, I-00133 Rome, Italy. EM giovanni.abramo@uniroma2.it RI D'Angelo, Ciriaco Andrea/J-8162-2012 CR Abramo G, 2012, J INFORMETR, V6, P470, DOI 10.1016/j.joi.2012.03.005 Abramo G, 2011, SCIENTOMETRICS, V88, P915, DOI 10.1007/s11192-011-0426-6 Abramo G, 2007, CURR SCI INDIA, V93, P762 Abramo G, 2011, SCIENTOMETRICS, V86, P347, DOI 10.1007/s11192-010-0297-2 Albarran P., 2011, EC WORKING PAPERS U Bornmann L., 2010, J INFORMETR, V5, P228 Radicchi F, 2012, PLOS ONE, V7, DOI 10.1371/journal.pone.0033833 D'Angelo CA, 2011, J AM SOC INF SCI TEC, V62, P257, DOI 10.1002/asi.21460 Gupta HM, 2005, BRAZ J PHYS, V35, P981, DOI 10.1590/S0103-97332005000600012 HURT CD, 1987, INFORM PROCESS MANAG, V23, P1, DOI 10.1016/0306-4573(87)90033-1 Leydesdorf, 2011, 2011 ATL C SCI TECHN Leydesdorff L, 2011, J AM SOC INF SCI TEC, V62, P1370, DOI 10.1002/asi.21534 Lundberg J, 2007, J INFORMETR, V1, P145, DOI 10.1016/j.joi.2006.09.007 Moed HF, 2004, HDB QUANTITATIVE SCI MOED HF, 1995, SCIENTOMETRICS, V33, P381, DOI 10.1007/BF02017338 PETERS HPF, 1994, J AM SOC INFORM SCI, V45, P39, DOI 10.1002/(SICI)1097-4571(199401)45:1<39::AID-ASI5>3.0.CO;2-Q Peterson GJ, 2010, P NATL ACAD SCI USA, V107, P16023, DOI 10.1073/pnas.1010757107 Radicchi F, 2011, PHYS REV E, V83, DOI 10.1103/PhysRevE.83.046116 Radicchi F, 2008, P NATL ACAD SCI USA, V105, P17268, DOI 10.1073/pnas.0806977105 Redner, 1998, EUROPEAN PHYS J B, V4, P131 Rehn C., 2007, BIBLIOMETRIC INDICAT Stringer MJ, 2010, J AM SOC INF SCI TEC, V61, P1377, DOI 10.1002/asi.21335 Thompson B., 1993, ANN M MIDS ED RES AS Vieira ES, 2010, J INFORMETR, V4, P1, DOI 10.1016/j.joi.2009.06.002 Vinkler P, 1996, SCIENTOMETRICS, V36, P223, DOI 10.1007/BF02017315 Waltman L, 2012, J AM SOC INF SCI TEC, V63, P72, DOI 10.1002/asi.21671 NR 26 TC 5 Z9 5 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 1751-1577 J9 J INFORMETR JI J. Informetr. PD OCT PY 2012 VL 6 IS 4 BP 645 EP 654 DI 10.1016/j.joi.2012.07.002 PG 10 WC Information Science & Library Science SC Information Science & Library Science GA 003AY UT WOS:000308581700023 ER PT J AU Baccini, A Barabesi, L Marcheselli, M Pratelli, L AF Baccini, A. Barabesi, L. Marcheselli, M. Pratelli, L. TI Statistical inference on the h-index with an application to top-scientist performance SO JOURNAL OF INFORMETRICS LA English DT Article DE h-index; Point and set estimation; Simultaneous pairwise confidence sets ID HIRSCH-INDEX; ASYMPTOTICS; INDICATORS; FAMILY; MODEL AB Despite the huge amount of literature concerning the h-index, few papers have been devoted to its statistical analysis when a probabilistic distribution is assumed for citation counts. The present contribution mainly aims to divulge the inferential techniques recently introduced by Pratelli et al. (2012), by explaining the details for proper point and set estimation of the theoretical h-index. Moreover, some new achievements on simultaneous inference - addressed to produce suitable scholar comparisons - are carried out. Finally, the analysis of the citation dataset for the Nobel Laureates (in the last five years) and for the Fields medallists (from 2002 onward) is considered in order to exemplify the theoretical issues. (C) 2012 Elsevier Ltd. All rights reserved. C1 [Baccini, A.; Barabesi, L.; Marcheselli, M.] Univ Siena, Dept Econ & Stat, I-53100 Siena, Italy. [Pratelli, L.] Naval Acad, I-57100 Livorno, Italy. RP Baccini, A (reprint author), Univ Siena, Dept Econ & Stat, Pzza S Francesco 7, I-53100 Siena, Italy. EM alberto.baccini@unisi.it CR Alonso S, 2009, J INFORMETR, V3, P273, DOI 10.1016/j.joi.2009.04.001 Ball P, 2005, NATURE, V436, P900, DOI 10.1038/436900a Barcza K, 2009, SCIENTOMETRICS, V81, P513, DOI 10.1007/s11192-008-2175-8 Beirlant J, 2010, SCAND J STAT, V37, P355, DOI 10.1111/j.1467-9469.2010.00694.x Costas R, 2007, J INFORMETR, V1, P193, DOI 10.1016/j.joi.2007.02.001 Drton M, 2004, BIOMETRIKA, V91, P591, DOI 10.1093/biomet/91.3.591 Egghe L, 2010, ANNU REV INFORM SCI, V44, P65 Egghe L, 2006, SCIENTOMETRICS, V69, P131, DOI 10.1007/s11192-006-0144-7 Egghe L, 2005, LIBR INFORM SCI SER, P1 Egghe L, 2006, SCIENTOMETRICS, V69, P121, DOI 10.1007/s11192-006-0143-8 Glanzel W, 2010, J INFORMETR, V4, P313, DOI 10.1016/j.joi.2010.01.005 Hirsch JE, 2005, P NATL ACAD SCI USA, V102, P16569, DOI 10.1073/pnas.0507655102 Mandel M, 2008, COMPUT STAT DATA AN, V52, P2158, DOI 10.1016/j.csda.2007.07.005 Marcheselli M, 2008, COMMUN STAT-THEOR M, V37, P815, DOI 10.1080/03610920701570298 Panaretos J, 2009, SCIENTOMETRICS, V81, P635, DOI 10.1007/s11192-008-2174-9 Pratelli L., SCANDINAVIA IN PRESS Rousseau R, 2008, P WIS 2008 4 INT C W SIDAK Z, 1967, J AM STAT ASSOC, V62, P626, DOI 10.2307/2283989 Xiong SF, 2011, J MULTIVARIATE ANAL, V102, P336, DOI 10.1016/j.jmva.2010.09.008 Ye FY, 2011, J AM SOC INF SCI TEC, V62, P205, DOI 10.1002/asi.21456 Zhu R, 2009, STAT PROBABIL LETT, V79, P1695, DOI 10.1016/j.spl.2009.04.011 NR 21 TC 5 Z9 5 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 1751-1577 J9 J INFORMETR JI J. Informetr. PD OCT PY 2012 VL 6 IS 4 BP 721 EP 728 DI 10.1016/j.joi.2012.07.009 PG 8 WC Information Science & Library Science SC Information Science & Library Science GA 003AY UT WOS:000308581700031 ER PT J AU Fiala, D AF Fiala, Dalibor TI Time-aware PageRank for bibliographic networks SO JOURNAL OF INFORMETRICS LA English DT Article DE PageRank; Citations; Collaboration; Time; Salient researchers; Computer science AB In the past, recursive algorithms, such as PageRank originally conceived for the Web, have been successfully used to rank nodes in the citation networks of papers, authors, or journals. They have proved to determine prestige and not popularity, unlike citation counts. However, bibliographic networks, in contrast to the Web, have some specific features that enable the assigning of different weights to citations, thus adding more information to the process of finding prominence. For example, a citation between two authors may be weighed according to whether and when those two authors collaborated with each other, which is information that can be found in the co-authorship network. In this study, we define a couple of PageRank modifications that weigh citations between authors differently based on the information from the co-authorship graph. In addition, we put emphasis on the time of publications and citations. We test our algorithms on the Web of Science data of computer science journal articles and determine the most prominent computer scientists in the 10-year period of 1996-2005. Besides a correlation analysis, we also compare our rankings to the lists of ACM A. M. Turing Award and ACM SIGMOD E. F. Codd Innovations Award winners and find the new time-aware methods to outperform standard PageRank and its time-unaware weighted variants. (C) 2012 Elsevier Ltd. All rights reserved. C1 Univ W Bohemia, Plzen 30614, Czech Republic. RP Fiala, D (reprint author), Univ W Bohemia, Univ 8, Plzen 30614, Czech Republic. EM dalfia@kiv.zcu.cz RI Fiala, Dalibor/C-8690-2012 OI Fiala, Dalibor/0000-0002-2528-771X CR Bar-Ilan J, 2010, SCIENTOMETRICS, V83, P809, DOI 10.1007/s11192-009-0145-4 Bergstrom C., 2007, COLL RES LIB NEWS, V68, P314 Bollen J, 2006, SCIENTOMETRICS, V69, P669, DOI 10.1007/s11192-006-0176-z Brin S., 1998, P 7 INT WORLD WID WE, P107 Chen P, 2007, J INFORMETR, V1, P8, DOI 10.1016/j.joi.2006.06.001 Ding Y, 2009, J AM SOC INF SCI TEC, V60, P2229, DOI 10.1002/asi.21171 Ding Y, 2011, J AM SOC INF SCI TEC, V62, P236, DOI 10.1002/asi.21452 Fiala D, 2012, INFORM PROCESS MANAG, V48, P242, DOI 10.1016/j.ipm.2011.10.001 Fiala D, 2011, SCIENTOMETRICS, V86, P553, DOI 10.1007/s11192-010-0326-1 Fiala D, 2008, SCIENTOMETRICS, V76, P135, DOI 10.1007/s11192-007-1908-4 Franceschet M., 2010, COMMUN ACM, V53, P129, DOI 10.1145/1859204.1859234 Gonzalez-Pereira B, 2010, J INFORMETR, V4, P379, DOI 10.1016/j.joi.2010.03.002 Kleinberg JM, 1999, J ACM, V46, P604, DOI 10.1145/324133.324140 Ma N, 2008, INFORM PROCESS MANAG, V44, P800, DOI 10.1016/j.ipm.2007.06.006 Sidiropoulos A, 2005, SIGMOD RECORD, V34, P54, DOI 10.1145/1107499.1107506 Wainer J, 2011, COMMUN ACM, V54, P141, DOI 10.1145/1941487.1941517 Walker D., 2007, J STAT MECH THEORY E, V6 Xing W., 2004, Proceedings. Second Annual Conference on Communication Networks and Services Research, DOI 10.1109/DNSR.2004.1344743 Yan E, 2010, J AM SOC INF SCI TEC, V61, P1635, DOI 10.1002/asi.21349 Yan EJ, 2011, INFORM PROCESS MANAG, V47, P125, DOI 10.1016/j.ipm.2010.05.002 Yu P. S., 2004, P 13 WORLD WID WEB C, P1180 NR 21 TC 5 Z9 5 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 1751-1577 J9 J INFORMETR JI J. Informetr. PD JUL PY 2012 VL 6 IS 3 BP 370 EP 388 DI 10.1016/j.joi.2012.02.002 PG 19 WC Information Science & Library Science SC Information Science & Library Science GA 937LN UT WOS:000303660100004 ER PT J AU Abramo, G Cicero, T D'Angelo, CA AF Abramo, Giovanni Cicero, Tindaro D'Angelo, Ciriaco Andrea TI A sensitivity analysis of researchers' productivity rankings to the time of citation observation SO JOURNAL OF INFORMETRICS LA English DT Article DE Research evaluation; Bibliometrics; Citation window; Individual productivity; Sensitivity analysis ID BIBLIOMETRIC INDICATORS; RESEARCH PERFORMANCE; UNIVERSITY AB In this work we investigate the sensitivity of individual researchers' productivity rankings to the time of citation observation. The analysis is based on observation of research products for the 2001-2003 triennium for all research staff of Italian universities in the hard sciences, with the year of citation observation varying from 2004 to 2008. The 2008 rankings list is assumed the most accurate, as citations have had the longest time to accumulate and thus represent the best possible proxy of impact. By comparing the rankings lists from each year against the 2008 benchmark we provide policy-makers and research organization managers a measure of trade-off between timeliness of evaluation execution and accuracy of performance rankings. The results show that with variation in the evaluation citation window there are variable rates of inaccuracy across the disciplines of researchers. The inaccuracy results negligible for Physics, Biology and Medicine. (C) 2011 Elsevier Ltd. All rights reserved. C1 [Abramo, Giovanni; Cicero, Tindaro; D'Angelo, Ciriaco Andrea] Univ Roma Tor Vergata, Dept Management, Sch Engn, Lab Studies Res & Technol Transfer, Rome, Italy. [Abramo, Giovanni] CNR, IASI, Inst Syst Anal & Comp Sci, I-00185 Rome, Italy. RP Abramo, G (reprint author), Univ Roma Tor Vergata, Dipartimento Ingn Impresa, Via Politecn 1, I-00133 Rome, Italy. EM giovanni.abramo@uniroma2.it RI D'Angelo, Ciriaco Andrea/J-8162-2012 CR Abramo G, 2011, SCIENTOMETRICS, V86, P347, DOI 10.1007/s11192-010-0297-2 Abramo G, 2011, J INFORMETR, V5, P659, DOI 10.1016/j.joi.2011.06.004 Abramo G, 2011, J INFORMETR, V5, P618, DOI 10.1016/j.joi.2011.06.001 Abramo G, 2011, SCIENTOMETRICS, V87, P499, DOI 10.1007/s11192-011-0352-7 Abramo G., 2011, SENSITIVITY ANAL RES Abramo G, 2009, RES POLICY, V38, P206, DOI 10.1016/j.respol.2008.11.001 Aksnes DW, 2004, RES EVALUAT, V13, P33, DOI 10.3152/147154404781776563 Burrell QL, 2001, SCIENTOMETRICS, V52, P3, DOI 10.1023/A:1012751509975 Burrell QL, 2002, SCIENTOMETRICS, V55, P273, DOI 10.1023/A:1019671808921 D'Angelo CA, 2011, J AM SOC INF SCI TEC, V62, P257, DOI 10.1002/asi.21460 Franceschet M, 2011, J INFORMETR, V5, P275, DOI 10.1016/j.joi.2010.12.002 Glanzel W, 2004, SCIENTOMETRICS, V60, P511, DOI 10.1023/B:SCIE.0000034391.06240.2a HORROBIN DF, 1990, JAMA-J AM MED ASSOC, V263, P1438, DOI 10.1001/jama.263.10.1438 Lundberg J, 2007, J INFORMETR, V1, P145, DOI 10.1016/j.joi.2006.09.007 MacRoberts MH, 1996, SCIENTOMETRICS, V36, P435, DOI 10.1007/BF02129604 MOED HF, 1985, RES POLICY, V14, P131, DOI 10.1016/0048-7333(85)90012-5 Moed HF, 2002, NATURE, V415, P731 Moxham H., 1992, SCI TECHNOLOGY POLIC, V5, P7 Oppenheim C., 2003, J DOC, V56, P709 Oppenheim C, 1997, J DOC, V53, P477, DOI 10.1108/EUM0000000007207 Pendlebury DA, 2009, ARCH IMMUNOL THER EX, V57, P1, DOI 10.1007/s00005-009-0008-y Rehn C., 2007, BIBLIOMETRIC INDICAT Rinia EJ, 1998, RES POLICY, V27, P95, DOI 10.1016/S0048-7333(98)00026-2 Van Raan AFJ, 2005, SCIENTOMETRICS, V62, P133, DOI 10.1007/s11192-005-0008-6 NR 24 TC 5 Z9 5 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 1751-1577 J9 J INFORMETR JI J. Informetr. PD APR PY 2012 VL 6 IS 2 BP 192 EP 201 DI 10.1016/j.joi.2011.12.003 PG 10 WC Information Science & Library Science SC Information Science & Library Science GA 906RF UT WOS:000301364100004 ER PT J AU Bornmann, L Marx, W AF Bornmann, Lutz Marx, Werner TI HistCite analysis of papers constituting the h index research front SO JOURNAL OF INFORMETRICS LA English DT Article DE h index; Research front; HistCite ID SCIENTIFIC-RESEARCH OUTPUT; HIRSCH-TYPE INDEXES; BIBLIOMETRIC INDICATORS; IMPACT; JOURNALS; RANKING; SCIENCE AB In the Essential Science Indicators (Thomson Reuters), a research front exists to the h index (entitled "GOOGLE SCHOLAR H-INDEX; SCIENCE CITATION INDEX; GENERALIZED HIRSCH H-INDEX; H INDEX; GOOGLE SCHOLAR CITATIONS") consisting of a group of highly cited papers. We used HistCite to analyze the structure and relationships of the 45 papers forming the h index research front. Since we were interested in the topics of research on the h index at the front, we classified each paper according to its main topic. Six topics (inductively generated) were sufficient to classify the 45 papers: (1) citation database, (2) empirical validation study, (3) new application, (4) theoretical analysis, (5) new index development, and (6) literature review. (C) 2011 Elsevier Ltd. All rights reserved. C1 [Bornmann, Lutz] Max Planck Soc, D-80539 Munich, Germany. [Marx, Werner] Max Planck Inst Solid State Res, D-70569 Stuttgart, Germany. RP Bornmann, L (reprint author), Max Planck Soc, Hofgartenstr 8, D-80539 Munich, Germany. EM bornmann@gv.mpg.de RI Marx, Werner/G-6801-2012; Bornmann, Lutz/A-3926-2008 OI Marx, Werner/0000-0002-1763-5753; Bornmann, Lutz/0000-0003-0810-7091 CR Alonso S, 2009, J INFORMETR, V3, P273, DOI 10.1016/j.joi.2009.04.001 Aris A, 2009, J AM SOC INF SCI TEC, V60, P2219, DOI 10.1002/asi.21160 Banks MG, 2006, SCIENTOMETRICS, V69, P161, DOI 10.1007/s11192-006-0146-5 Bornmann L, 2011, J INFORMETR, V5, P346, DOI 10.1016/j.joi.2011.01.006 Bornmann L, 2005, SCIENTOMETRICS, V65, P391, DOI 10.1007/s11192-005-0281-4 Bornmann L, 2009, EMBO REP, V10, P2, DOI 10.1038/embor.2008.233 Bornmann L, 2007, J AM SOC INF SCI TEC, V58, P1381, DOI 10.1002/asi.20609 Braun T, 2006, SCIENTOMETRICS, V69, P169, DOI 10.1007/s11192-006-0147-4 Costas R, 2007, J INFORMETR, V1, P193, DOI 10.1016/j.joi.2007.02.001 Egghe L, 2010, ANNU REV INFORM SCI, V44, P65 Egghe L, 2006, SCIENTOMETRICS, V69, P131, DOI 10.1007/s11192-006-0144-7 Egghe L, 2006, SCIENTOMETRICS, V69, P121, DOI 10.1007/s11192-006-0143-8 Franceschini F, 2010, EUR J OPER RES, V203, P494, DOI 10.1016/j.ejor.2009.08.001 GARFIELD E, 1972, SCIENCE, V178, P471, DOI 10.1126/science.178.4060.471 Garfield E, 2009, J INFORMETR, V3, P173, DOI 10.1016/j.joi.2009.03.009 Garfield E, 2004, J INF SCI, V30, P119, DOI 10.1177/0165551504042802 Glanzel W, 2006, SCIENTOMETRICS, V67, P315, DOI 10.1556/Scient.67.2006.2.12 Hirsch JE, 2007, P NATL ACAD SCI USA, V104, P19193, DOI 10.1073/pnas.0707962104 Hirsch JE, 2005, P NATL ACAD SCI USA, V102, P16569, DOI 10.1073/pnas.0507655102 Jacso P, 2005, CURR SCI INDIA, V89, P1537 Jin BH, 2007, CHINESE SCI BULL, V52, P855, DOI 10.1007/s11434-007-0145-9 Kosmulski M., 2006, FORUM AKAD, P31 Liu YX, 2009, SCIENTOMETRICS, V79, P235, DOI 10.1007/s11192-009-0415-1 Mingers J, 2009, J OPER RES SOC, V60, P1143, DOI 10.1057/jors.2008.94 Nahata Milap C, 2009, AM J PHARM ED, V73 Norris M, 2010, J DOC, V66, P681, DOI 10.1108/00220411011066790 Panaretos J, 2009, SCIENTOMETRICS, V81, P635, DOI 10.1007/s11192-008-2174-9 Prathap G, 2006, CURR SCI INDIA, V91, P1439 Schreiber M, 2008, SCIENTOMETRICS, V76, P187, DOI 10.1007/s11192-007-1886-6 Schubert A, 2007, SCIENTOMETRICS, V70, P201, DOI 10.1007/s11192-007-0112-x Thomson Reuters, 2008, US BIBL GUID EV RES Vanclay JK, 2007, J AM SOC INF SCI TEC, V58, P1547, DOI 10.1002/asi.20616 Van Raan AFJ, 2006, SCIENTOMETRICS, V67, P491, DOI 10.1556/Scient.67.2006.3.10 Zhang L, 2011, J INFORMETR, V5, P583, DOI 10.1016/j.joi.2011.05.004 NR 34 TC 5 Z9 5 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 1751-1577 J9 J INFORMETR JI J. Informetr. PD APR PY 2012 VL 6 IS 2 BP 285 EP 288 DI 10.1016/j.joi.2011.11.001 PG 4 WC Information Science & Library Science SC Information Science & Library Science GA 906RF UT WOS:000301364100012 ER PT J AU Nicolaisen, J Frandsen, TF AF Nicolaisen, Jeppe Frandsen, Tove Faber TI Consensus formation in science modeled by aggregated bibliographic coupling SO JOURNAL OF INFORMETRICS LA English DT Article DE Bibliographic coupling; Consensus formation ID JOURNAL REJECTION RATES; SCIENTIFIC CONSENSUS; HIERARCHY; GRAPHS AB The level of consensus in science has traditionally been measured by a number of different methods. The variety is important as each method measures different aspects of science and consensus. Citation analytical studies have previously measured the level of consensus using the scientific journal as their unit of analysis. To produce a more fine grained citation analysis one needs to study consensus formation on an even more detailed level - i.e. the scientific document or article. To do so, we have developed a new technique that measures consensus by aggregated bibliographic couplings (ABC) between documents. The advantages of the ABC-technique are demonstrated in a study of two selected disciplines in which the levels of consensus are measured using the proposed technique. (C) 2011 Elsevier Ltd. All rights reserved. C1 [Frandsen, Tove Faber] Univ So Denmark, DK-5230 Odense M, Denmark. [Nicolaisen, Jeppe] Royal Sch Lib & Informat Sci, DK-2300 Copenhagen S, Denmark. RP Frandsen, TF (reprint author), Univ So Denmark, Campusvej 55, DK-5230 Odense M, Denmark. EM jni@iva.dk; tofr@litcul.sdu.dk RI Frandsen, Tove/A-6185-2012 OI Frandsen, Tove/0000-0002-8983-5009 CR Ahlgren P, 2008, SCIENTOMETRICS, V76, P273, DOI 10.1007/s11192-007-1935-1 Burrell QL, 2008, INFORM PROCESS MANAG, V44, P1794, DOI 10.1016/j.ipm.2008.03.002 Ceapraz I. L., 2008, ROMANIAN J REGIONAL, V2, P68 Chiang IP, 2009, J AM SOC INF SCI TEC, V60, P1349, DOI 10.1002/asi.21058 CLEVELAND WS, 1984, AM STAT, V38, P261, DOI 10.2307/2683400 Cole S., 1978, METRIC SCI, P209 COLE S, 1983, AM J SOCIOL, V89, P111, DOI 10.1086/227835 Cole S, 1992, MAKING SCI NATURE SO COLE S, 1988, AM SOCIOL REV, V53, P152, DOI 10.2307/2095740 Damgaard C., 2010, MATHWORLD WOLFRAM WE De Bellis N., 2009, BIBLIOMETRICS CITATI Egghe L., 1990, INTRO INFORMETRICS Q Foldvary F. 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S, 1970, COMMUNICATION SCI EN, P3 Shwed U, 2010, AM SOCIOL REV, V75, P817, DOI 10.1177/0003122410388488 Smith LD, 2000, SOC STUD SCI, V30, P73, DOI 10.1177/030631200030001003 Smithson M. J., 2003, QUANTITATIVE APPL SO, V140 Tang R, 2008, COLL RES LIBR, V69, P356 NR 31 TC 5 Z9 5 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 1751-1577 J9 J INFORMETR JI J. Informetr. PD APR PY 2012 VL 6 IS 2 BP 276 EP 284 DI 10.1016/j.joi.2011.08.001 PG 9 WC Information Science & Library Science SC Information Science & Library Science GA 906RF UT WOS:000301364100011 ER PT J AU Rousseau, R Liu, YX Ye, FY AF Rousseau, Ronald Liu, Yuxian Ye, Fred Y. TI A preliminary investigation on diffusion through a layered system SO JOURNAL OF INFORMETRICS LA English DT Article DE Diffusion; Layered systems; Gini evenness index; Counting methods ID JOURNAL DIFFUSION; PUBLICATIONS AB We introduce layered systems such as the citations-citing authors-citing institutes-citing countries one. Diffusion of scientific ideas flows through such layered systems. Our contribution contains three main topics: a fractional counting system for the number of different units in a layer; the fractional number of items of the same type, i.e. in the same layer, over which ideas have been diffused; and the evenness of diffusion over different layers. In this way we construct a coherent system to measure the extent to which scientific ideas are diffused. (C) 2012 Elsevier Ltd. All rights reserved. C1 [Ye, Fred Y.] Zhejiang Univ, Dept Informat Resource Management, Hangzhou 310027, Peoples R China. [Rousseau, Ronald] KHBO, Assoc KU Leuven, Fac Engn Technol, B-8400 Oostende, Belgium. [Rousseau, Ronald] Katholieke Univ Leuven, Dept Math, B-3001 Heverlee, Belgium. [Rousseau, Ronald] Univ Antwerp, IOIW, B-2000 Antwerp, Belgium. [Liu, Yuxian] Tongji Univ, Lib Tongji Univ, Shanghai 200092, Peoples R China. RP Ye, FY (reprint author), Zhejiang Univ, Dept Informat Resource Management, Hangzhou 310027, Peoples R China. EM ronald.rousseau@khbo.be; yxliu@lib.tongji.edu.cn; yye@zju.edu.cn CR Ajiferuke I., 2009, P 12 INT C INT SOC S, P798 Franceschini F, 2010, SCIENTOMETRICS, V85, P203, DOI 10.1007/s11192-010-0165-0 Frandsen TF, 2006, J DOC, V62, P58, DOI 10.1108/00220410610642048 Frandsen TF, 2004, ASLIB PROC, V56, P5, DOI 10.1108/00012530410516822 Hu XJ, 2009, J AM SOC INF SCI TEC, V60, P2378, DOI 10.1002/asi.21164 LECOADIC YF, 1987, J INFORM SCI, V13, P143, DOI 10.1177/016555158701300304 Leydesdorff L, 2011, J AM SOC INF SCI TEC, V62, P846, DOI 10.1002/asi.21509 Liu Y., 2011, THESIS ANTWERP U Liu YX, 2012, J DOC, V68, P31, DOI 10.1108/00220411211200310 Liu YX, 2010, J AM SOC INF SCI TEC, V61, P340, DOI 10.1002/asi.21248 Nijssen David, 1998, Coenoses, V13, P33 Peri G, 2005, REV ECON STAT, V87, P308, DOI 10.1162/0034653053970258 Rafols I, 2010, SCIENTOMETRICS, V82, P263, DOI 10.1007/s11192-009-0041-y Rons N, 2009, RES EVALUAT, V18, P233, DOI 10.3152/095820209X470563 Rowlands I, 2002, ASLIB PROC, V54, P77, DOI 10.1108/00012530210435211 NR 15 TC 5 Z9 5 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 1751-1577 J9 J INFORMETR JI J. Informetr. PD APR PY 2012 VL 6 IS 2 BP 177 EP 191 DI 10.1016/j.joi.2012.01.005 PG 15 WC Information Science & Library Science SC Information Science & Library Science GA 906RF UT WOS:000301364100003 ER PT J AU Rons, N AF Rons, Nadine TI Partition-based Field Normalization: An approach to highly specialized publication records SO JOURNAL OF INFORMETRICS LA English DT Article DE Bibliometric indicators; Individual research performance; Field normalization; Field partition; Partition-based Field Normalization ID BIBLIOMETRIC INDICATORS; STATISTICAL PROPERTIES; CROSS-FIELD; PERFORMANCE AB Field normalized citation rates are well-established indicators for research performance from the broadest aggregation levels such as countries, down to institutes and research teams. When applied to still more specialized publication sets at the level of individual scientists, also a more accurate delimitation is required of the reference domain that provides the expectations to which a performance is compared. This necessity for sharper accuracy challenges standard methodology based on pre-defined subject categories. This paper proposes a way to define a reference domain that is more strongly delimited than in standard methodology, by building it up out of cells of the partition created by the pre-defined subject categories and their intersections. This partition approach can be applied to different existing field normalization variants. The resulting reference domain lies between those generated by standard field normalization and journal normalization. Examples based on fictive and real publication records illustrate how the potential impact on results can exceed or be smaller than the effect of other currently debated normalization variants, depending on the case studied. The proposed Partition-based Field Normalization is expected to offer advantages in particular at the level of individual scientists and other very specific publication records, such as publication output from interdisciplinary research. (C) 2011 Elsevier Ltd. All rights reserved. C1 [Rons, Nadine] VUB, Res Coordinat Unit, B-1050 Brussels, Belgium. [Rons, Nadine] VUB, Ctr R&D Monitoring ECOOM, B-1050 Brussels, Belgium. RP Rons, N (reprint author), VUB, Res Coordinat Unit, Pl Laan 2, B-1050 Brussels, Belgium. EM Nadine.Rons@vub.ac.be RI Rons, Nadine/B-9699-2008 OI Rons, Nadine/0000-0002-0548-4927 CR Aksnes DW, 2004, RES EVALUAT, V13, P33, DOI 10.3152/147154404781776563 Bornmann L., 2008, ETHICS SCI ENV POLIT, V8, P93, DOI DOI 10.3354/ESEP00084 Bornmann L, 2010, J INFORMETR, V4, P441, DOI 10.1016/j.joi.2010.04.004 Boyack KW, 2005, SCIENTOMETRICS, V64, P351, DOI 10.1007/s11192-005-0255-6 BRAUN T, 1990, SCIENTOMETRICS, V19, P513, DOI 10.1007/BF02020712 Hirsch JE, 2005, P NATL ACAD SCI USA, V102, P16569, DOI 10.1073/pnas.0507655102 Leydesdorff L, 2010, J INFORMETR, V4, P644, DOI 10.1016/j.joi.2010.05.003 Lundberg J, 2007, J INFORMETR, V1, P145, DOI 10.1016/j.joi.2006.09.007 MOED HF, 1995, SCIENTOMETRICS, V33, P381, DOI 10.1007/BF02017338 Opthof T, 2010, J INFORMETR, V4, P423, DOI 10.1016/j.joi.2010.02.003 Rons N., 2006, NEW FRONTIERS EVALUA Rons N, 2009, RES EVALUAT, V18, P233, DOI 10.3152/095820209X470563 Schubert A, 1996, SCIENTOMETRICS, V36, P311, DOI 10.1007/BF02129597 van Raan AFJ, 2006, J AM SOC INF SCI TEC, V57, P408, DOI 10.1002/asi.20284 van Raan AFJ, 2006, J AM SOC INF SCI TEC, V57, P1919, DOI 10.1002/asi.20389 van Raan AFJ, 2010, J INFORMETR, V4, P431, DOI 10.1016/j.joi.2010.03.008 Waltman L, 2011, SCIENTOMETRICS, V87, P467, DOI 10.1007/s11192-011-0354-5 Waltman L, 2011, J INFORMETR, V5, P37, DOI 10.1016/j.joi.2010.08.001 Zitt M, 2008, J AM SOC INF SCI TEC, V59, P1856, DOI 10.1002/asi.20880 Zitt M, 2005, SCIENTOMETRICS, V63, P373, DOI 10.1007/s11192-005-0218-y NR 20 TC 5 Z9 5 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 1751-1577 J9 J INFORMETR JI J. Informetr. PD JAN PY 2012 VL 6 IS 1 BP 1 EP 10 DI 10.1016/j.joi.2011.09.008 PG 10 WC Information Science & Library Science SC Information Science & Library Science GA 865QL UT WOS:000298325300001 ER PT J AU Buter, RK van Raan, AFJ AF Buter, R. K. van Raan, A. F. J. TI Non-alphanumeric characters in titles of scientific publications: An analysis of their occurrence and correlation with citation impact SO JOURNAL OF INFORMETRICS LA English DT Article DE Impact; Occurrence; Special characters; Scientific publications; Titles; Bootstrap; Heatmaps ID CONFIDENCE-INTERVALS; BOOTSTRAP; ARTICLES; ASTERISK; COLONS AB We investigated the occurrence of non-alphanumeric characters in a randomized subset of over almost 650,000 titles of scientific publications from the Web of Science database. Additionally, for almost 500,000 of these publications we correlated occurrence with impact, using the field-normalised citation metric CPP/FCSm. We compared occurrence and correlation with impact both at in general and for specific disciplines and took into account the variation within sets by (non-parametrically) bootstrapping the calculation of impact values. We also compared use and impact of individual characters in the 30 fields in which non-alphanumeric characters occur most frequently, by using heatmaps that clustered and reordered fields and characters. We conclude that the use of some non-alphanumeric characters, such as the hyphen and colon, is common in most titles and that not including such characters generally correlates negatively with impact. Specific disciplines on the other hand, may show either a negative, absent, or positive correlation. We also found that thematically related science fields use non-alphanumeric characters in comparable numbers, but that impact associated with such characters shows a less strong thematic relation. Overall, it appears that authors cannot influence success of publications by including non-alphanumeric characters in fields where this is not already commonplace. (C) 2011 Published by Elsevier Ltd. C1 [Buter, R. K.; van Raan, A. F. J.] Leiden Univ, Ctr Sci & Technol Studies, NL-2300 RA Leiden, Netherlands. RP Buter, RK (reprint author), Wassenaarseweg 62A,POB 905, NL-2300 AX Leiden, Netherlands. EM buter@cwts.leidenuniv.nl; vanraan@cwts.leidenuniv.nl CR Aho A. 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PD OCT PY 2011 VL 5 IS 4 BP 608 EP 617 DI 10.1016/j.joi.2011.05.008 PG 10 WC Information Science & Library Science SC Information Science & Library Science GA 841PI UT WOS:000296524200012 ER PT J AU Butler, L AF Butler, Linda TI The devil is in the detail: Concerns about Vanclay's analysis of Australian journal rankings SO JOURNAL OF INFORMETRICS LA English DT Letter C1 Australian Natl Univ, Sch Polit & Int Relat, Canberra, ACT 0200, Australia. RP Butler, L (reprint author), Australian Natl Univ, Sch Polit & Int Relat, GPO Box 4, Canberra, ACT 0200, Australia. EM linda.butler52@gmail.com CR *ARC, 2011, REV ERA 2010 RANK OU *ARC, 2010, KEY DOC SPEC ERA 201 ARC, 2011, ERA 2010 NAT REP ARC, 2010, RANK OUTL Lamp J. W., 2010, AUSTRALASIAN J INFOR, V16, P5 Pontille D, 2010, RES EVALUAT, V19, P347, DOI 10.3152/095820210X12809191250889 Vanclay JK, 2011, J INFORMETR, V5, P265, DOI 10.1016/j.joi.2010.12.001 NR 7 TC 5 Z9 5 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 1751-1577 J9 J INFORMETR JI J. Informetr. PD OCT PY 2011 VL 5 IS 4 BP 693 EP 694 DI 10.1016/j.joi.2011.04.001 PG 2 WC Information Science & Library Science SC Information Science & Library Science GA 841PI UT WOS:000296524200019 ER PT J AU Wu, J Lozano, S Helbing, D AF Wu, Jiang Lozano, Sergi Helbing, Dirk TI Empirical study of the growth dynamics in real career h-index sequences SO JOURNAL OF INFORMETRICS LA English DT Article DE h-Index sequence; Real career path; h-Index core ID HIRSCH INDEX; MODEL AB Based on historical citation data from the ISI Web of Science, this paper introduces a methodology to automatically calculate and classify the real career h-index sequences of scientists. Such a classification is based on the convexity-concavity features of the different temporal segments of h-index sequences. Five categories are identified, namely convex, concave, S-shaped, IS-shaped and linear. As a case study, the h-index sequences of several Nobel Prize winners in Medicine, Chemistry and Economics are investigated. Two proposed factors influencing the growth of the h-index, namely the "freshness" of the h-index core and changes in the rank positions of papers near the h-index point are studied. It is found that the h-index core's "freshness" is particularly relevant to the growth of the h-index. Moreover, although in general more publications lead to an increase of the h-index, the key role is played by those papers near the h-index point. (C) 2011 Elsevier Ltd. All rights reserved. C1 [Wu, Jiang] Huazhong Univ Sci & Technol, Sch Management, Wuhan 430074, Peoples R China. [Wu, Jiang; Lozano, Sergi; Helbing, Dirk] Swiss Fed Inst Technol, CH-9092 Zurich, Switzerland. RP Wu, J (reprint author), Huazhong Univ Sci & Technol, Sch Management, Wuhan 430074, Peoples R China. EM jiangwu.john@gmail.com; slozano@ethz.ch; dhelbing@ethz.ch RI Lozano, Sergi/B-5974-2015 OI Lozano, Sergi/0000-0003-1895-9327 CR Burrell QL, 2007, SCIENTOMETRICS, V73, P19, DOI 10.1007/s11192-006-1774-5 Burrell QL, 2007, J INFORMETR, V1, P16, DOI 10.1016/j.joi.2006.07.001 Egghe L, 2009, INFORM PROCESS MANAG, V45, P288, DOI 10.1016/j.ipm.2008.12.002 Egghe L, 2010, ANNU REV INFORM SCI, V44, P65 Egghe L, 2009, SCIENTOMETRICS, V81, P311, DOI 10.1007/s11192-008-2170-0 Guns R, 2009, J AM SOC INF SCI TEC, V60, P410, DOI 10.1002/asi.20973 Hirsch JE, 2005, P NATL ACAD SCI USA, V102, P16569, DOI 10.1073/pnas.0507655102 Liang LM, 2006, SCIENTOMETRICS, V69, P153, DOI 10.1007/s11192-006-0145-6 Liu YX, 2008, J INFORMETR, V2, P202, DOI 10.1016/j.joi.2008.04.003 RONALD R, 2008, J AM SOC INFORM SCI, V59, P2305 Rousseau R., 2006, SCI FOCUS, V1, P23 Ye FY, 2008, J INFORMETR, V2, P288, DOI 10.1016/j.joi.2008.09.002 NR 12 TC 5 Z9 5 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 1751-1577 J9 J INFORMETR JI J. Informetr. PD OCT PY 2011 VL 5 IS 4 BP 489 EP 497 DI 10.1016/j.joi.2011.02.003 PG 9 WC Information Science & Library Science SC Information Science & Library Science GA 841PI UT WOS:000296524200001 ER PT J AU Baccini, A Barabesi, L AF Baccini, Alberto Barabesi, Lucio TI Seats at the table: The network of the editorial boards in information and library science SO JOURNAL OF INFORMETRICS LA English DT Article DE Network; Academic journal; Editorial board; Interlocking editorship; Journal gatekeeper; Library and Information Science ID JOURNAL GATEKEEPERS AB The structural properties of the network generated by the editorial activities of the members of the boards of "Information Science & Library Science" journals are explored through network analysis techniques. The crossed presence of scholars on editorial boards, the phenomenon called interlocking editorship, is considered a proxy of the similarity of editorial policies. The evidences support the idea that this group of journals is better described as a set of only relatively connected subfields. In particular two main subfields are identified, consisting of research oriented journals devoted respectively to LIS and MIS. The links between these two subsets are weak. Around these two subsets there are a lot of (relatively) isolated professional journals or journals characterized more by their subject-matter content than by their focus on information flows. It is possible to suggest that this configuration of the network may be the consequence of the youthfulness of Information Science & Library Science, which has not permitted yet to reach a general consensus through scholars on research aims, methods and instruments. (C) 2011 Elsevier Ltd. All rights reserved. C1 [Baccini, Alberto; Barabesi, Lucio] Univ Siena, Dipartimento Econ Polit, I-53100 Siena, Italy. RP Baccini, A (reprint author), Univ Siena, Dipartimento Econ Polit, Via PA Mattioli 10, I-53100 Siena, Italy. EM alberto.baccini@unisi.it CR Baccini A, 2010, SCIENTOMETRICS, V82, P365, DOI 10.1007/s11192-009-0053-7 Baccini A, 2009, RIV ITALIANA EC, V14, P491 Baccini A., 2009, CHANCE, V22, P34 Bar-Ilan J, 2010, J INFORMETR, V4, P141, DOI 10.1016/j.joi.2009.11.006 Bedeian AG, 2009, ORGAN RES METHODS, V12, P211, DOI 10.1177/1094428107309312 BOLL S, 2007, SCIENTOMETRIC METHOD Braun T, 2004, HANDBOOK OF QUANTITATIVE SCIENCE AND TECHNOLOGY RESEARCH: THE USE OF PUBLICATION AND PATENT STATISTICS IN STUDIES OF S&T SYSTEMS, P95 Braun T, 2005, SCIENTOMETRICS, V64, P113, DOI 10.1007/s11192-005-0243-x Braun T, 2007, SCIENTOMETRICS, V71, P155, DOI 10.1007/s11192-007-1843-4 Cronin B, 2009, J AM SOC INF SCI TEC, V60, P2387, DOI 10.1002/asi.21213 De Nooy W., 2005, EXPLORATORY SOCIAL N Hames I., 2007, PEER REV MANUSCRIPT Hodgson G. M., 1999, ECON J, V109, P165, DOI 10.1111/1468-0297.00407 Merton R. 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TI Gender differences in peer reviews of grant applications: A substantive-methodological synergy in support of the null hypothesis model SO JOURNAL OF INFORMETRICS LA English DT Article DE Peer review; Gender differences; Multilevel cross-classified models; Validity; Generalizability ID FEMALE COLLEGE-TEACHERS; STUDENTS VIEWS; SCIENCE; RELIABILITY; WOMEN; BIAS; METAANALYSIS; ASSESSMENTS; MANUSCRIPT; PSYCHOLOGY AB Peer review serves a gatekeeper role, the final arbiter of what is valued in academia, but is widely criticized in terms of potential biases-particularly in relation to gender. In this substantive-methodological synergy, we demonstrate methodological and multilevel statistical approaches to testing a null hypothesis model in relation to the effect of researcher gender on peer reviews of grant proposals, based on 10,023 reviews by 6233 external assessors of 2331 proposals from social science, humanities, and science disciplines. Utilizing multilevel cross-classified models, we show that support for the null hypothesis model positing researcher gender has no significant effect on proposal outcomes. Furthermore, these non-effects of gender generalize over assessor gender (contrary to a matching hypothesis), discipline, assessors chosen by the researchers themselves compared to those chosen by the funding agency, and country of the assessor. Given the large, diverse sample, the powerful statistical analyses, and support for generalizability, these results - coupled with findings from previous research - offer strong support for the null hypothesis model of no gender differences in peer reviews of grant proposals. (C) 2010 Elsevier Ltd. All rights reserved. C1 [Marsh, Herbert W.] Univ Oxford, Dept Educ, Oxford OX2 6PY, England. [Jayasinghe, Upali W.] Univ New S Wales, Sydney, NSW 2052, Australia. [Jayasinghe, Upali W.; Bond, Nigel W.] Univ Western Sydney, Penrith, NSW 1797, Australia. 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Informetr. PD JAN PY 2011 VL 5 IS 1 BP 167 EP 180 DI 10.1016/j.joi.2010.10.004 PG 14 WC Information Science & Library Science SC Information Science & Library Science GA 698WS UT WOS:000285626000013 ER PT J AU Ortega, JL Aguillo, I AF Luis Ortega, Jose Aguillo, Isidro TI Differences between web sessions according to the origin of their visits SO JOURNAL OF INFORMETRICS LA English DT Article DE Webometrics; Web usage mining; Web session; Log file analysis; Search engines; Navigational patterns ID LOG ANALYSIS; SEARCH; IDENTIFICATION AB The aim of this paper is to characterize the distribution of number of hits and spent time by web session. It also expects to find if there are significant differences between the length and the duration of a session with regard to the point of access-search engine, link or root. Web usage mining was used to analyse 17,174 web sessions that were identified from the webometrics.info web site. Results show that both distribution of length and duration follow an exponential decay. Significant differences between the different origins of the visits were also found, being the search engines' users those who spent most time and did more clicks in their sessions. We conclude that a good SEO policy would be justified, because search engines are the principal intermediaries to this web site. (C) 2010 Elsevier Ltd. All rights reserved. C1 [Luis Ortega, Jose] CSIC, Madrid 28006, Spain. [Aguillo, Isidro] CSIC, CCHS, Cybermetr Lab, Madrid 28037, Spain. RP Ortega, JL (reprint author), CSIC, Serrano 113, Madrid 28006, Spain. 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Informetr. PD JUL PY 2010 VL 4 IS 3 BP 331 EP 337 DI 10.1016/j.joi.2010.02.001 PG 7 WC Information Science & Library Science SC Information Science & Library Science GA 607YQ UT WOS:000278543600012 ER PT J AU Rousseau, R Yang, LY Yue, T AF Rousseau, Ronald Yang, Liying Yue, Ting TI A discussion of Prathap's h(2)-index for institutional evaluation with an application in the field of HIV infection and therapy SO JOURNAL OF INFORMETRICS LA English DT Article; Proceedings Paper CT 1st Joint ASIS&T/ISS Conference Seminar 2009 CY NOV 07, 2009 CL Vancouver, CANADA DE Institutional evaluation; h-Index; Prathap's h-indices; Ratio indicator; HIV research; Stability; Ortega hypothesis; Ecclesiastes hypothesis ID SUCCESSIVE H-INDEXES; SCIENTIFIC-RESEARCH OUTPUT; HIRSCH-TYPE INDEXES; ORTEGA HYPOTHESIS; IMPACT AB Hirsch-type indices are not only used for the evaluation of individual scientists but also for institutional evaluation. In particular, Prathap's suggestion, using the pair of h-indices (h(1)-h(2)) seems a promising approach. This paper discusses these h-indices, incorporating moreover a Molinari correction for size. We provide a theoretical framework and provide practical examples in the field of HIV infection and therapy. It is shown that the National Cancer Institute (NCI, USA) and Harvard University are the leading institutes in this field (in the world). If, however, size is controlled according to the Molinari approach, the National Institute of Allergy and Infectious Diseases (NIAID, USA) becomes the leader. In addition, we provide a new structural index: the ratio h(2)/h(1). It is suggested that this ratio indicator is related to the stability of the research performed at an institute or university. The term stability is used here in the sense of not depending on a small group of scientists that could easily move to another university or institute. (C) 2009 Elsevier Ltd. All rights reserved. C1 [Rousseau, Ronald] KHBO Assoc KU Leuven, B-8400 Oostende, Belgium. [Rousseau, Ronald] Katholieke Univ Leuven, Dept Math, B-3001 Heverlee, Belgium. [Yang, Liying; Yue, Ting] Chinese Acad Sci, Natl Sci Lib, Beijing 100080, Peoples R China. RP Rousseau, R (reprint author), KHBO Assoc KU Leuven, B-8400 Oostende, Belgium. EM ronald.rousseau@khbo.be; yangly@mail.las.ac.cn; yuet@mail.las.ac.cn CR Arencibia-Jorge R, 2008, J AM SOC INF SCI TEC, V59, P155, DOI 10.1002/asi.20729 Arencibia-Jorge R, 2009, SCIENTOMETRICS, V79, P507, DOI 10.1007/s11192-007-2025-0 Bornmann L, 2008, J AM SOC INF SCI TEC, V59, P830, DOI 10.1002/asi.20806 Chai J., 2008, P WIS 2008 4 INT C W COLE JR, 1969, THESIS COLUMBIA U COLE JR, 1972, SCIENCE, V178, P368, DOI 10.1126/science.178.4059.368 COLE S, 1987, SCIENTOMETRICS, V12, P343 Egghe L, 2008, SCIENTOMETRICS, V77, P377, DOI 10.1007/s11192-007-1968-5 Egghe L, 2008, J AM SOC INF SCI TEC, V59, P1276, DOI 10.1002/asi.20809 Egghe L, 2010, ANNU REV INFORM SCI, V44, P65 Egghe L., 2006, ISSI NEWSLETTER, V2, P8 Egghe L, 2008, J AM SOC INF SCI TEC, V59, P1608, DOI 10.1002/asi.20845 Glanzel W., 2006, SCI FOCUS, V1, P10 Guns R, 2009, J INFORMETR, V3, P64, DOI 10.1016/j.joi.2008.11.004 Hirsch JE, 2005, P NATL ACAD SCI USA, V102, P16569, DOI 10.1073/pnas.0507655102 HOERMAN HL, 1995, LIBR QUART, V65, P415 HU XJ, J INFORM SC IN PRESS Jin BH, 2007, CHINESE SCI BULL, V52, P855, DOI 10.1007/s11434-007-0145-9 Kinney AL, 2007, P NATL ACAD SCI USA, V104, P17943, DOI 10.1073/pnas.0704416104 Kosmulski M., 2006, FORUM AKAD, P31 Liu YX, 2009, SCIENTOMETRICS, V79, P235, DOI 10.1007/s11192-009-0415-1 Molinari JF, 2008, SCIENTOMETRICS, V75, P163, DOI 10.1007/s11192-007-1853-2 Prathap G, 2006, CURR SCI INDIA, V91, P1439 Rousseau R., 2008, COLLNET J SCIENTOMET, V2, P1 Rousseau R, 2008, J INFORMETR, V2, P335, DOI 10.1016/j.joi.2008.07.001 Schreiber M, 2008, J INFORMETR, V2, P211, DOI 10.1016/j.joi.2008.05.001 Schubert A, 2007, SCIENTOMETRICS, V70, P201, DOI 10.1007/s11192-007-0112-x Ruane F, 2008, SCIENTOMETRICS, V75, P395, DOI 10.1007/s11192-007-1869-7 TURNER SP, 1976, SOC SCI INFORM, V15, P657, DOI 10.1177/053901847601500407 Woeginger GJ, 2008, MATH SOC SCI, V56, P224, DOI 10.1016/j.mathsocsci.2008.03.001 NR 30 TC 5 Z9 5 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 1751-1577 J9 J INFORMETR JI J. Informetr. PD APR PY 2010 VL 4 IS 2 BP 175 EP 184 DI 10.1016/j.joi.2009.11.007 PG 10 WC Information Science & Library Science SC Information Science & Library Science GA 568II UT WOS:000275515500006 ER PT J AU Yu, LP Chen, YQ Pan, YT Wu, YS AF Yu Liping Chen Yuqing Pan Yuntao Wu Yishan TI Research on the evaluation of academic journals based on structural equation modeling SO JOURNAL OF INFORMETRICS LA English DT Article DE Academic journal; Evaluation; Structural equation modeling ID BIBLIOMETRIC TOOLS; PERFORMANCE; IMPACT; OUTPUT; INDEX AB This paper classifies common journal evaluation indicators into three categories, namely three first-level indicators. They are respectively the indicators on journal impact, on timeliness, and on journal characteristics. The data used here is drawn from the medical journals in CSTPCD, a citation database built by the Institute of Scientific and Technical Information of China. The three categories of indicators are correlated with one another, so a structural equation may be established. Then we calculate the value of three first-level indicators and give subjective weights to the indicators. The comprehensive evaluation upon the medical journals yields satisfactory results. By simulating the complex relationship among journal indicators, the structural equation can be used for the estimation of some implicit indicators and the screening of indicators. This approach provides a new perspective for scientific and technological evaluation in general sense. It should be noted that the availability of basic data and the rationality of modeling bear much upon the evaluation results. (C) 2009 Elsevier Ltd. All rights reserved. C1 [Yu Liping; Pan Yuntao; Wu Yishan] Inst Sci & Tech Informat China, Beijing 100038, Peoples R China. [Chen Yuqing] Southeast Univ, Nanjing 211189, Peoples R China. RP Wu, YS (reprint author), Inst Sci & Tech Informat China, Beijing 100038, Peoples R China. EM wuyishan@istic.ac.cn CR BRAUN T, 1990, SCIENTOMETRICS, V19, P159, DOI 10.1007/BF02095344 Braun T., 1983, P 1 NAT C INT PART S, P80 Esty D. 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Informetr. PD OCT PY 2009 VL 3 IS 4 BP 304 EP 311 DI 10.1016/j.joi.2009.04.002 PG 8 WC Information Science & Library Science SC Information Science & Library Science GA 484VB UT WOS:000269075100004 ER PT J AU Eom, S AF Eom, Sean TI All author cocitation analysis and first author cocitation analysis: A comparative empirical investigation SO JOURNAL OF INFORMETRICS LA English DT Article DE author cocitation analysis; all author ACA; first author ACA ID SYSTEMS; SCIENCE AB The majority of author cocitation analysis (ACA) have relied on the Institute for Scientific Information (ISI) citation databases. ISI convention allows only the retrieval of papers that cite works of which the author is first or sole author. Non-primary authors (authors whose name appear in second or later position) will not be counted when assembling a cocitation frequency matrix. Therefore, this has been a methodological issue in ACA study. This paper empirically examines the impact of the ISI convention on the results of ACA. Previous research has addressed and shed light on some parts of methodological issues, but failed to address issues such as to what extent the use of different approach has resulted in different outcomes in terms of actual intellectual structure of a given academic discipline. Using our data and cociation matrix generation systems, we compare the differences in the process and outcomes of using different cocitation matrices. Our study concludes that all author based ACA is better than first author based ACA to capture all influential researchers in a field. It also identifies more research subspecialties. Finally, all Author based ACA and first author based ACA produce little differences in stress values of MDS outputs. Published by Elsevier Ltd. C1 SE Missouri State Univ, Dept Accounting & MIS, Cape Girardeau, MO 63701 USA. 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Informetr. PY 2008 VL 2 IS 1 BP 53 EP 64 DI 10.1016/j.joi.2007.09.001 PG 12 WC Information Science & Library Science SC Information Science & Library Science GA 270LL UT WOS:000253722200002 ER PT J AU Lafouge, T AF Lafouge, Thierry TI The source-item coverage of the exponential function SO JOURNAL OF INFORMETRICS LA English DT Article DE exponential function; mathematical-fitting; Lotkaian informetrics ID INFORMETRIC DISTRIBUTIONS; LAW AB Statistical distributions in the production of information are most often studied in the framework of Lotkaian informetrics. In this paper, we recall some results of basic theory of Lotkaian informetrics, then we transpose methods (Theorem 1) applied to Lotkaian distributions by Leo Egghe (Theorem 2) to the exponential distributions (Theorem 3, Theorem 4). We give examples and compare the results (Theorem 5). Finally, we propose to widen the problem using the concept of exponential informetric process (Theorem 6). (c) 2006 Elsevier Ltd. All rights reserved. C1 Univ Lyon 1, Lab Ursidoc, F-69622 Villeurbanne, France. RP Lafouge, T (reprint author), Univ Lyon 1, Lab Ursidoc, 43 Blvd 11 Novembre 1918, F-69622 Villeurbanne, France. 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Informetr. PD JAN PY 2007 VL 1 IS 1 BP 59 EP 67 DI 10.1016/j.joi.2006.09.004 PG 9 WC Information Science & Library Science SC Information Science & Library Science GA 274AN UT WOS:000253974300008 ER PT J AU Harzing, AW Giroud, A AF Harzing, Anne-Wil Giroud, Axele TI The competitive advantage of nations: An application to academia SO JOURNAL OF INFORMETRICS LA English DT Article DE Revealed comparative advantage; Academic disciplines; Essential science indicators; Scientific productivity ID 27 SCIENCE AREAS; SOCIAL-SCIENCES; DISCIPLINARY STRUCTURE; SCIENTOMETRIC WEIGHT; SCIENTIFIC WEALTH; HUMANITIES; COUNTRIES; PATTERNS; TRADE; INDICATORS AB Within the field of bibliometrics, there is sustained interest in how nations "compete" in terms of academic disciplines, and what determinants explain why countries may have a specific advantage in one discipline over another. However, this literature has not, to date, presented a comprehensive structured model that could be used in the interpretation of a country's research profile and academic output. In this paper, we use frameworks from international business and economics to present such a model. Our study makes four major contributions. First, we include a very wide range of countries and disciplines, explicitly including the Social Sciences, which unfortunately are excluded in most bibliometrics studies. Second, we apply theories of revealed comparative advantage and the competitive advantage of nations to academic disciplines. Third, we cluster our 34 countries into five different groups that have distinct combinations of revealed comparative advantage in five major disciplines. Finally, based on our empirical work and prior literature, we present an academic diamond that details factors likely to explain a country's research profile and competitiveness in certain disciplines. (C) 2013 Elsevier Ltd. All rights reserved. C1 [Harzing, Anne-Wil] Univ Melbourne, Dept Management & Mkt, Melbourne, Vic 3010, Australia. [Giroud, Axele] Manchester Business Sch, Manchester M15 6PB, Lancs, England. RP Harzing, AW (reprint author), Univ Melbourne, Dept Management & Mkt, Parkville Campus, Melbourne, Vic 3010, Australia. EM harzing@unimelb.edu.au; Axele.Giroud@mbs.ac.uk RI Harzing, Anne-Wil/C-7472-2014; Golwal, Madansing/A-1097-2015 OI Harzing, Anne-Wil/0000-0003-1509-3003; CR Adams J, 2011, GLOBAL RES REPORT UK Adams J., 2009, GLOBAL RES REPORT IN Almeida JAS, 2009, J INFORMETR, V3, P134, DOI 10.1016/j.joi.2009.01.001 [Anonymous], 2011, GLOB COMP ADV CHANG Archambault E, 2006, SCIENTOMETRICS, V68, P329, DOI 10.1007/s11192-006-0115-z BALASSA B, 1965, MANCH SCH ECON SOC, V33, P99, DOI 10.1111/j.1467-9957.1965.tb00050.x Bertsch T., 2000, P ACAD ED LEADERSHIP, V5, P66 BIE, 1996, PERF PUBL PAP BRAUN T, 1995, SCIENTOMETRICS, V34, P207, DOI 10.1007/BF02020421 BRAUN T, 1995, SCIENTOMETRICS, V33, P263, DOI 10.1007/BF02017332 Choung JY, 2013, SCIENTOMETRICS, V94, P629, DOI 10.1007/s11192-012-0780-z Choung JY, 2000, SCIENTOMETRICS, V48, P413, DOI 10.1023/A:1005696606595 CIA, 2012, WORLD FACTB CIA, 2004, WORLD FACTB Cronin B, 2008, J AM SOC INF SCI TEC, V59, P551, DOI 10.1002/asi.20764 Dogl C, 2010, J E EUR MANAG STUD, V15, P34 Engels TCE, 2012, SCIENTOMETRICS, V93, P373, DOI 10.1007/s11192-012-0680-2 FRAME J D, 1977, Interciencia, V2, P143 FWF, 2007, CONT NAT FAR IS AUST Garg KC, 2003, SCIENTOMETRICS, V56, P169, DOI 10.1023/A:1021963010621 Glanzel W, 2008, SCIENTOMETRICS, V74, P71, DOI 10.1007/s11192-008-0104-5 Glanzel W, 2006, SCIENTOMETRICS, V67, P67, DOI 10.1556/Scient.67.2006.1.5 GRANT RM, 1991, STRATEGIC MANAGE J, V12, P535, DOI 10.1002/smj.4250120706 Harzing AW, 2013, MANAGE INT REV, V53, P169, DOI 10.1007/s11575-011-0124-x Harzing AW, 2013, SCIENTOMETRICS, V94, P1057, DOI 10.1007/s11192-012-0777-7 Harzing A.W., 2007, ETHICS SCI ENV POLIT, V8, P61, DOI DOI 10.3354/esep00076 Hemmert M., 2012, TIGER MANAGEMENT KOR HOBDAY M, 1995, WORLD DEV, V23, P1171, DOI 10.1016/0305-750X(95)00035-B Horta H, 2007, TECHNOL FORECAST SOC, V74, P1334, DOI 10.1016/j.techfore.2007.02.013 Inonu E, 2003, SCIENTOMETRICS, V56, P137, DOI 10.1023/A:1021906925642 International Monetary Fund (IMF), 2011, CHANG PATT GLOB TRAD Irvine J., 1984, FORESIGHT SCI PICKIN Ketels C. 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PD JAN PY 2014 VL 8 IS 1 BP 29 EP 42 DI 10.1016/j.joi.2013.10.007 PG 14 WC Information Science & Library Science SC Information Science & Library Science GA AB4PH UT WOS:000331771900004 ER PT J AU Bornmann, L AF Bornmann, Lutz TI The problem of citation impact assessments for recent publication years in institutional evaluations SO JOURNAL OF INFORMETRICS LA English DT Article DE Bibliometrics; Percentiles; Citation window; Population; Sample; Counterfactual concept of causality ID PERCENTILE RANK CLASSES; BIBLIOMETRICS; COUNTS AB Bibliometrics has become an indispensable tool in the evaluation of institutions (in the natural and life sciences). An evaluation report without bibliometric data has become a rarity. However, evaluations are often required to measure the citation impact of publications in very recent years in particular. As a citation analysis is only meaningful for publications for which a citation window of at least three years is guaranteed, very recent years cannot (should not) be included in the analysis. This study presents various options for dealing with this problem in statistical analysis. The publications from two universities from 2000 to 2011 are used as a sample dataset (n = 2652, univ 1 = 1484 and univ 2 = 1168). One option is to show the citation impact data (percentiles) in a graphic and to use a line for percentiles regressed on 'distant' publication years (with confidence interval) showing the trend for the 'very recent' publication years. Another way of dealing with the problem is to work with the concept of samples and populations. The third option (very related to the second) is the application of the counterfactual concept of causality. (C) 2013 Elsevier Ltd. All rights reserved. C1 Adm Headquarters Max Planck Soc, Div Sci & Innovat Studies, D-80539 Munich, Germany. RP Bornmann, L (reprint author), Adm Headquarters Max Planck Soc, Div Sci & Innovat Studies, Hofgartenstr 8, D-80539 Munich, Germany. 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To increase the h-index to h + 1 we minimally need (h + 1)(2) citations, an increment of I-1(h) = 2h + 1. The latter number increases with 2 per unit increase of h. This increment of the second order is denoted I-2(h) =2. If we define I-1 and I-2 for a general Hirsch configuration (say n papers each having f(n) citations) we calculate I-1(f) and I-2(f) similarly as for the h-index. We characterize all functions f for which I-2(f) = 2 and show that this can be obtained for functions f(n) different from the h-index. We show that f(n) = n (i.e. the h-index) if and only if I-2(f) = 2, f(1) = 1 and f(2) = 2. We give a similar characterization for the threshold index (where n papers have a constant number C of citations). Here we deal with second order increments I-2(f) = 0. (c) 2013 Elsevier Ltd. All rights reserved. C1 [Egghe, L.] Univ Hasselt, B-3590 Diepenbeek, Belgium. [Egghe, L.] Univ Antwerp, IBW, B-2000 Antwerp, Belgium. RP Egghe, L (reprint author), Univ Hasselt, Campus Diepenbeek,Agoralaan, B-3590 Diepenbeek, Belgium. EM leo.egghe@uhasselt.be CR Egghe L, 2011, J INFORMETR, V5, P439, DOI 10.1016/j.joi.2011.03.006 Hirsch JE, 2005, P NATL ACAD SCI USA, V102, P16569, DOI 10.1073/pnas.0507655102 Kosmulski M., 2006, ISSI NEWSLETTER, V2, P4 Waltman L, 2012, J AM SOC INF SCI TEC, V63, P406, DOI 10.1002/asi.21678 Wu Q, 2010, J AM SOC INF SCI TEC, V61, P609, DOI 10.1002/asi.21276 NR 5 TC 4 Z9 4 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 1751-1577 J9 J INFORMETR JI J. Informetr. PY 2013 VL 7 IS 2 BP 388 EP 393 DI 10.1016/j.joi.2013.01.005 PG 6 WC Information Science & Library Science SC Information Science & Library Science GA 136PY UT WOS:000318377100016 ER PT J AU Finardi, U AF Finardi, Ugo TI Correlation between Journal Impact Factor and Citation Performance: An experimental study SO JOURNAL OF INFORMETRICS LA English DT Article DE Garfield; Journal Impact Factor; Article citations; Correlation coefficients; Time evolution; Impact factor misuses ID RANK CORRELATION COEFFICIENTS; INDICATORS; SCIENCE; TESTS; DISTRIBUTIONS; CRITIQUE; HISTORY; METRICS; INDEXES; IDEAS AB Since its introduction, the Journal Impact Factor has probably been the most extensively adopted bibliometric indicator. Notwithstanding its well-known strengths and limits, it is still widely misused as a tool for evaluation, well beyond the purposes it was intended for. In order to shed further light on its nature, the present work studies how the correlation between the Journal Impact Factor and the (time-weighed) article Mean Received Citations (intended as a measure of journal performance) has evolved through time. It focuses on a sample of hard sciences and social sciences journals from the 1999 to 2010 time period. Correlation coefficients (Pearson's Coefficients as well as Spearman's Coefficients and Kendall's tau(alpha)) are calculated and then tested against several null hypotheses. The results show that in most cases Journal Impact Factors and their yearly variations do not display a strong correlation with citedness. Differences also exist among scientific areas. (c) 2012 Elsevier Ltd. All rights reserved. C1 [Finardi, Ugo] CNR CERIS, Natl Res Council Italy, Inst Econ Res Firms & Growth, I-10024 Moncalieri, TO, Italy. [Finardi, Ugo] Univ Turin, Dept Chem, I-10125 Turin, Italy. 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Informetr. PY 2013 VL 7 IS 2 BP 357 EP 370 DI 10.1016/j.joi.2012.12.004 PG 14 WC Information Science & Library Science SC Information Science & Library Science GA 136PY UT WOS:000318377100013 ER PT J AU Ortega, JL Aguillo, IF AF Luis Ortega, Jose Aguillo, Isidro F. TI Institutional and country collaboration in an online service of scientific profiles: Google Scholar Citations SO JOURNAL OF INFORMETRICS LA English DT Article DE Web bibliometrics; Google Scholar Citations; Research collaboration; Information visualization; Network analysis; Academic search engines ID INTERNATIONAL COLLABORATION; MULTIPLE AUTHORSHIP; SOCIAL-SCIENCES; NETWORKS; CENTRALITY; PATTERNS; COMPLEX; INDIA AB The purpose of this paper is to analyse and describe the topological properties of the institutional and national collaboration network from the profiles extracted from Google Scholar Citations (GSC). 19,912 unique profiles with "co-authors" were obtained from a web crawl performed in March 2012. Several statistical and network analysis techniques were used to map and analyse these collaboration relationships at the country and institution level. Results show that The United States dominates the world scientific map and that every research institution is grouped by national, geographical and cultural criteria. A clustering phenomenon based on the self-similarity and fractal properties of scale-free networks is also observed. We conclude that GSC is a suitable tool for collaboration studies only at macro level between countries and institutions. (c) 2013 Elsevier Ltd. All rights reserved. C1 [Luis Ortega, Jose] VICYT CSIC, Madrid 28006, Spain. [Aguillo, Isidro F.] CCHS CSIC, Cybermetr Lab, Madrid, Spain. RP Ortega, JL (reprint author), VICYT CSIC, Serrano 113, Madrid 28006, Spain. 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PY 2013 VL 7 IS 2 BP 394 EP 403 DI 10.1016/j.joi.2012.12.007 PG 10 WC Information Science & Library Science SC Information Science & Library Science GA 136PY UT WOS:000318377100017 ER PT J AU Sangwal, K AF Sangwal, Keshra TI Comparison of different mathematical functions for the analysis of citation distribution of papers of individual authors SO JOURNAL OF INFORMETRICS LA English DT Article DE Adsorption isotherms; Citation analysis; Citation rank-order distribution; Rank-frequency functions ID RANK-ORDER DISTRIBUTION; IMPACT FACTOR; HIRSCH-INDEX; ICEBERG HYPOTHESIS; LAW; NETWORKS; BEHAVIOR; UNIVERSALITY; PUBLICATION; STATISTICS AB The citation distribution of papers of selected individual authors was analyzed using five mathematical functions: power-law, stretched exponential, logarithmic, binomial and Langmuir-type. The former two functions have previously been proposed in the literature whereas the remaining three are novel and are derived following the concepts of growth kinetics of crystals in the presence of additives which act as inhibitors of growth. Analysis of the data of citation distribution of papers of the authors revealed that the value of the goodness-of-the-fit parameter R-2 was the highest for the empirical binomial relation, it was high and comparable for stretched exponential and Langmuir-type functions, relatively low for power law but it was the lowest for the logarithmic function. In the Langmuir-type function a parameter K, defined as Langmuir constant, characterizing the citation behavior of the authors has been identified. Based on the Langmuir-type function an expression for cumulative citations L relating the extrapolated value of citations l(0) corresponding to rank n = 0 for an author and his/her constant K and the number N of paper receiving citation l >= 1 is also proposed. (C) 2012 Elsevier Ltd. All rights reserved. C1 Lublin Univ Technol, Dept Appl Phys, PL-20618 Lublin, Poland. RP Sangwal, K (reprint author), Lublin Univ Technol, Dept Appl Phys, Ul Nadbystrzycka 38, PL-20618 Lublin, Poland. EM k.sangwal@pollub.pl CR Albert R, 2002, REV MOD PHYS, V74, P47, DOI 10.1103/RevModPhys.74.47 Barabasi AL, 1999, SCIENCE, V286, P509, DOI 10.1126/science.286.5439.509 Bornmann L, 2009, J AM SOC INF SCI TEC, V60, P1664, DOI 10.1002/asi.21076 Burrell QL, 2002, SCIENTOMETRICS, V53, P309, DOI 10.1023/A:1014816911511 Clauset A, 2009, SIAM REV, V51, P661, DOI 10.1137/070710111 Companario J. M., 2010, J AM SOC INFORM SCI, V61, P419 Eggers D. 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Informetr. PD JAN PY 2013 VL 7 IS 1 BP 36 EP 49 DI 10.1016/j.joi.2012.09.002 PG 14 WC Information Science & Library Science SC Information Science & Library Science GA 065BG UT WOS:000313121300004 ER PT J AU Solomon, DJ Laakso, M Bjork, BC AF Solomon, David J. Laakso, Mikael Bjork, Bo-Christer TI A longitudinal comparison of citation rates and growth among open access journals SO JOURNAL OF INFORMETRICS LA English DT Article DE Open access; Citation rate; Scopus; Article Processing Charge ID SCOPUS AB The study documents the growth in the number of journals and articles along with the increase in normalized citation rates of open access (OA) journals listed in the Scopus bibliographic database between 1999 and 2010. Longitudinal statistics on growth in journals/articles and citation rates are broken down by funding model, discipline, and whether the journal was launched or had converted to OA. The data were retrieved from the websites of SCIMago Journal and Country Rank (journal/article counts), JournalM3trics (SNIP2 values), Scopus (journal discipline) and Directory of Open Access Journals (DOAJ) (OA and funding status). OA journals/articles have grown much faster than subscription journals but still make up less that 12% of the journals in Scopus. Two-year citation averages for journals funded by Article Processing Charges (APCs) have reached the same level as subscription journals. Citation averages of OA journals funded by other means continue to lag well behind OA journals funded by APCs and subscription journals. We hypothesize this is less an issue of quality than due to the fact that such journals are commonly published in languages other than English and tend to be located outside the four major publishing countries. (C) 2013 Elsevier Ltd. All rights reserved. C1 [Solomon, David J.] Michigan State Univ, Dept Med, E Lansing, MI 48824 USA. [Solomon, David J.] Michigan State Univ, OMERAD, E Lansing, MI 48824 USA. [Laakso, Mikael; Bjork, Bo-Christer] Hanken Sch Econ, Helsinki 00101, Finland. RP Solomon, DJ (reprint author), Michigan State Univ, Dept Med, A-202 E Fee Hall, E Lansing, MI 48824 USA. 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Informetr. PY 2013 VL 7 IS 3 BP 642 EP 650 DI 10.1016/j.joi.2013.03.008 PG 9 WC Information Science & Library Science SC Information Science & Library Science GA 210UH UT WOS:000323859700008 ER PT J AU Tang, L AF Tang, Li TI Does "birds of a feather flock together" matter-Evidence from a longitudinal study on US-China scientific collaboration SO JOURNAL OF INFORMETRICS LA English DT Article DE Research evaluation; International collaboration; Panel regression ID SCIENCE-AND-TECHNOLOGY; CO-AUTHORSHIP; NANOTECHNOLOGY RESEARCH; CITATION ANALYSIS; IMPACT FACTORS; PRODUCTIVITY; POLICY; PUBLICATIONS; NANOSCIENCE; COOPERATION AB China's status as a scientific power, particularly in the emerging area of nanotechnology, has become widely accepted in the global scientific community. The role of knowledge spillover in China's nanotechnology development is generally assumed, albeit without much convincing evidence. Very little has been investigated on the different mechanisms of knowledge spillover. Utilizing both cross-sectional data and longitudinal data of 77 Chinese nanoscientists' publications, this study aims to differentiate individual effects from the effect of international collaboration on the research performance of Chinese researchers. The study finds evidence in support of the "birds of a feather flock together" argument - that China's best scientists collaborate at international level. It also finds that collaboration across national boundaries has a consistently positive effect on China's nano research quality with a time-decaying pattern. Language turns out to be the most influential factor impacting the quality or visibility of Chinese nano research. Policy implications on research evaluation, human capital management, and public research and development allocation are also discussed in the end. (c) 2012 Elsevier Ltd. All rights reserved. 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TI On time-varying collaboration networks SO JOURNAL OF INFORMETRICS LA English DT Article DE Collaborative networks; Time-varying networks; Complex networks; Pattern recognition AB The patterns of scientific collaboration have been frequently investigated in terms of complex networks without reference to time evolution. In the present work, we derive collaborative networks (from the arXiv repository) parameterized along time. By defining the concept of affine group, we identify several interesting trends in scientific collaboration, including the fact that the average size of the affine groups grows exponentially, while the number of authors increases as a power law. We were therefore able to identify, through extrapolation, the possible date when a single affine group is expected to emerge. Characteristic collaboration patterns were identified for each researcher, and their analysis revealed that larger affine groups tend to be less stable. (c) 2012 Elsevier Ltd. All rights reserved. C1 [Viana, Matheus P.] Univ Calif Irvine, Irvine, CA 92717 USA. [Amancio, Diego R.; Costa, Luciano da F.] Univ Sao Paulo, Inst Phys Sao Carlos, BR-13560970 Sao Paulo, Brazil. RP Viana, MP (reprint author), Univ Calif Irvine, Irvine, CA 92717 USA. EM vianamp@gmail.com RI Costa, Luciano/H-5475-2011; Amancio, Diego/I-1071-2012 CR Amancio D. R., 2012, SCIENTOMETRICS, V90, P2 Amancio D. R., 2012, J INFORMETRICS, V6 Chen P., 2010, J INFORMETR, V4, P3 Costa LD, 2007, ADV PHYS, V56, P167, DOI 10.1080/00018730601170527 da F., 2012, EUROPHYSICS LETT, V99 Ding Y., 2011, J INFORMETRICS, V5 Girvan M., 2002, P NATL ACAD SCI US, V99 Hsiang L. 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Wang, Fang Deng, Yan Ou, Fengrong Bennett, James Liu, Yang Wang, Ge TI A bibliometric analysis of academic publication and NIH funding SO JOURNAL OF INFORMETRICS LA English DT Article DE Bibliometric analysis; Citation analysis; h-Index; a-Index; Research funding; Race/ethnicity ID H-INDEX; CITATION ANALYSIS; RACE DISPARITY; IMPACT; AUTHOR; PERFORMANCE; SCIENTISTS; SCIENCE; CREDIT; AWARDS AB Academic productivity and research funding have been hot topics in biomedical research. While publications and their citations are popular indicators of academic productivity, there has been no rigorous way to quantify co-authors' relative contributions. This has seriously compromised quantitative studies on the relationship between academic productivity and research funding. Here we apply an axiomatic approach and associated bibliometric measures to revisit a recent study by Ginther et al. (Ginther et al., 2011a,b) in which the probability of receiving a U.S. National Institutes of Health (NIH) R01 award was analyzed with respect to the applicant's race/ethnicity. Our results provide new insight and suggest that there is no significant racial bias in the NIH review process, in contrast to the conclusion from the study by D. K. Ginther et al. Our axiomatic approach has a potential to be widely used for scientific assessment and management. (c) 2012 Elsevier Ltd. All rights reserved. C1 [Yang, Jiansheng; Bennett, James; Wang, Ge] Virginia Tech, VT WFU Sch Biomed Engn & Sci, Blacksburg, VA 24061 USA. [Yang, Jiansheng] Peking Univ, Sch Math Sci, Beijing 100871, Peoples R China. [Vannier, Michael W.] Univ Chicago, Dept Radiol, Chicago, IL 60637 USA. [Wang, Fang; Deng, Yan; Ou, Fengrong; Liu, Yang] China Med Univ, Sch Publ Hlth, Shenyang, Peoples R China. RP Wang, G (reprint author), Virginia Tech, VT WFU Sch Biomed Engn & Sci, Blacksburg, VA 24061 USA. 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PY 2013 VL 7 IS 2 BP 318 EP 324 DI 10.1016/j.joi.2012.11.006 PG 7 WC Information Science & Library Science SC Information Science & Library Science GA 136PY UT WOS:000318377100009 ER PT J AU Liu, XZ Fang, H AF Liu, Xuan Zhen Fang, Hui TI Modifying h-index by allocating credit of multi-authored papers whose author names rank based on contribution SO JOURNAL OF INFORMETRICS LA English DT Article DE Citations; h-Index; Co-authorship; Author rank; Contribution evaluation ID HIRSCH-INDEX; PUBLICATIONS; CONSEQUENCES; MANUSCRIPTS; SCIENTISTS; COAUTHORS; MODEL AB In the present work we introduce a modification of the h-index for multi-authored papers with contribution based author name ranking. The modified h-index is denoted by h(mc)-index. It employs the framework of the h(m)-index, which in turn is a straightforward modification of the Hirsch index, proposed by Schreiber. To retain the merit of requiring no additional rearrangement of papers in the h(m)-index and in order to overcome its shortage of benefiting secondary authors at the expense of primary authors, h(mc)-index uses combined credit allocation (CCA) to replace fractionalized counting in the h(m)-index. The h(m)-index is a special form of h(mc)-index and fits for papers with equally important authors or alphabetically ordered authorship. There is a possibility of an author of lower contribution to the whole scientific community obtaining a higher h(mc)-index. Rational h(mc)-index, denoted by h(mcr)-index, can avoid it. A fictitious example as a model case and two empirical cases are analyzed. The correlations of the h(mcr)-index with the h-index and its several variants considering multiple co-authorship are inspected with 30 researchers' citation data. The results show that the h(mcr)-index is more reasonable for authors with different contributions. 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Informetr. PD OCT PY 2012 VL 6 IS 4 BP 557 EP 565 DI 10.1016/j.joi.2012.05.002 PG 9 WC Information Science & Library Science SC Information Science & Library Science GA 003AY UT WOS:000308581700013 ER PT J AU Ma, RM AF Ma, Ruimin TI Author bibliographic coupling analysis: A test based on a Chinese academic database SO JOURNAL OF INFORMETRICS LA English DT Article DE Author bibliographic coupling analysis; Author co-citation analysis; Domain mapping; Intellectual structure ID COCITATION ANALYSIS; INFORMATION-SCIENCE; TIME AB The paper first introduces the basic problems of author bibliographic coupling including the relationship between author bibliographic coupling and document bibliographic coupling as well as the three calculation methods of author coupling strength, namely, simple method, minimum method and combined method. Next I choose a small sample of authors in Chinese library and information science (LIS) as the research objects to have a comparative analysis of three types of author coupling strength algorithms (the data source is from the Chinese Social Sciences Citation Index (CSSCI)). The result shows that the minimum method is the most appropriate one to calculate the author coupling strength. Then a large sample of authors is chosen to analyze the intellectual structure of Chinese LIS. The result shows that author bibliographic coupling analysis (ABCA) can discover the intellectual structure of a discipline better. It is also found that compared with author cocitation analysis (ACA), ABCA has the advantage that it not only can discover the intellectual structure of a discipline more comprehensively and concretely but also can reflect the research frontier of the discipline. Finally, some practical problems that arise during this research are discussed. (C) 2012 Elsevier Ltd. 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PD OCT PY 2012 VL 6 IS 4 BP 619 EP 630 DI 10.1016/j.joi.2012.06.007 PG 12 WC Information Science & Library Science SC Information Science & Library Science GA 003AY UT WOS:000308581700020 ER PT J AU Amancio, DR Oliveira, ON Costa, LD AF Amancio, Diego Raphael Oliveira, Osvaldo Novais, Jr. Costa, Luciano da Fontoura TI Three-feature model to reproduce the topology of citation networks and the effects from authors' visibility on their h-index SO JOURNAL OF INFORMETRICS LA English DT Article DE Scientometry; h-Index; Citation networks; Complex networks; Network model ID COMPLEX NETWORKS; IMPACT; DISTRIBUTIONS; JOURNALS; DYNAMICS; QUALITY; LAW AB Various factors are believed to govern the selection of references in citation networks, but a precise, quantitative determination of their importance has remained elusive. In this paper, we show that three factors can account for the referencing pattern of citation networks for two topics, namely "graphenes" and "complex networks", thus allowing one to reproduce the topological features of the networks built with papers being the nodes and the edges established by citations. The most relevant factor was content similarity, while the other two - in-degree (i.e. citation counts) and age of publication - had varying importance depending on the topic studied. This dependence indicates that additional factors could play a role. Indeed, by intuition one should expect the reputation (or visibility) of authors and/or institutions to affect the referencing pattern, and this is only indirectly considered via the in-degree that should correlate with such reputation. Because information on reputation is not readily available, we simulated its effect on artificial citation networks considering two communities with distinct fitness (visibility) parameters. One community was assumed to have twice the fitness value of the other, which amounts to a double probability for a paper being cited. While the h-index for authors in the community with larger fitness evolved with time with slightly higher values than for the control network (no fitness considered), a drastic effect was noted for the community with smaller fitness. (C) 2012 Elsevier Ltd. All rights reserved. C1 [Amancio, Diego Raphael; Oliveira, Osvaldo Novais, Jr.; Costa, Luciano da Fontoura] Univ Sao Paulo, Inst Phys Sao Carlos, BR-13560970 Sao Carlos, SP, Brazil. RP Amancio, DR (reprint author), Univ Sao Paulo, Inst Phys Sao Carlos, POB 369, BR-13560970 Sao Carlos, SP, Brazil. 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RP Kosmulski, M (reprint author), Lublin Univ Technol, Dept Electrochem, Nadbystrzycka 38, PL-20618 Lublin, Poland. EM mkosmuls@abo.fi RI Kosmulski, Marek/B-9158-2009; Kosmulski, Marek/F-2326-2010 CR Franceschini F., SCIENTOMETR IN PRESS, DOI [10.1007/s11192-011-0570-z, DOI 10.1007/S11192-011-0570-Z] Kosmulski M, 2011, J INFORMETR, V5, P481, DOI 10.1016/j.joi.2011.03.001 NR 2 TC 4 Z9 4 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 1751-1577 J9 J INFORMETR JI J. Informetr. PD JUL PY 2012 VL 6 IS 3 BP 368 EP 369 DI 10.1016/j.joi.2012.02.004 PG 2 WC Information Science & Library Science SC Information Science & Library Science GA 937LN UT WOS:000303660100003 ER PT J AU Seiler, C Wohlrabe, K AF Seiler, Christian Wohlrabe, Klaus TI Ranking economists on the basis of many indicators: An alternative approach using RePEc data SO JOURNAL OF INFORMETRICS LA English DT Article DE RePEc; Ranking aggregation; Principal components analysis; Economics profession ID H-INDEX; BIBLIOMETRIC INDICATORS; DEPARTMENTAL RANKINGS; SOCIAL-SCIENCES; JOURNAL IMPACT; ECONOMETRICS; SCHOLAR AB In economics the Research Papers in Economics (RePEc) network has become an essential source for the gathering and the spread of both existing and new economic research. Furthermore, it is currently the largest bibliometric database in economic sciences containing 33 different indicators for more than 30,000 economists. Based on this bibliographic information RePEc calculates well-known rankings for authors and academic institutions. We provide some cautionary remarks concerning the interpretation of some provided bibliometric measures in RePEc. Moreover, we show how individual and aggregated rankings can be biased due to the employed ranking methodology. In order to select key indicators describing and assessing research performance of scientist, we propose to apply principal component analysis in this data-rich environment. This approach allows us to assign weights to each indicator prior to aggregation. We illustrate the approach by providing a new overall ranking of economists based on RePEc data. (C) 2012 Elsevier Ltd. All rights reserved. C1 [Seiler, Christian; Wohlrabe, Klaus] Ifo Inst Econ Res, D-81679 Munich, Germany. RP Wohlrabe, K (reprint author), Ifo Inst Econ Res, Poschingerstr 5, D-81679 Munich, Germany. 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PD JUL PY 2012 VL 6 IS 3 BP 389 EP 402 DI 10.1016/j.joi.2012.01.007 PG 14 WC Information Science & Library Science SC Information Science & Library Science GA 937LN UT WOS:000303660100005 ER PT J AU Li, DF Ding, Y Shuai, X Bollen, J Tang, J Chen, SS Zhu, JY Rocha, G AF Li, Daifeng Ding, Ying Shuai, Xin Bollen, Johan Tang, Jie Chen, Shanshan Zhu, Jiayi Rocha, Guilherme TI Adding community and dynamic to topic models SO JOURNAL OF INFORMETRICS LA English DT Article DE Social network; Semantic community; Topic mining; Dynamic ID NETWORKS AB The detection of communities in large social networks is receiving increasing attention in a variety of research areas. Most existing community detection approaches focus on the topology of social connections (e.g., coauthor, citation, and social conversation) without considering their topic and dynamic features. In this paper, we propose two models to detect communities by considering both topic and dynamic features. First, the Community Topic Model (CTM) can identify communities sharing similar topics. Second, the Dynamic CTM (DCTM) can capture the dynamic features of communities and topics based on the Bernoulli distribution that leverages the temporal continuity between consecutive timestamps. Both models were tested on two datasets: ArnetMiner and Twitter. Experiments show that communities with similar topics can be detected and the co-evolution of communities and topics can be observed by these two models, which allow us to better understand the dynamic features of social networks and make improved personalized recommendations. (C) 2011 Elsevier Ltd. All rights reserved. C1 [Shuai, Xin; Bollen, Johan; Zhu, Jiayi] Indiana Univ, Sch Informat & Comp, Bloomington, IN 47408 USA. [Li, Daifeng; Tang, Jie] Tsinghua Univ, Dept Comp Sci & Technol, Beijing 100084, Peoples R China. [Ding, Ying; Chen, Shanshan] Indiana Univ, Sch Lib & Informat Sci, Bloomington, IN 47408 USA. 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Informetr. PD APR PY 2012 VL 6 IS 2 BP 237 EP 253 DI 10.1016/j.joi.2011.11.004 PG 17 WC Information Science & Library Science SC Information Science & Library Science GA 906RF UT WOS:000301364100008 ER PT J AU Sarabia, JM Prieto, F Trueba, C AF Maria Sarabia, Jose Prieto, Faustino Trueba, Carmen TI Modeling the probabilistic distribution of the impact factor SO JOURNAL OF INFORMETRICS LA English DT Article DE Impact factor; Quantile function; Moments; Lorenz andLeimkuhler curves; Gini index; Least squares estimates ID LORENZ CURVES; EGGHES CONSTRUCTION; GENERAL DEFINITION; LEIMKUHLER CURVE; FAMILY AB The study of the informetric distributions, such as distributions of citations and impact factors is one of the most relevant topics in the current informetric research. Several laws for modeling impact factor based on ranks have been proposed, including Zipf, Lavalette and the two-exponent law proposed by Mansilla et al. (2007). 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PD JAN PY 2012 VL 6 IS 1 BP 66 EP 79 DI 10.1016/j.joi.2011.09.005 PG 14 WC Information Science & Library Science SC Information Science & Library Science GA 865QL UT WOS:000298325300010 ER PT J AU Nair, GM Turlach, BA AF Nair, Gopalan M. Turlach, Berwin A. TI The stochastic h-index SO JOURNAL OF INFORMETRICS LA English DT Article DE h-Index; Stochastic h-index; Rational h-index; Real h-index; Bibliometric indicators; Stochastic model ID HIRSCH-INDEX; PROPOSAL AB A variant of the h-index, named the stochastic h-index, is proposed. This new index is obtained by adding to the h-index the probability, under a specific stochastic model, that the h-index will increase by one or more within a given time interval. The stochastic h-index thus extends the h-index to the real line and has a direct interpretation as the distance to the next higher index value. We show how the stochastic h-index can be evaluated and compare it with other variants of the h-index which purportedly indicate the distance to a higher h-index. (C) 2011 Elsevier Ltd. All rights reserved. C1 [Nair, Gopalan M.] Univ Western Australia, Sch Math & Stat M019, Crawley, WA 6009, Australia. [Turlach, Berwin A.] Univ Western Australia, Ctr Appl Stat M019, Crawley, WA 6009, Australia. RP Turlach, BA (reprint author), Univ Western Australia, Sch Math & Stat M019, 35 Stirling Highway, Crawley, WA 6009, Australia. EM Gopalan.Nair@uwa.edu.au; Berwin.Turlach@gmail.com RI Turlach, Berwin/A-4995-2008 OI Turlach, Berwin/0000-0001-8795-471X CR Alonso S, 2009, J INFORMETR, V3, P273, DOI 10.1016/j.joi.2009.04.001 Burrell QL, 2007, SCIENTOMETRICS, V73, P19, DOI 10.1007/s11192-006-1774-5 Burrell QL, 2007, J INFORMETR, V1, P16, DOI 10.1016/j.joi.2006.07.001 Burrell QL, 2009, J AM SOC INF SCI TEC, V60, P418, DOI 10.1002/asi.20969 Burrell Q. L., 2002, Journal of the American Society for Information Science and Technology, V53, DOI 10.1002/asi.10031 Casella G, 2002, STAT INFERENCE Egghe L, 2010, ANNU REV INFORM SCI, V44, P65 Egghe L, 2006, SCIENTOMETRICS, V69, P131, DOI 10.1007/s11192-006-0144-7 Egghe L., 2006, ISSI NEWSLETTER, V2, P8 Gagolewski M, 2009, SCIENTOMETRICS, V81, P617, DOI 10.1007/s11192-008-2253-y Guns R, 2009, J INFORMETR, V3, P64, DOI 10.1016/j.joi.2008.11.004 Hirsch JE, 2007, P NATL ACAD SCI USA, V104, P19193, DOI 10.1073/pnas.0707962104 Hirsch JE, 2005, P NATL ACAD SCI USA, V102, P16569, DOI 10.1073/pnas.0507655102 Hyndman RJ, 2008, SPRINGER SER STAT, P3 Mukhopadhyay N., 2006, STAT TXB MONOGRAPHS, V187 Rousseau R., 2008, P WIS 2008 BERL 4 IN, P1 Rousseau R., 2006, ID6153 LIS Rousseau R, 2008, J AM SOC INF SCI TEC, V59, P1853, DOI 10.1002/asi.20890 Ruane F, 2008, SCIENTOMETRICS, V75, P395, DOI 10.1007/s11192-007-1869-7 Woeginger GJ, 2008, MATH SOC SCI, V56, P224, DOI 10.1016/j.mathsocsci.2008.03.001 NR 20 TC 4 Z9 4 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 1751-1577 J9 J INFORMETR JI J. Informetr. PD JAN PY 2012 VL 6 IS 1 BP 80 EP 87 DI 10.1016/j.joi.2011.09.006 PG 8 WC Information Science & Library Science SC Information Science & Library Science GA 865QL UT WOS:000298325300011 ER PT J AU Zhang, L Glanzel, W AF Zhang, Lin Glanzel, Wolfgang TI Proceeding papers in journals versus the "regular" journal publications SO JOURNAL OF INFORMETRICS LA English DT Article DE Proceeding papers; Articles; Citation impact ID SCIENTIFIC COMMUNICATION; BIBLIOMETRIC ANALYSIS; CITATION ANALYSIS; INFORMATION; IMPACT; INSTITUTE; ARTICLES; PATTERNS AB In the present paper we proceed from recent results by Gonzalez-Albo and Bordons (2011) obtained from studying the role and impact of proceedings literature in LIS journals. We extend the research to all fields of the sciences and social sciences and address additional research questions concerning publication frequency and citation impact as well as their differences in individual journals and subject fields. (C) 2011 Elsevier Ltd. All rights reserved. C1 [Zhang, Lin; Glanzel, Wolfgang] Katholieke Univ Leuven, ECOOM & MSI, Louvain, Belgium. [Zhang, Lin] N China Univ Water Conservancy & Elect Power, Dept Management & Econ, Zhengzhou, Peoples R China. [Glanzel, Wolfgang] Hungarian Acad Sci, Inst Res Policy Studies, Budapest, Hungary. RP Zhang, L (reprint author), Katholieke Univ Leuven, ECOOM & MSI, Louvain, Belgium. EM linzhang1117@gmail.com RI Glanzel, Wolfgang/A-6280-2008 OI Glanzel, Wolfgang/0000-0001-7529-5198 CR Aleixandre-Benavent R, 2009, SCIENTOMETRICS, V80, P407, DOI 10.1007/s11192-008-2066-z Bar-Ilan J, 2010, SCIENTOMETRICS, V83, P809, DOI 10.1007/s11192-009-0145-4 BRAUN T, 1989, SCIENTOMETRICS, V15, P325, DOI 10.1007/BF02017057 Butler L, 2006, SCIENTOMETRICS, V66, P327, DOI 10.1007/s11192-006-0024-1 Butler L, 2008, SCIENTOMETRICS, V74, P39, DOI 10.1007/s11192-008-0102-7 DROTT MC, 1995, J AM SOC INFORM SCI, V46, P299, DOI 10.1002/(SICI)1097-4571(199505)46:4<299::AID-ASI6>3.0.CO;2-0 Frohlich C, 2001, J AM SOC INF SCI TEC, V52, P701, DOI 10.1002/asi.1121 GARVEY WD, 1972, INFORM STORAGE RET, V8, P159, DOI 10.1016/0020-0271(72)90001-0 GARVEY WD, 1972, INFORM STORAGE RET, V8, P207, DOI 10.1016/0020-0271(72)90031-9 GARVEY WD, 1972, SCI STUD, V2, P379, DOI 10.1177/030631277200200406 Glanzel W, 2002, SCIENTOMETRICS, V53, P171, DOI 10.1023/A:1014848323806 Glanzel W, 2006, SCIENTOMETRICS, V68, P457, DOI 10.1007/s11192-006-0124-y Gonzalez-Albo B, 2011, J INFORMETR, V5, P369, DOI 10.1016/j.joi.2011.01.011 Goodrum AA, 2001, INFORM PROCESS MANAG, V37, P661, DOI 10.1016/S0306-4573(00)00047-9 Lisee C, 2008, J AM SOC INF SCI TEC, V59, P1776, DOI 10.1002/asi.20888 Miguel-Dasit A, 2006, SCIENTOMETRICS, V66, P467, DOI 10.1007/s11192-006-0045-9 MOED HF, 1995, J AM SOC INFORM SCI, V46, P461, DOI 10.1002/(SICI)1097-4571(199507)46:6<461::AID-ASI5>3.0.CO;2-G Montesi M, 2008, J AM SOC INF SCI TEC, V59, P816, DOI 10.1002/asi.20805 Zhang L., 2011, ISSI NEWSLETTER, V7, P31 NR 19 TC 4 Z9 4 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 1751-1577 J9 J INFORMETR JI J. Informetr. PD JAN PY 2012 VL 6 IS 1 BP 88 EP 96 DI 10.1016/j.joi.2011.06.007 PG 9 WC Information Science & Library Science SC Information Science & Library Science GA 865QL UT WOS:000298325300012 ER PT J AU Sangwal, K AF Sangwal, Keshra TI Progressive nucleation mechanism and its application to the growth of journals, articles and authors in scientific fields SO JOURNAL OF INFORMETRICS LA English DT Article DE Growth behavior of items; Power-law relation; Progressive nucleation mechanism; Saturation of item/field AB The basic concepts of progressive nucleation mechanism are described and the final equations of the mechanism are used to analyze the growth of articles in three randomly selected databases from 20 different databases in humanities (philosopher's index, set 1), social sciences (exceptional child education, set 5) and science and technology (food science and technology, set 10), respectively, covering the period 1968-1987, previously analyzed by Egghe and Ravichandra Rao (1992, Scientometrics 25 (1), 5-46), and the growth of journals, articles and authors in malaria research for the period 1955-2005, reported recently by Ravichandra Rao and Srivastava (2010, Journal of Informetrics 4 (1), 249-256) and compared with the predictions of the power-law equation. Analysis of the former data revealed that: (1) the progressive nucleation mechanism describes the data better than the power-law relation, (2) the field of social sciences is saturated much earlier than science and technology but publication activity in humanities is saturated much later, and (3) that social sciences have the maximum growth, followed by lower growth in humanities and the lowest growth in science and technology. The data on journals J(t), papers N(t) and authors W(t) against publication year Y in malaria research can be described equally well by equations of the power-law and progressive nucleation mechanism, and the growth of journals J(t) and articles N(t) is intimately connected with the growth of authors W(t). (C) 2011 Elsevier Ltd. All rights reserved. C1 Lublin Univ Technol, Dept Appl Phys, PL-20618 Lublin, Poland. RP Sangwal, K (reprint author), Lublin Univ Technol, Dept Appl Phys, Ul Nadbystrzycka 38, PL-20618 Lublin, Poland. EM k.sangwal@pollub.pl CR EGGHE L, 1992, SCIENTOMETRICS, V25, P5, DOI 10.1007/BF02016845 Gupta BM, 2002, SCIENTOMETRICS, V53, P161, DOI 10.1023/A:1014844222898 Kashchiev D, 2000, NUCLEATION BASIC THE Price D.J.D.S., 1963, LITTLE SCI BIG SCI Rao IKR, 2010, J INFORMETR, V4, P249, DOI 10.1016/j.joi.2009.12.003 Sangwal K, 2011, J INFORMETR, V5, P554, DOI 10.1016/j.joi.2011.04.007 Wolfram G., 1989, P 2 INT C BIBL SCIEN, P355 Wong CY, 2010, J INFORMETR, V4, P460, DOI 10.1016/j.joi.2010.04.002 NR 8 TC 4 Z9 4 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 1751-1577 J9 J INFORMETR JI J. Informetr. PD OCT PY 2011 VL 5 IS 4 BP 529 EP 536 DI 10.1016/j.joi.2011.04.005 PG 8 WC Information Science & Library Science SC Information Science & Library Science GA 841PI UT WOS:000296524200004 ER PT J AU Sicilia, MA Sanchez-Alonso, S Garcia-Barriocanal, E AF Sicilia, Miguel-Angel Sanchez-Alonso, Salvador Garcia-Barriocanal, Elena TI Comparing impact factors from two different citation databases: The case of Computer Science SO JOURNAL OF INFORMETRICS LA English DT Article DE Impact factor; Citation database; Journal Citation Reports (JCR); Scimago Journal Rank (SJR); Research outcome evaluation ID WEB-OF-SCIENCE; JOURNAL IMPACT; SCOPUS AB Journal impact factors continue to play an important role in research output assessment, in spite of the criticisms and debates around them. The impact factor rankings provided in the Journal Citation Reports (JCR (TM)) database by Thompson Reuters have enjoyed a position of monopoly for many years. But this has recently changed with the availability of the Scopus (TM) database and its associated journal ranking published in the Scimago Journal Rank (SJR) Web page, as the former provides a citation database with similar inclusion criteria to those used in the JCR and the latter and openly accessible impact factor-based ranking. The availability of alternatives to the JCR impact factor listings using a different citation database raises the question of the extent to which the two rankings can be considered equally valid for research evaluation purposes. This paper reports the results of a contrast of both listings in Computer Science-related topics. It attempts to answer the validity question by comparing the impact factors of journals ranked in both listings and their relative position. The results show that impact factors for journals included in both rankings are strongly correlated, with SJR impact factors in general slightly higher, confirming previous studies related to other disciplines. Nonetheless, the consideration of tercile and quartile position of journal yields some divergences for journals appearing in both rankings that need to be accounted for in research evaluation procedures. (C) 2011 Elsevier Ltd. All rights reserved. C1 [Sicilia, Miguel-Angel; Sanchez-Alonso, Salvador; Garcia-Barriocanal, Elena] Univ Alcala De Henares, Dept Comp Sci, Alcala De Henares 28871, Madrid, Spain. RP Sicilia, MA (reprint author), Univ Alcala De Henares, Dept Comp Sci, Polytech Bldg,Ctra Barcelona Km 33-6, Alcala De Henares 28871, Madrid, Spain. EM msicilia@uah.es RI Sicilia, Miguel Angel /F-5002-2012; Sanchez-Alonso, Salvador/M-2950-2014 OI Sanchez-Alonso, Salvador/0000-0002-9949-4797 CR Bollen J, 2005, INFORM PROCESS MANAG, V41, P1419, DOI 10.1016/j.ipm.2005.03.024 Bouyssou D, 2011, J INFORMETR, V5, P75, DOI 10.1016/j.joi.2010.09.001 BUHRINGER G, 2006, DESCRIPTION J SELECT Butler D, 2008, NATURE, V451, P6, DOI 10.1038/451006a Butler L, 2008, SCIENTOMETRICS, V74, P39, DOI 10.1007/s11192-008-0102-7 COYLE L, 2008, UCDCSI20088 Franceschet M, 2011, INFORM PROCESS MANAG, V47, P117, DOI 10.1016/j.ipm.2010.03.003 Garfield E, 2006, JAMA-J AM MED ASSOC, V295, P90, DOI 10.1001/jama.295.1.90 GARFIELD E, 1955, SCIENCE, V122, P108, DOI 10.1126/science.122.3159.108 Gonzalez-Pereira B, 2010, J INFORMETR, V4, P379, DOI 10.1016/j.joi.2010.03.002 Habibzadeh F, 2008, J INFORMETR, V2, P164, DOI 10.1016/j.joi.2008.02.001 Jacso P, 2005, CURR SCI INDIA, V89, P1537 Kimura ET, 2008, ARQ BRAS ENDOCRINOL, V52, P925, DOI 10.1590/S0004-27302008000600001 Leydesdorff L, 2009, J AM SOC INF SCI TEC, V60, P348, DOI 10.1002/asi.20967 Lopez-Illescas C, 2008, J INFORMETR, V2, P304, DOI 10.1016/j.joi.2008.08.001 Mallig N, 2010, J INFORMETR, V4, P564, DOI 10.1016/j.joi.2010.06.007 Opthof T, 1997, CARDIOVASC RES, V33, P1, DOI 10.1016/S0008-6363(96)00215-5 Schopfel J, 2009, PSYCHOL FR, V54, P287, DOI 10.1016/j.psfr.2009.07.002 *SCIMAGO, 2007, DESCR SCIMAGO J RANK Serenko A, 2010, J INFORMETR, V4, P447, DOI 10.1016/j.joi.2010.04.001 Togia A., 2006, INT J EDUC RES, V45, P362, DOI DOI 10.1016/J.IJER.2007.02.001 NR 21 TC 4 Z9 4 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 1751-1577 J9 J INFORMETR JI J. Informetr. PD OCT PY 2011 VL 5 IS 4 BP 698 EP 704 DI 10.1016/j.joi.2011.01.007 PG 7 WC Information Science & Library Science SC Information Science & Library Science GA 841PI UT WOS:000296524200021 ER PT J AU Egghe, L Bornmann, L Guns, R AF Egghe, L. Bornmann, L. Guns, R. TI A proposal for a First-Citation-Speed-Index SO JOURNAL OF INFORMETRICS LA English DT Article DE First-Citation-Speed-Index; FCSI; h-Index; Increasing sequence AB In this paper, we define a First-Citation-Speed-Index (FCSI) for a set of papers, based on their times of publication and of first citation. The index is based on the definition of a h-index for increasing sequences. We show that the index has several good properties in the sense that the shorter the times are between publication and first citation (in a global manner) the higher the FCSI is. We present two case studies: a first-citation speed comparison of three journals in the field of psychology and a first-citation speed comparison of accepted and rejected, but published elsewhere manuscripts by the journal Angewandte Chemie International Edition. Both case studies indicate that our FCSI satisfies the intuitive feeling of what values a FCSI should have in these cases. (C) 2010 Elsevier Ltd. All rights reserved. C1 [Egghe, L.] Univ Hasselt, B-3590 Diepenbeek, Belgium. [Egghe, L.; Guns, R.] Univ Antwerp, B-2000 Antwerp, Belgium. [Bornmann, L.] Max Planck Soc, D-80539 Munich, Germany. RP Egghe, L (reprint author), Univ Hasselt, Campus Diepenbeek,Agoralaan, B-3590 Diepenbeek, Belgium. EM leo.egghe@uhasselt.be; bornmann@gv.mpg.de; raf.guns@ua.ac.be RI Guns, Raf/D-6762-2012; Bornmann, Lutz/A-3926-2008 OI Guns, Raf/0000-0003-3129-0330; Bornmann, Lutz/0000-0003-0810-7091 CR Bornmann L, 2010, J INFORMETR, V4, P83, DOI 10.1016/j.joi.2009.09.001 EGGHE L, 2010, ANNU REV INFORM SCI, P65 EGGHE L, SCIENTOMETR IN PRESS Egghe L, 2005, LIBR INFORM SCI SER, P1 Hirsch JE, 2005, P NATL ACAD SCI USA, V102, P16569, DOI 10.1073/pnas.0507655102 SCHUBERT A, 1986, CZECH J PHYS, V36, P121, DOI 10.1007/BF01599743 NR 6 TC 4 Z9 4 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 1751-1577 J9 J INFORMETR JI J. Informetr. PD JAN PY 2011 VL 5 IS 1 BP 181 EP 186 DI 10.1016/j.joi.2010.10.006 PG 6 WC Information Science & Library Science SC Information Science & Library Science GA 698WS UT WOS:000285626000014 ER PT J AU Sarabia, JM Gomez-Deniz, E Sarabia, M Prieto, F AF Maria Sarabia, Jose Gomez-Deniz, Emilio Sarabia, Maria Prieto, Faustino TI A general method for generating parametric Lorenz and Leimkuhler curves SO JOURNAL OF INFORMETRICS LA English DT Article DE Productivity; Cumulative distribution function; Probability generating function; Gini index ID FUNCTIONAL FORM; BRADFORD DISTRIBUTION; SCIENTIFIC PRODUCTIVITY; LOTKAS LAW; DISTRIBUTIONS; FAMILY; ZIPF; CONSTRUCTION; DEFINITION; SYMMETRY AB Let L-0 consider an initial Lorenz curve. In this paper we propose a general methodology for obtaining new classes of parametric Lorenz or Leimkuhler curves that contain the original curve as limiting or special case. The new classes introduce additional parameters in the original family, providing more flexibility for the new families. The new classes are built from an ordered sequence of power Lorenz curves, assuming that the powers are distributed according to some convenient discrete random variable. Using this method we obtain many of the families proposed in the literature, including the classical proposal of Bradford (1934), Kakwani and Podder (1973) and others. We obtain some inequality measures and population functions for the proposed families. (C) 2010 Elsevier Ltd. All rights reserved. C1 [Maria Sarabia, Jose; Prieto, Faustino] Univ Cantabria, Dept Econ, E-39005 Santander, Spain. [Gomez-Deniz, Emilio] Univ Las Palmas Gran Canaria, Dept Quantitat Methods, Las Palmas Gran Canaria, Spain. [Sarabia, Maria] Univ Cantabria, Dept Business Adm, E-39005 Santander, Spain. RP Sarabia, JM (reprint author), Univ Cantabria, Dept Econ, E-39005 Santander, Spain. 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Informetr. PD OCT PY 2010 VL 4 IS 4 BP 524 EP 539 DI 10.1016/j.joi.2010.06.002 PG 16 WC Information Science & Library Science SC Information Science & Library Science GA 647KA UT WOS:000281616200008 ER PT J AU Egghe, L AF Egghe, L. TI Conjugate partitions in informetrics: Lorenz curves, h-type indices, Ferrers graphs and Durfee squares in a discrete and continuous setting SO JOURNAL OF INFORMETRICS LA English DT Article DE Conjugate partition; Informetrics; Lorenz curve; h-index; g-index; R-index; Ferrers graph; Durfee square ID R-INDEX AB The well-known discrete theory of conjugate partitions, Ferrers graphs and Durfee squares is interpreted in informetrics. It is shown that partitions and their conjugates have the same h-index, a fact that is not true for the g- and R-index. A modification of Ferrers graph is presented, yielding the g-index. We then present a formula for the Lorenz curve of the conjugate partition in function of the Lorenz curve of the original partition in the discrete setting. Ferrers graphs, Durfee squares and conjugate partitions are then defined in the continuous setting where variables range over intervals. Conjugate partitions are nothing else than the inverses of rank-frequency functions in informetrics. Also here they have the same h-index and we can again give a formula for the Lorenz curve of the conjugate partition in function of the Lorenz curve of the original partition. Calculatory examples are given where these Lorenz curves are equal and where one Lorenz curve dominates the other one. We also prove that the Lorenz curve of a partition and the one of its conjugate can intersect on the open interval ]0, 1[. (C) 2010 Elsevier Ltd. All rights reserved. C1 Univ Hasselt, B-3590 Diepenbeek, Belgium. RP Egghe, L (reprint author), Univ Hasselt, Campus Diepenbeek, B-3590 Diepenbeek, Belgium. EM leo.egghe@uhasselt.be CR Anderson TR, 2008, SCIENTOMETRICS, V76, P577, DOI 10.1007/s11192-007-2071-2 Andrews G. E., 1998, THEORY PARTITIONS Costas R, 2008, SCIENTOMETRICS, V77, P267, DOI 10.1007/s11192-007-1997-0 Egghe L, 2005, J AM SOC INF SCI TEC, V56, P935, DOI 10.1002/asi.20186 Egghe L, 2003, PROG NAT SCI, V13, P478, DOI 10.1080/10020070312331343880 Egghe L, 2006, SCIENTOMETRICS, V69, P131, DOI 10.1007/s11192-006-0144-7 Egghe L., 1990, INTRO INFORMETRICS Q Egghe L, 2005, LIBR INFORM SCI SER, P1 Egghe L, 2006, SCIENTOMETRICS, V69, P121, DOI 10.1007/s11192-006-0143-8 Jin BH, 2007, CHINESE SCI BULL, V52, P855, DOI 10.1007/s11434-007-0145-9 Schreiber M, 2008, J AM SOC INF SCI TEC, V59, P1513, DOI 10.1002/asi.20856 Schreiber M, 2008, SCIENTOMETRICS, V76, P187, DOI 10.1007/s11192-007-1886-6 Tol RSJ, 2008, J INFORMETR, V2, P149, DOI 10.1016/j.joi.2008.01.001 NR 13 TC 4 Z9 4 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 1751-1577 J9 J INFORMETR JI J. Informetr. PD JUL PY 2010 VL 4 IS 3 BP 320 EP 330 DI 10.1016/j.joi.2010.01.006 PG 11 WC Information Science & Library Science SC Information Science & Library Science GA 607YQ UT WOS:000278543600011 ER PT J AU Yu, LP Shen, XM Pan, YT Wu, YS AF Yu, Liping Shen, Xiaoming Pan, Yuntao Wu, Yishan TI Scholarly journal evaluation based on panel data analysis SO JOURNAL OF INFORMETRICS LA English DT Article DE Scholarly journal; MAE (Multiple Attribute Evaluation); Indicator selection; TOPSIS; Panel data analysis; Heuristic methods ID BIBLIOMETRIC TOOLS; SCIENCE POLICY; IMPACT; INDICATORS; PUBLICATIONS; PERFORMANCE; CITATIONS; OUTPUT; INDEX AB This paper proposes a new method for indicator selection in panel data analysis and tests the method with relevant data on agricultural journals provided by the Institute of Scientific & Technical Information of China. An evaluation exercise by the TOPSIS method is conducted as a comparison. The result shows that panel data analysis is an effective method for indicator selection in scholarly journal evaluation; journals of different disciplines should not be evaluated with the same criteria; it is beneficial to publish all the evaluation indicators; unavailability of a few indicators has a limited influence on evaluation results; simplifying indicators can reduce costs and increase efficiency as well as accuracy of journal evaluation. (C) 2009 Elsevier Ltd. All rights reserved. C1 [Yu, Liping; Pan, Yuntao; Wu, Yishan] Inst Sci & Tech Informat China, Beijing 100038, Peoples R China. [Shen, Xiaoming] Jiangsu Polytech Univ, Changzhou 213016, Peoples R China. RP Yu, LP (reprint author), Inst Sci & Tech Informat China, Beijing 100038, Peoples R China. 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PD OCT PY 2009 VL 3 IS 4 BP 312 EP 320 DI 10.1016/j.joi.2009.04.003 PG 9 WC Information Science & Library Science SC Information Science & Library Science GA 484VB UT WOS:000269075100005 ER PT J AU Frandsen, TF AF Frandsen, Tove Faber TI The effects of open access on un-published documents: A case study of economics working papers SO JOURNAL OF INFORMETRICS LA English DT Article DE Open access advantage; Working papers; Economics; Citation analysis; Grey literature ID CITATION IMPACT; GREY LITERATURE; BIBLIOMETRIC ANALYSIS; RESEARCH PERFORMANCE; SCIENCE LITERATURE; SOCIAL-SCIENCES; ARTICLES; COMMUNICATION; INFORMATION; HUMANITIES AB The use of scholarly publications that have not been formally published in e.g. journals is widespread in some fields. In the past they have been disseminated through various channels of informal communication. However, the Internet has enabled dissemination of these un-published and often unrefereed publications to a much wider audience. This is particularly interesting seen in relation to the highly disputed open access advantage as the potential advantage for low visibility publications has not been given much attention in the literature. The present study examines the role of working papers in economics during a 10-year period (1996-2005). It shows that working papers are increasingly becoming visible in the field specific databases. The impact of working papers is relatively low; however, high impact working paper series have citation rate levels similar to the low impact journals in the field. There is no tendency to an increase in impact during the 10 years which is the case for the high impact journals. Consequently, the result of this study does not provide evidence of an open access advantage for working papers in economics. (C) 2008 Elsevier Ltd. All rights reserved. C1 Royal Sch Lib & Informat Sci, DK-2300 Copenhagen S, Denmark. RP Frandsen, TF (reprint author), Royal Sch Lib & Informat Sci, Birketinget 6, DK-2300 Copenhagen S, Denmark. 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PD APR PY 2009 VL 3 IS 2 BP 124 EP 133 DI 10.1016/j.joi.2008.12.002 PG 10 WC Information Science & Library Science SC Information Science & Library Science GA 420VM UT WOS:000264317300003 ER PT J AU Rodriguez, V Janssens, F Debackere, K De Moor, B AF Rodriguez, Victor Janssens, Frizo Debackere, Koenraad De Moor, Bart TI On material transfer agreements and visibility of researchers in biotechnology SO JOURNAL OF INFORMETRICS LA English DT Article DE bibliometrics; research material; scientific reputation; h-index; biotechnology; material transfer agreement ID HIGHLY CITED PAPERS; BIBLIOMETRIC INDICATORS; CHEMISTRY RESEARCH; SCIENCE; CITATION; SCIENTISTS; INDEX; PUBLICATION; OUTPUT; NOBEL AB When carrying out a research project, some materials may not be available in-house. Thus, investigators resort to external providers for conducting their research. To that end, the exchange may be formalised through material transfer agreements. In this context, industry, government and academia have their own specific expectations regarding compensation for the help they provide when transferring the research material. This paper assesses whether these contracts might have had an impact on visibility of researchers. Visibility is thereby operationalised on the basis of a bibliometric approach. In the sample utilised, researchers that availed themselves of these contracts were more visible compared to those who did not use them, controlling for seniority and co-authorship. Nonetheless, providers and receivers could not be differentiated in terms of visibility but by research sector and co-authorship. Being a user of these contracts might, to some extent, be the reflection of systematic differences in the stratification of science based on visibility. (C) 2007 Elsevier Ltd. All rights reserved. C1 [Rodriguez, Victor; Debackere, Koenraad] Katholieke Univ Leuven, Dept Managerial Econ Strategy & Innovat, B-3000 Louvain, Belgium. [Janssens, Frizo; De Moor, Bart] Katholieke Univ Leuven, Dept Elect Engn, B-3001 Louvain, Belgium. RP Rodriguez, V (reprint author), Katholieke Univ Leuven, Dept Managerial Econ Strategy & Innovat, Naamsestr 69, B-3000 Louvain, Belgium. 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PY 2008 VL 2 IS 1 BP 89 EP 100 DI 10.1016/j.joi.2007.10.003 PG 12 WC Information Science & Library Science SC Information Science & Library Science GA 270LL UT WOS:000253722200005 ER PT J AU Liang, L Rousseau, R AF Liang, Liming Rousseau, Ronald TI Transformations of basic publication-citation matrices SO JOURNAL OF INFORMETRICS LA English DT Article DE basic publication-citation matrices; generalized impact factors; R-sequences; informetric transformations; invariants ID SCIENCE; IMPACT; RHYTHM AB Basic publication-citation matrices are used to calculate informetric indicators such as journal impact factors or R-sequences. Transforming these publication-citation matrices clarifies the construction of other indicators. In this article, some transformations are highlighted together with some of their invariants. Such invariants offer a rigorous mathematically founded way of comparing informetric matrices before and after a transformation. (c) 2007 Elsevier Ltd. All rights reserved. C1 [Liang, Liming; Rousseau, Ronald] Univ Antwerp, IBW, B-2600 Antwerp, Belgium. [Liang, Liming] Henan Normal Univ, Inst Sci Technol & Soc, Xinxiang 453007, Peoples R China. [Rousseau, Ronald] Assoc KU Leuven, KHBO, B-8400 Oostende, Belgium. RP Rousseau, R (reprint author), Univ Antwerp, IBW, Univ Pl 1, B-2600 Antwerp, Belgium. EM pllm@public.xxptt.ha.cn; ronald.rousseau@ua.ac.be CR Boyer C, 1989, HIST MATH Frandsen TF, 2005, J AM SOC INF SCI TEC, V56, P58, DOI 10.1002/asi.20100 Glanzel W, 2004, SCIENTOMETRICS, V59, P63 Ingwersen P, 2001, CHINESE SCI BULL, V46, P524 Jin BH, 1999, SCIENTOMETRICS, V45, P325, DOI 10.1007/BF02458440 LIANG L, 2005, P ISSI 2005, P398 Liang LM, 2006, SCIENTOMETRICS, V68, P535, DOI 10.1007/s11192-006-0128-7 Liang LM, 2005, J AM SOC INF SCI TEC, V56, P1045, DOI 10.1002/asi.20196 MOED HF, 1983, MEASUREMENT RES PERF Rousseau R, 2005, INFORM PROCESS MANAG, V41, P1360, DOI 10.1016/j.ipm.2005.03.007 Wu YS, 2004, SCIENTOMETRICS, V60, P385, DOI 10.1023/B:SCIE.0000034381.64865.2b NR 11 TC 4 Z9 5 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 1751-1577 J9 J INFORMETR JI J. Informetr. PD JUL PY 2007 VL 1 IS 3 BP 249 EP 255 DI 10.1016/j.joi.2007.01.004 PG 7 WC Information Science & Library Science SC Information Science & Library Science GA 272BE UT WOS:000253831700008 ER PT J AU Prabowo, R Thelwall, M Alexandrov, M AF Prabowo, Rudy Thelwall, M. Alexandrov, Mikhail TI Generating overview timelines for major events in an RSS corpus SO JOURNAL OF INFORMETRICS LA English DT Article DE feature selection; clustering; overview timeline AB Really simple syndication (RSS) is becoming a ubiquitous technology for notifying users of new content in frequently updated web sites, such as blogs and news portals. This paper describes a feature-based, local clustering approach for generating over-view timelines for major events, such as the tsunami tragedy, from a general-purpose corpus of RSS feeds. In order to identify significant events, we automatically (1) selected a set of significant terms for each day; (2) built a set of (term-co-term) pairs and (3) clustered the pairs in an attempt to group contextually related terms. The clusters were assessed by 10 people, finding that the average percentage apparently representing significant events was 68.6%. Using these clusters, we generated overview timelines for three major events: the tsunami tragedy, the US election and bird flu. The results indicate that our approach is effective in identifying predominantly genuine events, but can only produce partial timelines. (c) 2007 Elsevier Ltd. All rights reserved. C1 [Prabowo, Rudy; Thelwall, M.] Wolverhampton Univ, Sch Comp & Informat Technol, Wolverhampton WV1 1SB, England. [Alexandrov, Mikhail] Autonomous Univ Barcelona, Barcelona, Spain. RP Prabowo, R (reprint author), Wolverhampton Univ, Sch Comp & Informat Technol, Wulfruna St, Wolverhampton WV1 1SB, England. EM Rudy.Prabowo@wlv.ac.uk; Mike.Thelwall@wlv.ac.uk; dyner1950@mail.ru RI Thelwall, Mike/C-1449-2013 OI Thelwall, Mike/0000-0001-6065-205X CR ADAR E, 2004, P 13 INT WWW C WORKS ALEXANDROV M, 2005, P 10 INT C APPL NAT, P275 Allan J., 1998, Proceedings of the 21st Annual International ACM SIGIR Conference on Research and Development in Information Retrieval, DOI 10.1145/290941.290954 Allan J., 1998, P DARPA BROADC NEWS Baeza-Yates R, 1999, MODERN INFORM RETRIE Belew R.K., 2000, FINDING OUT COGNITIV Brill Eric, 1992, P 3 C APPL NAT LANG, P152, DOI 10.3115/974499.974526 COHEN J, 1960, EDUC PSYCHOL MEAS, V20, P37, DOI 10.1177/001316446002000104 Eugenio B.D., 2004, COMPUTATIONAL LINGUI, V30, P95, DOI 10.1162/089120104773633402 GLANCE NS, 2004, P 13 INT WWW C WORKS Gruhl D., 2004, P 13 INT C WORLD WID, P491, DOI DOI 10.1145/988672.988739 Herring SC, 2004, P 37 HAW INT C SYST LIN J, 2004, P 13 INT WWW C WORKS MacKay D. J. 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TI Measuring quality of similarity functions in approximate data matching SO JOURNAL OF INFORMETRICS LA English DT Article DE approximate data matching; similarity functions; retrieval evaluation AB This paper presents a method for assessing the quality of similarity functions. The scenario taken into account is that of approximate data matching, in which it is necessary to determine whether two data instances represent the same real world object. Our method is based on the semi-automatic estimation of optimal threshold values. We propose two methods for performing such estimation. The first method is an algorithm based on a reward function, and the second is a statistical method. Experiments were carried out to validate the techniques proposed. The results show that both methods for threshold estimation produce similar results. The output of such methods was used to design a grading function for similarity functions. This grading function, called discernability, was used to compare a number of similarity functions applied to an experimental data set. (c) 2006 Elsevier Ltd. All rights reserved. C1 [da Silva, Roberto; Stasiu, Raquel; Orengo, Viviane Moreira; Heuser, Carlos A.] Inst Informat, UFRGS, Porto Alegre, RS, Brazil. RP da Silva, R (reprint author), Inst Informat, UFRGS, Porto Alegre, RS, Brazil. EM rdasilva@inf.ufrgs.br; rkstasiu@inf.ufrgs.br; vmorengo@inf.ufrgs.br; heuser@inf.ufrgs.br CR Bilenko M, 2003, IEEE INTELL SYST, V18, P16, DOI 10.1109/MIS.2003.1234765 Cohen W. W., 2003, P IJCAI 03 WORKSH IN, P73 DORNELES CF, 2004, WIDM 04 P 6 ANN ACM, P56 GUTH GJA, 1976, HIST METH NEWSLETT, V10, P10 Hall P. A. V., 1980, ACM COMPUT SURV, V12, P381, DOI 10.1145/356827.356830 Jaccard P, 1912, NEW PHYTOL, V11, P37, DOI DOI 10.1111/J.1469-8137.1912.TB05611.X JARO MA, 1989, J AM STAT SOC, V64, P1183 Levenshtein V. 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PD JAN PY 2007 VL 1 IS 1 BP 35 EP 46 DI 10.1016/j.joi.2006.09.001 PG 12 WC Information Science & Library Science SC Information Science & Library Science GA 274AN UT WOS:000253974300006 ER PT J AU Bouyssou, D Marchant, T AF Bouyssou, Denis Marchant, Thierry TI An axiomatic approach to bibliometric rankings and indices SO JOURNAL OF INFORMETRICS LA English DT Article DE Bibliometric ranking; Bibliometric index; h-Index; g-Index; Axiomatization ID SCIENTIFIC IMPACT INDEXES; EGGHES G-INDEX; H-INDEX; HIRSCH-INDEX; SCHOLARLY INFLUENCE; INDICATOR; VARIANTS; VALIDATION; FAMILY; OUTPUT AB This paper analyzes several well-known bibliometric indices using an axiomatic approach. We concentrate on indices aiming at capturing the global impact of a scientific output and do not investigate indices aiming at capturing an average impact. Hence, the indices that we study are designed to evaluate authors or groups of authors but not journals. The bibliometric indices that are studied include classic ones such as the number of highly cited papers as well as more recent ones such as the h-index and the g-index. We give conditions that characterize these indices, up to the multiplication by a positive constant. We also study the bibliometric rankings that are induced by these indices. Hence, we provide a general framework for the comparison of bibliometric rankings and indices. (C) 2014 Elsevier Ltd. All rights reserved. C1 [Bouyssou, Denis] CNRS, UMR 7243, LAMSADE, F-75775 Paris 16, France. [Bouyssou, Denis] Univ Paris 09, F-75775 Paris 16, France. [Marchant, Thierry] Univ Ghent, Dept Data Anal, B-9000 Ghent, Belgium. RP Bouyssou, D (reprint author), CNRS, UMR 7243, LAMSADE, Pl Marechal de Lattre de Tassigny, F-75775 Paris 16, France. EM bouyssou@lamsade.dauphine.fr; thierry.marchant@UGent.be CR Albarran P, 2011, J INFORMETR, V5, P122, DOI 10.1016/j.joi.2010.10.001 Albarran P., 2011, JOURNAL OF INFORMETR, V6, P515 Alonso S, 2009, J INFORMETR, V3, P273, DOI 10.1016/j.joi.2009.04.001 Bazen S, 2012, SOC CHOICE WELFARE, V39, P207, DOI 10.1007/s00355-011-0551-4 Bornmann L, 2008, J AM SOC INF SCI TEC, V59, P830, DOI 10.1002/asi.20806 Bornmann L, 2013, J INFORMETR, V7, P286, DOI 10.1016/j.joi.2012.12.003 Bornmann L., 2011, JOURNAL OF INFORMETR, V5, P348 Bornmann L, 2009, RES EVALUAT, V18, P185, DOI 10.3152/095820209X466883 Bouyssou D, 2011, J AM SOC INF SCI TEC, V62, P1761, DOI 10.1002/asi.21544 Bouyssou D, 2010, J INFORMETR, V4, P365, DOI 10.1016/j.joi.2010.03.003 Chambers CP, 2014, J ECON THEORY, V151, P571, DOI 10.1016/j.jet.2014.01.001 Chapron G, 2006, BIOSCIENCE, V56, P558, DOI 10.1641/0006-3568(2006)56[558:OFAFJR]2.0.CO;2 Deineko VG, 2009, SCIENTOMETRICS, V80, P819, DOI 10.1007/s11192-009-2130-0 Egghe L, 2012, INFORMATION PROCESSI, V45, P484 Egghe L, 2010, J INFORMETR, V4, P320, DOI 10.1016/j.joi.2010.01.006 Egghe L, 2010, ANNU REV INFORM SCI, V44, P65 Egghe L, 2006, SCIENTOMETRICS, V69, P131, DOI 10.1007/s11192-006-0144-7 Egghe L, 2013, J INFORMETR, V7, P388, DOI 10.1016/j.joi.2013.01.005 Eto H, 2003, SCIENTOMETRICS, V58, P5, DOI 10.1023/A:1025423406643 Franceschini F, 2010, EUR J OPER RES, V203, P494, DOI 10.1016/j.ejor.2009.08.001 Gagolewski M, 2009, SCIENTOMETRICS, V81, P617, DOI 10.1007/s11192-008-2253-y Glanzel W, 2013, SCIENTOMETRICS, V96, P381, DOI 10.1007/s11192-012-0898-z Hirsch JE, 2005, P NATL ACAD SCI USA, V102, P16569, DOI 10.1073/pnas.0507655102 Hwang YA, 2013, APPL MATH INFORM SCI, V7, P1317 Kosmulski M, 2013, J INFORMETR, V7, P313, DOI 10.1016/j.joi.2012.12.002 Liu Y, 2013, SCIENTOMETRICS, V96, P605, DOI 10.1007/s11192-012-0916-1 Marchant T., 2009, SCIENTOMETRICS, V80, P327 Marchant T, 2009, J AM SOC INF SCI TEC, V60, P1132, DOI 10.1002/asi.21059 Marshall AW, 2011, SPRINGER SER STAT, P3, DOI 10.1007/978-0-387-68276-1 Miroiu A, 2013, J INFORMETR, V7, P10, DOI 10.1016/j.joi.2012.08.003 Norris M, 2010, J DOC, V66, P681, DOI 10.1108/00220411011066790 Perny P, 2006, ANN OPER RES, V147, P317, DOI 10.1007/s10479-006-0073-0 Quesada A, 2011, J INFORMETR, V5, P476, DOI 10.1016/j.joi.2011.01.009 Quesada A, 2010, SCIENTOMETRICS, V82, P413, DOI 10.1007/s11192-009-0026-x Quesada A, 2011, SCIENTOMETRICS, V87, P107, DOI 10.1007/s11192-010-0307-4 Quesada A, 2009, J INFORMETR, V3, P158, DOI 10.1016/j.joi.2009.01.002 Ravallion M, 2011, SCIENTOMETRICS, V88, P321, DOI 10.1007/s11192-011-0375-0 Rousseau R, 2013, J INFORMETR, V7, P294, DOI 10.1016/j.joi.2012.11.012 Rousseau R, 2008, J INFORMETR, V2, P335, DOI 10.1016/j.joi.2008.07.001 Schreiber M, 2013, J INFORMETR, V7, P379, DOI 10.1016/j.joi.2012.12.006 Schreiber M., 2013, JOURNAL OF THE AMERI, V84, P12982 Schreiber M, 2011, RES EVALUAT, V20, P397, DOI 10.3152/095820211X13176484436131 SHORROCKS AF, 1983, ECONOMICA, V50, P3, DOI 10.2307/2554117 Stremlo E., 2012, MEASUREMENT INTERDIS, V10, P123 van A. 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PD JUL PY 2014 VL 8 IS 3 BP 449 EP 477 DI 10.1016/j.joi.2014.03.001 PG 29 WC Information Science & Library Science SC Information Science & Library Science GA AO5IE UT WOS:000341376700001 ER PT J AU Schreiber, M AF Schreiber, Michael TI Examples for counterintuitive behavior of the new citation-rank indicator P100 for bibliometric evaluations SO JOURNAL OF INFORMETRICS LA English DT Article DE Evaluation; Citation analysis; Highly cited publications; Bibliometric rankings; Percentiles ID PERCENTILES AB A new percentile-based rating scale P100 has recently been proposed to describe the citation impact in terms of the distribution of the unique citation values. Here I investigate P100 for 5 example datasets, two simple fictitious models and three larger empirical samples. Counterintuitive behavior is demonstrated in the model datasets, pointing to difficulties when the evolution with time of the indicator is analyzed or when different fields or publication years are compared. It is shown that similar problems can occur for the three larger datasets of empirical citation values. Further, it is observed that the performance evaluation result in terms of percentiles can be influenced by selecting different journals for publication of a manuscript. (C) 2014 Elsevier Ltd. All rights reserved. C1 Tech Univ Chemnitz, Inst Phys, D-09107 Chemnitz, Germany. RP Schreiber, M (reprint author), Tech Univ Chemnitz, Inst Phys, D-09107 Chemnitz, Germany. EM schreiber@physik.tu-chemnitz.de CR Bornmann L., 2014, JOURNAL OF THE ASSOC Bornmann L, 2013, J INFORMETR, V7, P158, DOI 10.1016/j.joi.2012.10.001 Bornmann L, 2013, J INFORMETR, V7, P933, DOI 10.1016/j.joi.2013.09.003 Hazen A., 1914, T AM SOC CIVIL ENG, V77, P1539 Schreiber M, 2013, J AM SOC INF SCI TEC, V64, P640, DOI 10.1002/asi.22752 Schreiber M, 2013, SCIENTOMETRICS, V97, P821, DOI 10.1007/s11192-013-0984-x Schreiber M, 2013, J AM SOC INF SCI TEC, V64, P861, DOI 10.1002/asi.22774 NR 7 TC 3 Z9 3 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 1751-1577 EI 1875-5879 J9 J INFORMETR JI J. Informetr. PD JUL PY 2014 VL 8 IS 3 BP 738 EP 748 DI 10.1016/j.joi.2014.06.007 PG 11 WC Information Science & Library Science SC Information Science & Library Science GA AO5IE UT WOS:000341376700025 ER PT J AU Hagen, NT AF Hagen, Nils T. TI Counting and comparing publication output with and without equalizing and inflationary bias SO JOURNAL OF INFORMETRICS LA English DT Article DE Publication performance ranking; Coauthor credit; Harmonic formula; Bibliometric bias; Equalizing bias; Inflationary bias ID PARTIAL RANK CORRELATION; CITATION; PRODUCTIVITY; AUTHORSHIP; CREDIT AB This paper examines the effects of inflationary and equalizing bias on publication output rankings. Any identifiable amount of bias in authorship accreditation was detrimental to accuracy when ranking a select group of leading Canadian aquaculture researchers. Bias arose when publication scores were calculated without taking into account information about multiple authorship and differential coauthor contributions. 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PD APR PY 2014 VL 8 IS 2 BP 310 EP 317 DI 10.1016/j.joi.2014.01.003 PG 8 WC Information Science & Library Science SC Information Science & Library Science GA AG7PK UT WOS:000335609900002 ER PT J AU Yan, EJ Guns, R AF Yan, Erjia Guns, Raf TI Predicting and recommending collaborations: An author-, institution-, and country-level analysis SO JOURNAL OF INFORMETRICS LA English DT Article DE Collaboration; Link prediction; Coauthors hip; Networks; Dynamics ID LINK-PREDICTION; CITATION NETWORKS; EVOLVING NETWORKS; SOCIAL NETWORKS; ROC CURVE; SCIENCE; TEAMS; STRATIFICATION; COMMUNITIES; ALGORITHMS AB This study examines collaboration dynamics with the goal to predict and recommend collaborations starting from the current topology. Author-, institution-, and country-level collaboration networks are constructed using a ten-year data set on library and information science publications. Different statistical approaches are applied to these collaboration networks. 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Informetr. PD APR PY 2014 VL 8 IS 2 BP 295 EP 309 DI 10.1016/j.joi.2014.01.008 PG 15 WC Information Science & Library Science SC Information Science & Library Science GA AG7PK UT WOS:000335609900001 ER PT J AU Bornmann, L Leydesdorff, L Wang, J AF Bornmann, Lutz Leydesdorff, Loet Wang, Jian TI How to improve the prediction based on citation impact percentiles for years shortly after the publication date? SO JOURNAL OF INFORMETRICS LA English DT Article DE Citation impact normalization; Percentile; Short citation window ID ASSESSMENTS; INDICATOR AB The findings of Bornmann, Leydesdorff, and Wang (2013b) revealed that the consideration of journal impact improves the prediction of long-term citation impact. This paper further explores the possibility of improving citation impact measurements on the base of a short citation window by the consideration of journal impact and other variables, such as the number of authors, the number of cited references, and the number of pages. The dataset contains 475,391 journal papers published in 1980 and indexed in Web of Science (WoS, Thomson Reuters), and all annual citation counts (from 1980 to 2010) for these papers. As an indicator of citation impact, we used percentiles of citations calculated using the approach of Hazen (1914). Our results show that citation impact measurement can really be improved: If factors generally influencing citation impact are considered in the statistical analysis, the explained variance in the long-term citation impact can be much increased. However, this increase is only visible when using the years shortly after publication but not when using later years. (C) 2013 Elsevier Ltd. All rights reserved. C1 [Bornmann, Lutz] Adm Headquarters Max Planck Soc, Div Sci & Innovat Studies, D-80539 Munich, Germany. [Leydesdorff, Loet] Univ Amsterdam, Amsterdam Sch Commun Res ASCoR, NL-1012 CX Amsterdam, Netherlands. [Wang, Jian] Inst Res Informat & Qual Assurance iFQ, D-10117 Berlin, Germany. 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Informetr. PD JAN PY 2014 VL 8 IS 1 BP 175 EP 180 DI 10.1016/j.joi.2013.11.005 PG 6 WC Information Science & Library Science SC Information Science & Library Science GA AB4PH UT WOS:000331771900016 ER PT J AU Abramo, G D'Angelo, CA Murgia, G AF Abramo, Giovanni D'Angelo, Ciriaco Andrea Murgia, Gianluca TI Gender differences in research collaboration SO JOURNAL OF INFORMETRICS LA English DT Article DE Research collaboration; Collaboration patterns; Gender; Bibliometrics; University ID SEX-DIFFERENCES; SCIENTIFIC PRODUCTIVITY; RESEARCH PERFORMANCE; GEOGRAPHIC-MOBILITY; ACADEMIC MEDICINE; SCIENCE; WOMEN; AUTHORSHIP; PATTERNS; CONSTRAINTS AB The debate on the role of women in the academic world has focused on various phenomena that could be at the root of the gender gap seen in many nations. However, in spite of the ever more collaborative character of scientific research, the issue of gender aspects in research collaborations has been treated in a marginal manner. 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Informetr. PY 2013 VL 7 IS 4 BP 811 EP 822 DI 10.1016/j.joi.2013.07.002 PG 12 WC Information Science & Library Science SC Information Science & Library Science GA 264ZV UT WOS:000327920400006 ER PT J AU Chen, DZ Huang, MH Ye, FY AF Chen, Dar-zen Huang, Mu-hsuan Ye, Fred Y. TI A probe into dynamic measures for h-core and h-tail SO JOURNAL OF INFORMETRICS LA English DT Article DE h-core; h-tail; Shape centroid; Shape descriptor; h-index; k-index ID HIRSCH INDEX; IMPACT; DISTRIBUTIONS; CITATIONS AB Using the concepts of h- core and h- tail, shape descriptors and shape centroids, k-index and k ' - index, dynamic measures are probed, with practical data in the fields of Physics and sociology. It is revealed that there are obvious differences between natural sciences ( Physics, particles & fields) and social sciences ( sociology) when c-descriptor, h- core centroid and index are applied as dynamic measures, while few differences exist when using t-descriptor, h- tail centroid and k ' - index, following a time span from 1 to 10 years. (C) 2012 Elsevier Ltd. All rights reserved. C1 [Chen, Dar-zen] Natl Taiwan Univ, Dept Mech Engn, Taipei 10764, Taiwan. [Chen, Dar-zen] Natl Taiwan Univ, Inst Ind Engn, Taipei 10764, Taiwan. [Huang, Mu-hsuan] Natl Taiwan Univ, Dept Lib & Informat Sci, Taipei 10764, Taiwan. [Ye, Fred Y.] Nanjing Univ, Sch Informat Management, Nanjing, Peoples R China. [Ye, Fred Y.] Zhejiang Univ, Dept Informat Resource Management, Hangzhou 310003, Zhejiang, Peoples R China. RP Ye, FY (reprint author), Nanjing Univ, Sch Informat Management, Nanjing, Peoples R China. 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TI The functional relation between the impact factor and the uncitedness factor revisited SO JOURNAL OF INFORMETRICS LA English DT Article DE Impact factor; Uncitedness factor; Universal informetric law; Distribution dependent law; Parameter dependent law ID HIRSCH-INDEX; LAW; MODEL; BENFORD; NUMBERS AB We give a heuristic proof of the relation between the impact factor (IF) and the uncitedness factor (U), the fraction of the papers that are uncited: U = 1/1+IF This generalizes the proof of Hsu and Huang [Physica A 391, 2129-2134, 2012] who obtain the same result but based on the assumption of the validity of the Matthew-effect. This new informetric function opens the discussion on universal informetric laws, distribution dependent laws and parameter dependent laws of which examples from the informetrics literature are given. (C) 2012 Elsevier Ltd. All rights reserved. C1 [Egghe, L.] Univ Hasselt UHasselt, B-3590 Diepenbeek, Belgium. 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PD JAN PY 2013 VL 7 IS 1 BP 183 EP 189 DI 10.1016/j.joi.2012.10.007 PG 7 WC Information Science & Library Science SC Information Science & Library Science GA 065BG UT WOS:000313121300022 ER PT J AU Gagolewski, M AF Gagolewski, Marek TI Scientific impact assessment cannot be fair SO JOURNAL OF INFORMETRICS LA English DT Article DE Impact functions; Aggregation; Decision making; Preference modeling; Hirsch's h-index; Scientometrics; Bibliometrics ID H-INDEX; AXIOMATIC ANALYSIS; HIRSCH-INDEX; OUTPUT AB In this paper we deal with the problem of aggregating numeric sequences of arbitrary length that represent e.g. citation records of scientists. Impact functions are the aggregation operators that express as a single number not only the quality of individual publications, but also their author's productivity. We examine some fundamental properties of these aggregation tools. It turns out that each impact function which always gives indisputable valuations must necessarily be trivial. Moreover, it is shown that for any set of citation records in which none is dominated by the other, we may construct an impact function that gives any a priori-established authors' ordering. Theoretically then, there is considerable room for manipulation in the hands of decision makers. We also discuss the differences between the impact function-based and the multicriteria decision making-based approach to scientific quality management, and study how the introduction of new properties of impact functions affects the assessment process. We argue that simple mathematical tools like the h- or g-index (as well as other bibliometric impact indices) may not necessarily be a good choice when it comes to assess scientific achievements. (C) 2013 Elsevier Ltd. All rights reserved. C1 [Gagolewski, Marek] Polish Acad Sci, Syst Res Inst, PL-01447 Warsaw, Poland. [Gagolewski, Marek] Warsaw Univ Technol, Fac Math & Informat Sci, PL-00662 Warsaw, Poland. RP Gagolewski, M (reprint author), Polish Acad Sci, Syst Res Inst, Ul Newelska 6, PL-01447 Warsaw, Poland. 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PY 2013 VL 7 IS 4 BP 792 EP 802 DI 10.1016/j.joi.2013.07.001 PG 11 WC Information Science & Library Science SC Information Science & Library Science GA 264ZV UT WOS:000327920400004 ER PT J AU He, B Ding, Y Tang, J Reguramalingam, V Bollen, J AF He, Bing Ding, Ying Tang, Jie Reguramalingam, Vignesh Bollen, Johan TI Mining diversity subgraph in multidisciplinary scientific collaboration networks: A meso perspective SO JOURNAL OF INFORMETRICS LA English DT Article DE Scientific collaboration; Network analysis; Subgraph detection ID INFORMATION-SCIENCE; COMMUNITY; LIBRARY; IMPACT AB This paper proposes a framework to analyze the interdisciplinary collaboration in a coauthorship network from a meso perspective using topic modeling: (1) a customized topic model is developed to capture and formalize the interdisciplinary feature; and (2) the two algorithms Diversity Subgraph Extraction (DSE) and Constraint-based Diversity Subgraph Extraction (CDSE) are designed and implemented to extract a meso view, i.e. a diversity subgraph of the interdisciplinary collaboration. The proposed framework is demonstrated using a coauthorship network in the field of computer science. A comparison between DSE and Breadth First Search (BSF)- based subgraph extraction favors DSE in capturing the diversity in interdisciplinary collaboration. Potential possibilities for studying various research topics based on the proposed framework of analysis are discussed. (C) 2012 Elsevier Ltd. All rights reserved. C1 [He, Bing; Ding, Ying] Indiana Univ, Sch Lib & Informat Sci, Bloomington, IN 47405 USA. [Reguramalingam, Vignesh; Bollen, Johan] Indiana Univ, Sch Informat & Comp, Bloomington, IN USA. [Tang, Jie] Tsinghua Univ, Dept Comp Sci & Technol, Beijing 100084, Peoples R China. RP He, B (reprint author), Indiana Univ, Sch Lib & Informat Sci, Bloomington, IN 47405 USA. 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PD JAN PY 2013 VL 7 IS 1 BP 117 EP 128 DI 10.1016/j.joi.2012.09.005 PG 12 WC Information Science & Library Science SC Information Science & Library Science GA 065BG UT WOS:000313121300015 ER PT J AU Kosmulski, M AF Kosmulski, Marek TI Family-tree of bibliometric indices SO JOURNAL OF INFORMETRICS LA English DT Article DE Successful paper; h-Index; Citation analysis ID H-INDEX AB Standard bibliometric indices were re-defined using a generalized concept of "successful paper". A family-tree based upon the new definitions provides new insights into the relationships between the standard indices, and empty boxes in the family-tree may inspire design of new indices. (c) 2012 Elsevier Ltd. All rights reserved. C1 Lublin Univ Technol, Lublin, Poland. RP Kosmulski, M (reprint author), Lublin Univ Technol, Lublin, Poland. 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PY 2013 VL 7 IS 2 BP 313 EP 317 DI 10.1016/j.joi.2012.12.002 PG 5 WC Information Science & Library Science SC Information Science & Library Science GA 136PY UT WOS:000318377100008 ER PT J AU Liu, JQ Rousseau, R Wang, MS Ye, FY AF Liu, Joan Q. Rousseau, Ronald Wang, Mona S. Ye, Fred Y. TI Ratios of h-cores, h-tails and uncited sources in sets of scientific papers and technical patents SO JOURNAL OF INFORMETRICS LA English DT Article DE h-Index; h-Core; h Tail; h-Ratio; Uncitedness; Scientific papers; Technical patents; Shifted Lotka distribution; Three-part division ID HIRSCH-INDEX; DISTRIBUTIONS AB Five ratios RH, RT, SH, ST and SZ derived from the three-part division of a set of sources in h-core, h-tail and uncited sources are defined. Dynamic changes in the three independent ratios RH, SH and SZ are studied for six selected topics. Data about these topics are obtained from the Web of Science for scientific papers and Derwent Innovations Index for technical patents. It is observed that all RH-and SH-values decrease when the time span widens, while SZ stays the same or increases; and that all RH- and SH-values for papers are larger than the corresponding values for patents. The shifted Lotka distribution is used in a theoretical interpretation of these empirical phenomena. (C) 2012 Elsevier Ltd. All rights reserved. C1 [Liu, Joan Q.] Lib Zhejiang Univ, Hangzhou, Zhejiang, Peoples R China. [Rousseau, Ronald] KHBO Assoc KU Leuven, Fac Engn Technol, B-8400 Oostende, Belgium. [Rousseau, Ronald] Katholieke Univ Leuven, Dept Math, B-3000 Louvain, Heverlee, Belgium. [Rousseau, Ronald] Univ Antwerp, IBW, B-2000 Antwerp, Belgium. [Wang, Mona S.] Zhejiang Univ, Dept Informat Resource Management, Hangzhou 310003, Zhejiang, Peoples R China. [Ye, Fred Y.] Nanjing Univ, Sch Informat Management, Nanjing 210093, Jiangsu, Peoples R China. RP Ye, FY (reprint author), Nanjing Univ, Sch Informat Management, 22 Hankou Rd, Nanjing 210093, Jiangsu, Peoples R China. 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T., 2009, PLOS ONE, V4, pe5429 NR 19 TC 3 Z9 3 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 1751-1577 J9 J INFORMETR JI J. Informetr. PD JAN PY 2013 VL 7 IS 1 BP 190 EP 197 DI 10.1016/j.joi.2012.11.002 PG 8 WC Information Science & Library Science SC Information Science & Library Science GA 065BG UT WOS:000313121300023 ER PT J AU Liu, YX Rousseau, R Guns, R AF Liu, Yuxian Rousseau, Ronald Guns, Raf TI A layered framework to study collaboration as a form of knowledge sharing and diffusion SO JOURNAL OF INFORMETRICS LA English DT Article DE Collaboration; Diffusion; Layered systems; Networks; Centrality indicators ID JOURNAL DIFFUSION AB Collaboration can be described using layered systems such as the article-author-institute-country structure. These structures can be considered 'cascades' or 'chains' of bipartite networks. We introduce a framework for characterizing and studying the intensity of collaboration between entities at a given level (e.g., between institutions). Specifically, we define the notions of significant, essential and vital nodes, and significant, essential and vital sub paths to describe the spread of knowledge through collaboration in such systems. Based on these notions, we introduce relative and absolute proper essential node (PEN) centrality as indicators of a node's importance for diffusion of knowledge through collaboration. We illustrate these concepts in an illustrative example and show how they can be applied using a small real-world example. Since collaboration implies knowledge sharing, it can be considered a special form of knowledge diffusion. (C) 2013 Elsevier Ltd. All rights reserved. C1 [Liu, Yuxian] Tongji Univ, Lib Tongji Univ, Shanghai 200092, Peoples R China. [Rousseau, Ronald; Guns, Raf] Univ Antwerp, Inst Educ & Informat Sci, IBW, B-2000 Antwerp, Belgium. 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TI Low-cost evaluation techniques for information retrieval systems: A review SO JOURNAL OF INFORMETRICS LA English DT Review DE Retrieval evaluation; Effectiveness metrics; Relevance judgment; Test collection; Pooling AB For a system-based information retrieval evaluation, test collection model still remains as a costly task. Producing relevance judgments is an expensive, time consuming task which has to be performed by human assessors. It is not viable to assess the relevancy of every single document in a corpus against each topic for a large collection. In an experimental-based environment, partial judgment on the basis of a pooling method is created to substitute a complete assessment of documents for relevancy. Due to the increasing number of documents, topics, and retrieval systems, the need to perform low-cost evaluations while obtaining reliable results is essential. Researchers are seeking techniques to reduce the costs of experimental IR evaluation process by the means of reducing the number of relevance judgments to be performed or even eliminating them while still obtaining reliable results. In this paper, various state-of-the-art approaches in performing low-cost retrieval evaluation are discussed under each of the following categories; selecting the best sets of documents to be judged; calculating evaluation measures, both, robust to incomplete judgments; statistical inference of evaluation metrics; inference of judgments on relevance, query selection; techniques to test the reliability of the evaluation and reusability of the constructed collections; and other alternative methods to pooling. This paper is intended to link the reader to the corpus of 'must read' papers in the area of low-cost evaluation of IR systems. (c) 2012 Elsevier Ltd. All rights reserved. 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Informetr. PY 2013 VL 7 IS 2 BP 301 EP 312 DI 10.1016/j.joi.2012.12.001 PG 12 WC Information Science & Library Science SC Information Science & Library Science GA 136PY UT WOS:000318377100007 ER PT J AU Petridis, K Malesios, C Arabatzis, G Thanassoulis, E AF Petridis, Konstantinos Malesios, Chrisovalantis Arabatzis, Garyfallos Thanassoulis, Emmanuel TI Efficiency analysis of forestry journals: Suggestions for improving journals' quality SO JOURNAL OF INFORMETRICS LA English DT Article DE Journal h-index; Journal impact factor (IF); DEA; Forestry journals ID DATA ENVELOPMENT ANALYSIS; NONPARAMETRIC FRONTIER MODELS; H-INDEX; GOOGLE-SCHOLAR; IMPACT FACTORS; CITATION ANALYSIS; HIRSCH-INDEX; SCIENCE; RANKING; INDICATORS AB In this paper we attempt to assess the impact of journals in the field of forestry, in terms of bibliometric data, by providing an evaluation of forestry journals based on data envelopment analysis (DEA). In addition, based on the results of the conducted analysis, we provide suggestions for improving the impact of the journals in terms of widely accepted measures of journal citation impact, such as the journal impact factor (IF) and the journal h-index. More specifically, by modifying certain inputs associated with the productivity of forestry journals, we have illustrated how this method could be utilized to raise their efficiency, which in terms of research impact can then be translated into an increase of their bibliometric indices, such as the h-index, IF or eigenfactor score. (c) 2013 Elsevier Ltd. All rights reserved. C1 [Petridis, Konstantinos; Arabatzis, Garyfallos] Democritus Univ Thrace, Dept Forestry & Management Environm & Nat Resourc, Orestiada 68200, Greece. [Malesios, Chrisovalantis] Democritus Univ Thrace, Dept Agr Dev, Orestiada 68200, Greece. [Thanassoulis, Emmanuel] Aston Univ, Aston Business Sch, Birmingham B4 7ET, W Midlands, England. 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PY 2013 VL 7 IS 2 BP 505 EP 521 DI 10.1016/j.joi.2013.02.002 PG 17 WC Information Science & Library Science SC Information Science & Library Science GA 136PY UT WOS:000318377100027 ER PT J AU Sangwal, K AF Sangwal, Keshra TI Citation and impact factor distributions of scientific journals published in individual countries SO JOURNAL OF INFORMETRICS LA English DT Article DE Adsorption isotherms; Citation analysis; Journal citation distribution; Journal impact-factor distribution; Journal half-life; Langmuir-type function; Mathematical functions ID H-INDEX; ICEBERG HYPOTHESIS; SCIENCE; SCOPUS; BEHAVIOR; AUTHORS; WEB AB The distributions of citations L, two- (IF2) and five-year impact factors (IF5), and citation half-lives lambda of journals published in different selected countries are analyzed using Langmuir-type relation: y(n) = y(0) {1 - alpha Kn/(1 + Kn)}, where y(n) denotes L-n, IF2(n) or IF5(n) of n-ranked journal, y(0) is the value of y(n) when journal rank n = 0, alpha is an empirical effectiveness parameter, and K is the Langmuir constant. It was found that: (1) the general features of the distribution of L-n, IF2(n) or IF5(n) of the journals published in different individual countries are similar to the results obtained before by the author from the analysis of the citation distribution data of papers of individual authors (K. Sangwal,Journal of Informetrics 7 (2013) 36-49), (2) in contrast to the theoretically expected value of the effectiveness parameter alpha = 1, the calculated values of alpha > 1 for journals published in different countries, (3) the trends of the distribution of cited half-lives lambda(n) of journals differ from those of L-n, IF2(n) and IF5(n) data for different countries, and show one, two or three linear regions, the longest linear regions with low slopes are observed in the case of countries publishing relatively high number of journals, and (4) the product of the Langmuir constant K and the number N of journals for the processes of citations and two- and five-year impact factors of journals published in different countries is constant for a process. The results suggest that: (1) the values of alpha > 1 are associated with a process that retards the generation of items (i.e. citations or impact factors), the difference (alpha - 1) being related to the dissemination of contents of the journals published by a country, and (2) the constancy of KN is related to the publication potential of a country. (c) 2013 Elsevier Ltd. All rights reserved. C1 Lublin Univ Technol, Dept Appl Phys, PL-20618 Lublin, Poland. RP Sangwal, K (reprint author), Lublin Univ Technol, Dept Appl Phys, Ul Nadbystrzycka 38, PL-20618 Lublin, Poland. 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SO JOURNAL OF INFORMETRICS LA English DT Article DE Hirsch-index; pi-Index; CDS-index; Citations Self-citations; Indicators ID H-INDEX; INDICATORS; IMPACT AB The aim of the study is to explore the effects of the increase in the number of publications or citations on several impact indicators by a single journal paper or citation. The possible change of the h-index, A-index, R-index, pi-index, pi-rate, Journal Paper Citedness ( JPC), and Citation Distribution Score (CDS) is followed by models. Particular attention is given to the increase of the indices by a single plus citation. The results obtained by the " successively built-up indicator" model show that with increasing number of citations or self-citations the indices may increase substantially. (C) 2012 Elsevier Ltd. All rights reserved. C1 Hungarian Acad Sci, Res Ctr Nat Sci, H-1525 Budapest, Hungary. RP Vinkler, P (reprint author), Hungarian Acad Sci, Res Ctr Nat Sci, POB 17, H-1525 Budapest, Hungary. EM vinkler.peter@ttk.mta.hu CR Aksnes DW, 2004, RES EVALUAT, V13, P33, DOI 10.3152/147154404781776563 Bartneck C, 2011, SCIENTOMETRICS, V87, P85, DOI 10.1007/s11192-010-0306-5 Bornmann L, 2011, J INFORMETR, V5, P346, DOI 10.1016/j.joi.2011.01.006 Bornmann L, 2011, J INFORMETR, V5, P228, DOI 10.1016/j.joi.2010.10.009 Costas R, 2010, SCIENTOMETRICS, V82, P517, DOI 10.1007/s11192-010-0187-7 Egghe L, 2006, SCIENTOMETRICS, V69, P131, DOI 10.1007/s11192-006-0144-7 Glanzel W, 2010, J INFORMETR, V4, P118, DOI 10.1016/j.joi.2009.10.002 Glanzel W, 2008, SCIENTOMETRICS, V77, P187, DOI 10.1007/s11192-007-1989-0 Hirsch JE, 2005, P NATL ACAD SCI USA, V102, P16569, DOI 10.1073/pnas.0507655102 Jin B., 2006, SCI FOCUS, V1, P8 Jin BH, 2007, CHINESE SCI BULL, V52, P855, DOI 10.1007/s11434-007-0145-9 Kotov NA, 2010, ACS NANO, V4, P585, DOI 10.1021/nn100182y Leydesdorff L, 2011, J INFORMETR, V5, P224, DOI 10.1016/j.joi.2010.10.003 Ravallion M., 2012, SCIENTOMETRICS, V88, P321 Schreiber M, 2010, ANN PHYS-BERLIN, V522, P536, DOI 10.1002/andp.201000046 Schreiber M, 2008, SCIENTOMETRICS, V76, P187, DOI 10.1007/s11192-007-1886-6 Schreiber M, 2009, ANN PHYS-BERLIN, V18, P607, DOI 10.1002/andp.200910360 Vieira ES, 2010, J INFORMETR, V4, P1, DOI 10.1016/j.joi.2009.06.002 Vinkler P, 2007, J INF SCI, V33, P481, DOI 10.1177/0165551506072165 Vinkler P, 2011, J AM SOC INF SCI TEC, V62, P1963, DOI 10.1002/asi.21600 Vinkler P, 2001, SCIENTOMETRICS, V50, P539, DOI 10.1023/A:1010519000767 Vinkler P, 2009, J INF SCI, V35, P602, DOI 10.1177/0165551509103601 VINKLER P, 2010, CHANDOS INF PROF SER, P1 Vinkler P, 2012, SCIENTOMETRICS, V92, P471, DOI 10.1007/s11192-012-0688-7 Vinkler P, 2010, SCIENTOMETRICS, V82, P461, DOI 10.1007/s11192-010-0182-z Vinkler P., 2011, J INFORMETR, V6, P254 Williamson JR, 2009, ACS CHEM BIOL, V4, P311, DOI 10.1021/cb9001014 NR 27 TC 3 Z9 3 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 1751-1577 J9 J INFORMETR JI J. Informetr. PD JAN PY 2013 VL 7 IS 1 BP 72 EP 83 DI 10.1016/j.joi.2012.08.001 PG 12 WC Information Science & Library Science SC Information Science & Library Science GA 065BG UT WOS:000313121300007 ER PT J AU Wang, XW Peng, L Zhang, CB Xu, SM Wang, Z Wang, CL Wang, XB AF Wang, Xianwen Peng, Lian Zhang, Chunbo Xu, Shenmeng Wang, Zhi Wang, Chuanli Wang, Xianbing TI Exploring scientists' working timetable: A global survey SO JOURNAL OF INFORMETRICS LA English DT Article DE Scientist; Realtime; Paper downloads; Work-life balance; Usage data ID FAMILY CONFLICT; SCIENCE AB In our previous study (Wang et al., 2012), we analyzed scientists' working timetable of 3 countries, using realtime downloading data of scientific literatures. In this paper, we make a through analysis about global scientists' working habits. Top 30 countries/territories from Europe, Asia, Australia, North America, Latin America and Africa are selected as representatives and analyzed in detail. Regional differences for scientists' working habits exists in different countries. Besides different working cultures, social factors could affect scientists' research activities and working patterns. Nevertheless, a common conclusion is that scientists today are often working overtime. Although scientists may feel engaged and fulfilled about their hard working, working too much still warns us to reconsider the work life balance. (C) 2013 Elsevier Ltd. All rights reserved. C1 [Wang, Xianwen; Peng, Lian; Zhang, Chunbo; Xu, Shenmeng; Wang, Zhi; Wang, Chuanli] Dalian Univ Technol, WISE Lab, Dalian 116085, Peoples R China. [Wang, Xianwen] Dalian Univ Technol, DUT Drexel Joint Inst Study Knowledge Visualizat, Dalian 116085, Peoples R China. [Wang, Xianbing] Dalian Univ Technol, Sch Control Sci & Engn, Dalian 116085, Peoples R China. RP Wang, XW (reprint author), Dalian Univ Technol, WISE Lab, Dalian 116085, Peoples R China. EM xianwenwang@dlut.edu.cn CR Blair-Loy Mary, 2004, FIGHTING TIME SHIFTI, P282 Fox MF, 2011, SOC STUD SCI, V41, P715, DOI 10.1177/0306312711417730 Fox MF, 2001, SOC STUD SCI, V31, P109, DOI 10.1177/030631201031001006 Frone M. 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PY 2013 VL 7 IS 3 BP 665 EP 675 DI 10.1016/j.joi.2013.04.003 PG 11 WC Information Science & Library Science SC Information Science & Library Science GA 210UH UT WOS:000323859700010 ER PT J AU Bornmann, L Ozimek, A AF Bornmann, Lutz Ozimek, Adam TI Stata commands for importing bibliometric data and processing author address information SO JOURNAL OF INFORMETRICS LA English DT Article DE Stata; Bibliometric toolbox; Spatial scientometrics; Geocoding ID SCIENCE; GEOGRAPHY; PATTERNS; CITIES; MAPS AB Given the recent trend in bibliometrics and information science to use increasingly complex statistical methods, it is necessary to have powerful toolboxes to work with data from Web of Science (Thomson Reuters). We developed such a toolbox with four specific commands for the statistical software package Stata. These commands refer to (1) the import of downloads from Web of Science to Stata, (2) the preprocessing of address information from authors of publications in the downloaded set, (3) the geocoding of address information, and (4) the calculation of the minimum and maximum distance between several co-authors of a single paper. An advantage of developing commands for an established and comprehensive statistical software package (like Stata) is that a large number of further commands are available for the analysis of bibliometric data. We will describe some of these useful commands as well. (C) 2012 Elsevier Ltd. All rights reserved. C1 [Bornmann, Lutz] Max Planck Gesell, Administrat Headquarters, D-80539 Munich, Germany. [Ozimek, Adam] Econsult Corp, Philadelphia, PA 19102 USA. RP Bornmann, L (reprint author), Max Planck Gesell, Administrat Headquarters, Hofgartenstr 8, D-80539 Munich, Germany. EM bornmann@gv.mpg.de; adam@econsult.com RI Bornmann, Lutz/A-3926-2008 OI Bornmann, Lutz/0000-0003-0810-7091 CR Belotti F, 2010, STATA J, V10, P458 Bornmann L, 2011, J INFORMETR, V5, P346, DOI 10.1016/j.joi.2011.01.006 Bornmann L, 2011, J INFORMETR, V5, P537, DOI 10.1016/j.joi.2011.05.005 Bornmann L, 2011, J AM SOC INF SCI TEC, V62, P1954, DOI 10.1002/asi.21611 Bornmann L, 2011, J INFORMETR, V5, P547, DOI 10.1016/j.joi.2011.04.006 Freese J., 2006, STATA J Gagolewski M, 2011, J INFORMETR, V5, P678, DOI 10.1016/j.joi.2011.06.006 HAUSMAN J, 1984, ECONOMETRICA, V52, P909, DOI 10.2307/1911191 Hennemann S, 2012, J INFORMETR, V6, P217, DOI 10.1016/j.joi.2011.12.002 Hosmer DW, 2000, APPL LOGISTIC REGRES, V2nd Jann B, 2005, STATA J, V5, P92 Leydesdorff L, 2010, J AM SOC INF SCI TEC, V61, P1622, DOI 10.1002/asi.21347 StataCorp, 2011, STAT STAT SOFTW REL Waltman L, 2011, J INFORMETR, V5, P574, DOI 10.1016/j.joi.2011.05.003 NR 14 TC 3 Z9 3 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 1751-1577 J9 J INFORMETR JI J. Informetr. PD OCT PY 2012 VL 6 IS 4 BP 505 EP 512 DI 10.1016/j.joi.2012.04.002 PG 8 WC Information Science & Library Science SC Information Science & Library Science GA 003AY UT WOS:000308581700007 ER PT J AU Garcia-Perez, MA AF Garcia-Perez, Miguel A. TI An extension of the h index that covers the tail and the top of the citation curve and allows ranking researchers with similar h SO JOURNAL OF INFORMETRICS LA English DT Article DE Citation analysis; Hirsch index; h index; Scientometric indicators ID WEB-OF-SCIENCE; GOOGLE SCHOLAR; DURFEE SQUARE; SCOPUS; PUBLICATION; CONS; PROS; INDICATORS; PSYCHOLOGY; COUNTS AB Citation curves for researchers with the same h index can vary greatly in the heaviness of their top (excess citations to core papers) or the heaviness of their tail (citations to non-core papers), revealing quantitative differences across researchers. Also, promotion to the next higher h depends only on citations received by a small subset of papers, so that researchers with a given h may have citation curves whose top and tail reveal a weaker impact than that of researchers with a lower h. To overcome these problems, we propose a two-sided h index, an extension that computes additional h indices progressively up the top and out the tail of the citation curve. This extension represents a citation curve descriptor one of whose elements is the scalar h. The advantages of the two-sided h index are illustrated through analysis of citation curves for 88 researchers with h indices ranging from 8 to 20. Several schemes are also discussed that use the two-sided h index to define criteria for ranking researchers within and across scalar h indices, according to whether the top of the citation curve, its tail, or both are deemed relevant under the circumstances in which research accomplishments are assessed. (C) 2012 Elsevier Ltd. All rights reserved. C1 Univ Complutense, Dept Metodol, Fac Psicol, Madrid 28223, Spain. RP Garcia-Perez, MA (reprint author), Univ Complutense, Dept Metodol, Fac Psicol, Campus Somosaguas, Madrid 28223, Spain. EM miguel@psi.ucm.es RI Garcia-Perez, Miguel Angel/F-7043-2011 OI Garcia-Perez, Miguel Angel/0000-0003-2669-4429 CR Abt HA, 2012, SCIENTOMETRICS, V91, P863, DOI 10.1007/s11192-011-0525-4 Anderson TR, 2008, SCIENTOMETRICS, V76, P577, DOI 10.1007/s11192-007-2071-2 Bar-Ilan J, 2008, SCIENTOMETRICS, V74, P257, DOI 10.1007/s11192-008-0216-y Bornmann L, 2011, J INFORMETR, V5, P346, DOI 10.1016/j.joi.2011.01.006 Bornmann L, 2010, J INFORMETR, V4, P407, DOI 10.1016/j.joi.2010.03.005 Bornmann L, 2012, J INFORMETR, V6, P11, DOI 10.1016/j.joi.2011.08.004 Dorta-Gonzalez P, 2011, SCIENTOMETRICS, V88, P729, DOI 10.1007/s11192-011-0453-3 Egghe L, 2010, J INFORMETR, V4, P14, DOI 10.1016/j.joi.2009.06.001 Falmagne JC, 2005, J MATH PSYCHOL, V49, P436, DOI 10.1016/j.jmp.2005.06.007 Franceschini F, 2010, J INFORMETR, V4, P503, DOI 10.1016/j.joi.2010.05.004 Garcia-Perez MA, 2009, SPAN J PSYCHOL, V12, P833 Garcia-Perez MA, 2011, J INFORMETR, V5, P214, DOI 10.1016/j.joi.2010.07.006 Garcia-Perez M. A., CORRELATION IN PRESS Garcia-Perez MA, 2009, SCIENTOMETRICS, V81, P779, DOI 10.1007/s11192-009-2290-1 Garcia-Perez MA, 2010, J AM SOC INF SCI TEC, V61, P2070, DOI 10.1002/asi.21372 Glanzel W, 2010, J INFORMETR, V4, P313, DOI 10.1016/j.joi.2010.01.005 Henzinger M, 2010, SCIENTOMETRICS, V84, P465, DOI 10.1007/s11192-009-0098-7 Hirsch JE, 2010, SCIENTOMETRICS, V85, P741, DOI 10.1007/s11192-010-0193-9 Hirsch JE, 2005, P NATL ACAD SCI USA, V102, P16569, DOI 10.1073/pnas.0507655102 Jacso P, 2008, ONLINE INFORM REV, V32, P437, DOI 10.1108/14684520810889718 Jacso P, 2008, ONLINE INFORM REV, V32, P524, DOI 10.1108/14684520810897403 Jacso P, 2008, LIBR TRENDS, V56, P784 Jacso P, 2008, ONLINE INFORM REV, V32, P673, DOI 10.1108/14684520810914043 Kosmulski M, 2009, J INFORMETR, V3, P341, DOI 10.1016/j.joi.2009.05.003 Kuan CH, 2011, J INFORMETR, V5, P515, DOI 10.1016/j.joi.2011.04.003 Levine-Clark M., 2009, J BUSINESS FINANCE L, V14, P32, DOI [DOI 10.1080/08963560802176348, 10.1080/08963560802176348] Liu XZ, 2012, SCIENTOMETRICS, V91, P37, DOI 10.1007/s11192-011-0571-y Meho LI, 2007, J AM SOC INF SCI TEC, V58, P2105, DOI 10.1002/asi.20677 Meho LI, 2008, J AM SOC INF SCI TEC, V59, P1711, DOI 10.1002/asi.20874 Norris M, 2007, J INFORMETR, V1, P161, DOI 10.1016/j.joi.2006.12.001 Panaretos J, 2009, SCIENTOMETRICS, V81, P635, DOI 10.1007/s11192-008-2174-9 Prathap G, 2010, SCIENTOMETRICS, V84, P149, DOI 10.1007/s11192-009-0067-1 Rosenberg M. S., 2011, BIOL GUIDE IMPACT FA Schreiber M, 2012, J INFORMETR, V6, P347, DOI 10.1016/j.joi.2012.02.001 Ruane F, 2008, SCIENTOMETRICS, V75, P395, DOI 10.1007/s11192-007-1869-7 Vaughan L, 2008, SCIENTOMETRICS, V74, P317, DOI 10.1007/s11192-008-0220-2 Vieira ES, 2009, SCIENTOMETRICS, V81, P587, DOI 10.1007/s11192-009-2178-0 Walters WH, 2009, PORTAL-LIBR ACAD, V9, P5 Ye FY, 2010, SCIENTOMETRICS, V84, P431, DOI 10.1007/s11192-009-0099-6 Zhang L, 2011, J INFORMETR, V5, P583, DOI 10.1016/j.joi.2011.05.004 NR 40 TC 3 Z9 3 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 1751-1577 J9 J INFORMETR JI J. Informetr. PD OCT PY 2012 VL 6 IS 4 BP 689 EP 699 DI 10.1016/j.joi.2012.07.004 PG 11 WC Information Science & Library Science SC Information Science & Library Science GA 003AY UT WOS:000308581700028 ER PT J AU Egghe, L AF Egghe, L. TI Five years "Journal of Informetrics" SO JOURNAL OF INFORMETRICS LA English DT Article DE Journal of Informetrics ID EXPANSION; FIELD AB End of 2011, the Journal of Informetrics (Elsevier) existed five years. We overview its scope, published articles (topics, co-authorship, authors' countries), editorial decisions, editorial and production times, impact factor and article downloads aspects. Finally we present a local citation environment map of JOI. (C) 2012 Elsevier Ltd. All rights reserved. C1 Univ Hasselt UHasselt, B-3590 Diepenbeek, Belgium. RP Egghe, L (reprint author), Univ Hasselt UHasselt, Campus Diepenbeek,Agoralaan, B-3590 Diepenbeek, Belgium. EM leo.egghe@uhasselt.be CR Egghe L, 2005, INFORM PROCESS MANAG, V41, P1311, DOI 10.1016/j.ipm.2005.03.011 Egghe L, 2006, INFORM PROCESS MANAG, V42, P1405, DOI 10.1016/j.ipm.2006.02.004 NR 2 TC 3 Z9 3 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 1751-1577 J9 J INFORMETR JI J. Informetr. PD JUL PY 2012 VL 6 IS 3 BP 422 EP 426 DI 10.1016/j.joi.2012.02.003 PG 5 WC Information Science & Library Science SC Information Science & Library Science GA 937LN UT WOS:000303660100008 ER PT J AU Kosmulski, M AF Kosmulski, Marek TI Calibration against a reference set: A quantitative approach to assessment of the methods of assessment of scientific output SO JOURNAL OF INFORMETRICS LA English DT Article DE Citation analysis; Scientific output; Hirsch-type index ID H-INDEX; HIRSCH-INDEX AB A set of authors whose scientific output can be unequivocally ranged from the highest to the lowest is used to assess the methods of assessment of scientific output. The rank-rank correlation coefficient between the known order in the calibration set and the order produced by certain method of assessment is a quantitative measure of the quality of that method. A common-sense-based reference may play a positive role in the communication between the enthusiasts and antagonists of bibliometric indices. (C) 2012 Elsevier Ltd. All rights reserved. C1 Lublin Univ Technol, Lublin, Poland. RP Kosmulski, M (reprint author), Lublin Univ Technol, Lublin, Poland. EM mkosmuls@abo.fi RI Kosmulski, Marek/B-9158-2009; Kosmulski, Marek/F-2326-2010 CR Allen L, 2009, PLOS ONE, V4, DOI 10.1371/journal.pone.0005910 Bornmann L, 2011, J INFORMETR, V5, P346, DOI 10.1016/j.joi.2011.01.006 Bornmann L, 2005, SCIENTOMETRICS, V65, P391, DOI 10.1007/s11192-005-0281-4 Egghe L, 2006, SCIENTOMETRICS, V69, P131, DOI 10.1007/s11192-006-0144-7 Hirsch JE, 2005, P NATL ACAD SCI USA, V102, P16569, DOI 10.1073/pnas.0507655102 Jin BH, 2007, CHINESE SCI BULL, V52, P855, DOI 10.1007/s11434-007-0145-9 Kosmulski M., 2006, ISSI NEWSLETTER, P4 Kosmulski M, 2010, J INFORMETR, V4, P351, DOI 10.1016/j.joi.2010.02.004 Kosmulski M, 2011, J INFORMETR, V5, P481, DOI 10.1016/j.joi.2011.03.001 Opthof T, 2009, NETH HEART J, V17, P145 Tol RSJ, 2009, SCIENTOMETRICS, V80, P317, DOI 10.1007/s11192-008-2079-7 Van Raan AFJ, 2006, SCIENTOMETRICS, V67, P491, DOI 10.1556/Scient.67.2006.3.10 Vinkler P, 2010, SCIENTOMETRICS, V82, P461, DOI 10.1007/s11192-010-0182-z NR 13 TC 3 Z9 3 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 1751-1577 J9 J INFORMETR JI J. Informetr. PD JUL PY 2012 VL 6 IS 3 BP 451 EP 456 DI 10.1016/j.joi.2012.03.004 PG 6 WC Information Science & Library Science SC Information Science & Library Science GA 937LN UT WOS:000303660100012 ER PT J AU Egghe, L AF Egghe, L. TI Averages of ratios compared to ratios of averages: Mathematical results SO JOURNAL OF INFORMETRICS LA English DT Article DE Average of ratios; Ratio of averages; Global impact factor; Average impact factor; Crown indicator ID IMPACT AB The recently awakened discussion on the usability of averages of ratios (AoR) compared to ratios of averages (RoA) has led to the mathematical results in this paper. Based on the empirical results in Lariviere and Gingras (2011) we prove, under reasonable conditions, the following relations between AoR and RoA for a set of points: (i) The regression line of RoA in function of AoR is the first bisectrix. (ii) (AoR - RoA)/AoR in function of the number N of papers is a cloud of points comprised between a multiple of 1 root N and - 1 root N. (iii) (AoR - RoA)/AoR versus RoA has a decreasing regression line. (C) 2012 Elsevier Ltd. All rights reserved. C1 [Egghe, L.] Univ Hasselt, B-3590 Diepenbeek, Belgium. [Egghe, L.] Univ Antwerp, IBW, B-2000 Antwerp, Belgium. RP Egghe, L (reprint author), Univ Hasselt, Campus Diepenbeek,Agoralaan, B-3590 Diepenbeek, Belgium. EM leo.egghe@uhasselt.be CR Blom G, 1989, PROBABILITY STAT THE Egghe L, 1996, J INFORM SCI, V22, P165, DOI 10.1177/016555159602200302 Egghe L, 2000, J AM SOC INFORM SCI, V51, P145, DOI 10.1002/(SICI)1097-4571(2000)51:2<145::AID-ASI6>3.0.CO;2-9 Egghe L, 1996, SCIENTOMETRICS, V36, P97, DOI 10.1007/BF02126648 Egghe L, 2002, CAN J INFORM LIB SCI, V27, P29 Egghe L., 2001, ELEMENTARY STAT EFFE Hox J. J., 2010, MULTILEVEL ANAL Lariviere V, 2011, J INFORMETR, V5, P392, DOI 10.1016/j.joi.2011.02.001 Opthof T, 2010, J INFORMETR, V4, P423, DOI 10.1016/j.joi.2010.02.003 Rousseau R., 2011, ISSI NEWSLETTER, V7, P10 Waltman L, 2011, SCIENTOMETRICS, V87, P467, DOI 10.1007/s11192-011-0354-5 Waltman L, 2011, J INFORMETR, V5, P37, DOI 10.1016/j.joi.2010.08.001 NR 12 TC 3 Z9 3 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 1751-1577 J9 J INFORMETR JI J. Informetr. PD APR PY 2012 VL 6 IS 2 BP 307 EP 317 DI 10.1016/j.joi.2011.12.007 PG 11 WC Information Science & Library Science SC Information Science & Library Science GA 906RF UT WOS:000301364100015 ER PT J AU Huang, MH Dong, HR Chen, DZ AF Huang, Mu-Hsuan Dong, Huei-Ru Chen, Dar-Zen TI Globalization of collaborative creativity through cross-border patent activities SO JOURNAL OF INFORMETRICS LA English DT Article DE Patent; Global collaboration; Social network; Collaborative creativity; Patentometrics ID PUBLIC SCIENCE; INNOVATION; TECHNOLOGY; INDICATORS; AUTHORSHIP; KNOWLEDGE; NETWORKS; LINKAGE; TRENDS AB This study examines global collaborative creativity through patentometrics and social network analysis. Because patents are a direct output of innovative activities, cross-border patents are used to analyze the trend of global collaborative creativity. The results show linear growth of cross-border patents, while numerous inventors have grown exponentially for collaborative creativity. The number of inventors for global collaborative creativity trends have increased more rapidly than the number of patents. The network for global collaborative creativity is denser and shows a growing trend over a five-year interval. Both observed and cosine-normalized numbers of k-cores in global collaborative creativity show a growing trend, while the cosine-normalized k-cores increase slowly compared to the observed one. Similarly, the social network analysis confirms a growing network of global collaborative creativity, which is dense despite its small degree of growth. This study also found that high values of "betweenness" tend to spread from core countries to periphery countries. Collaborative creativity has globalized but remains concentrated in core countries such as the U.S., the UK, France, Germany, and Canada. (C) 2011 Elsevier Ltd. All rights reserved. C1 [Chen, Dar-Zen] Natl Taiwan Univ, Dept Mech Engn, Taipei 10617, Taiwan. 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PD APR PY 2012 VL 6 IS 2 BP 226 EP 236 DI 10.1016/j.joi.2011.10.003 PG 11 WC Information Science & Library Science SC Information Science & Library Science GA 906RF UT WOS:000301364100007 ER PT J AU Kim, H Yoon, JW Crowcroft, J AF Kim, Hyoungshick Yoon, Ji Won Crowcroft, Jon TI Network analysis of temporal trends in scholarly research productivity SO JOURNAL OF INFORMETRICS LA English DT Article DE Publication analysis; Research trend; Comparative analysis; Network analysis; Security research; Korean research ID COMPUTER-SCIENCE; COMMUNITIES; MODELS AB We propose a method to identify the journals or proceedings that are most highly esteemed by a research group over some time frame. Using open publication databases, we identify the experts in the community, and analyse their publication pattern, and then use this as a guideline for evaluating scientific outputs of other groups of researchers publishing in the same domain. To illustrate the practicality of our method, we analyse the scientific output of Korean researchers in the security subject domain from 2004 to 2009, and comparing this groups' output with that of well-known researchers. Our empirical analysis demonstrates that there is a persistent gap between these two research groups' publications impact over this period, although the absolute number of journal publications greatly increased over recent years. (C) 2011 Elsevier Ltd. All rights reserved. C1 [Kim, Hyoungshick; Crowcroft, Jon] Univ Cambridge, Comp Lab, Cambridge CB2 3QG, England. [Yoon, Ji Won] Trinity Coll Dublin, Dept Stat, Dublin 2, Ireland. RP Yoon, JW (reprint author), Univ Cambridge, Comp Lab, Pembroke St, Cambridge CB2 3QG, England. 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Informetr. PD JAN PY 2012 VL 6 IS 1 BP 97 EP 110 DI 10.1016/j.joi.2011.05.006 PG 14 WC Information Science & Library Science SC Information Science & Library Science GA 865QL UT WOS:000298325300013 ER PT J AU Vanclay, JK AF Vanclay, Jerome K. TI Publication patterns of award-winning forest scientists and implications for the Australian ERA journal ranking SO JOURNAL OF INFORMETRICS LA English DT Article DE Excellence for Research in Australia (ERA); Impact assessment; Journal ranking ID IMPACT FACTOR; BIBLIOMETRIC ANALYSIS; RESEARCH OUTPUT; H-INDEX; RESEARCHERS; EIGENFACTOR; SCIMAGO; BIAS; TOOL AB Publication patterns of 79 forest scientists awarded major international forestry prizes during 1990-2010 were compared with the journal classification and ranking promoted as part of the 'Excellence in Research for Australia' (ERA) by the Australian Research Council. The data revealed that these scientists exhibited an elite publication performance during the decade before and two decades following their first major award. An analysis of their 1703 articles in 431 journals revealed substantial differences between the journal choices of these elite scientists and the ERA classification and ranking of journals. Implications from these findings are that additional cross-classifications should be added for many journals, and there should be an adjustment to the ranking of several journals relevant to the ERA Field of Research classified as 0705 Forestry Sciences. Crown Copyright (C) 2011 Published by Elsevier Ltd. All rights reserved. C1 So Cross Univ, Lismore, NSW 2480, Australia. RP Vanclay, JK (reprint author), So Cross Univ, POB 157, Lismore, NSW 2480, Australia. 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EM bornmann@gv.mpg.de RI Moya Anegon, Felix/C-4004-2009; Bornmann, Lutz/A-3926-2008 OI Moya Anegon, Felix/0000-0002-0255-8628; Bornmann, Lutz/0000-0003-0810-7091 CR ANEGON FD, 2011, RES IMPACT NATL HIGH Bornmann L., 2008, ETHICS SCI ENV POLIT, V8, P93, DOI DOI 10.3354/ESEP00084 Cohen J, 1988, STAT POWER ANAL BEHA Kohler U., 2009, DATA ANAL USING STAT Kraemer HC, 2003, J AM ACAD CHILD PSY, V42, P1524, DOI 10.1097/01.chi.0000091507.46853.d1 Rehn C., 2007, BIBLIOMETRIC INDICAT SCImago Reseach Group, 2010, SIR WORLD REP 2010 G NR 7 TC 3 Z9 3 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 1751-1577 J9 J INFORMETR JI J. Informetr. PD JUL PY 2011 VL 5 IS 3 BP 486 EP 488 DI 10.1016/j.joi.2011.03.005 PG 3 WC Information Science & Library Science SC Information Science & Library Science GA 769QF UT WOS:000291032500018 ER PT J AU Hu, XJ Rousseau, R Chen, J AF Hu, Xiaojun Rousseau, Ronald Chen, Jin TI Time series of outgrow indices SO JOURNAL OF INFORMETRICS LA English DT Article DE Structural citation network studies; Outgrow index; Time series; Diachronous; Synchronous; Citation analysis; References ID SCIENCE; INFORMETRICS; IMPACT AB The outgrow index measures to which extent an article outgrows - in terms of citations - the references on which it is based. In this article, three types of time series of outgrow indices and one outgrow index matrix are introduced. Examples of these time series are given illustrating the newly introduced concepts. These time series expand the toolbox for citation analysis by focusing on a specific subnetwork of the global citation network. It is stated that citation analysis has three application areas: information retrieval, research evaluation and structural citation network studies. This contribution is explicitly placed among structural network studies. (C) 2011 Elsevier Ltd. All rights reserved. C1 [Hu, Xiaojun; Chen, Jin] Zhejiang Univ, Coll Publ Adm, Hangzhou 310027, Zhejiang, Peoples R China. [Hu, Xiaojun] Zhejiang Univ, Sch Med, Med Informat Ctr, Hangzhou 310027, Zhejiang, Peoples R China. [Rousseau, Ronald] KHBO Assoc KU Leuven, Fac Engn Technol, B-8400 Oostende, Belgium. [Rousseau, Ronald] Univ Antwerp, IBW, B-2000 Antwerp, Belgium. [Rousseau, Ronald] Katholieke Univ Leuven, Dept Math, B-3001 Louvain, Heverlee, Belgium. RP Chen, J (reprint author), Zhejiang Univ, Coll Publ Adm, 38 Zheda Rd, Hangzhou 310027, Zhejiang, Peoples R China. 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Informetr. PD JUL PY 2011 VL 5 IS 3 BP 422 EP 430 DI 10.1016/j.joi.2011.03.002 PG 9 WC Information Science & Library Science SC Information Science & Library Science GA 769QF UT WOS:000291032500010 ER PT J AU Silva, FN Viana, MP Travencolo, BAN Costa, LD AF Silva, F. N. Viana, M. P. Travencolo, B. A. N. Costa, L. da F. TI Investigating relationships within and between category networks in Wikipedia SO JOURNAL OF INFORMETRICS LA English DT Article DE Complex network; Wikipedia; Map of science ID COMPLEX NETWORKS; SCIENCE; MAP AB This work maps and analyses cross-citations in the areas of Biology, Mathematics, Physics and Medicine in the English version of Wikipedia, which are represented as an undirected complex network where the entries correspond to nodes and the citations among the entries are mapped as edges. We found a high value of clustering coefficient for the areas of Biology and Medicine, and a small value for Mathematics and Physics. The topological organization is also different for each network, including a modular structure for Biology and Medicine, a sparse structure for Mathematics and a dense core for Physics. The networks have degree distributions that can be approximated by a power-law with a cut-off. The assortativity of the isolated networks has also been investigated and the results indicate distinct patterns for each subject. We estimated the betweenness centrality of each node considering the full Wikipedia network, which contains the nodes of the four subjects and the edges between them. In addition, the average shortest path length between the subjects revealed a close relationship between the subjects of Biology and Physics, and also between Medicine and Physics. Our results indicate that the analysis of the full Wikipedia network cannot predict the behavior of the isolated categories since their properties can be very different from those observed in the full network. (C) 2011 Elsevier Ltd. All rights reserved. C1 [Silva, F. N.; Viana, M. P.; Costa, L. da F.] Univ Sao Paulo, Inst Phys Sao Carlos, BR-13560970 Sao Paulo, Brazil. [Travencolo, B. A. N.] Univ Fed Uberlandia, Fac Comp, BR-38400902 Uberlandia, MG, Brazil. RP Costa, LD (reprint author), Univ Sao Paulo, Inst Phys Sao Carlos, BR-13560970 Sao Paulo, Brazil. EM filipinascimento@gmail.com; vianamp@gmail.com; travencolo@gmail.com; ldfcosta@gmail.com RI Viana, Matheus/A-7137-2012; Costa, Luciano/H-5475-2011; Silva, Filipi/C-7620-2012; Travencolo, Bruno/F-6752-2010; Sistemas Complexos, Inct/J-8597-2013 OI Viana, Matheus/0000-0001-9288-2108; Silva, Filipi/0000-0002-9151-6517; Travencolo, Bruno/0000-0001-7690-301X; CR Barabasi, 2002, REV MOD PHYS, V74, P47, DOI DOI 10.1103/REVMODPHYS.74.47 Barabasi AL, 1999, PHYSICA A, V272, P173, DOI 10.1016/S0378-4371(99)00291-5 Bollen J., 2009, PLOS ONE, V4 Boyack KW, 2009, SCIENTOMETRICS, V79, P27, DOI 10.1007/s11192-009-0402-6 Boyack KW, 2005, SCIENTOMETRICS, V64, P351, DOI 10.1007/s11192-005-0255-6 CAPOCCI A, 2008, EUROPHYSICS LETT, V81 Capocci A, 2006, PHYS REV E, V74, DOI 10.1103/PhysRevE.74.036116 Costa LD, 2007, ADV PHYS, V56, P167, DOI 10.1080/00018730601170527 Dorogovtsev SN, 2002, ADV PHYS, V51, P1079, DOI 10.1080/00018730110112519 FREEMAN LC, 1979, SOC NETWORKS, V1, P215, DOI 10.1016/0378-8733(78)90021-7 HOLLOWAY T, 2005, ARXIVORGCS0512085 Klavans R, 2009, J AM SOC INF SCI TEC, V60, P455, DOI 10.1002/asi.20991 Klavans R, 2008, SCIENTOMETRICS, V75, P239, DOI 10.1007/s11192-007-1854-1 Leydesdorff L, 2009, J AM SOC INF SCI TEC, V60, P348, DOI 10.1002/asi.20967 Muchnik L, 2007, PHYS REV E, V76, DOI 10.1103/PhysRevE.76.016106 Newman M. E. J, 2010, NETWORKS INTRO Newman MEJ, 2002, PHYS REV LETT, V89, DOI 10.1103/PhysRevLett.89.208701 Porter AL, 2009, SCIENTOMETRICS, V81, P719, DOI 10.1007/s11192-008-2197-2 Porter AL, 2009, NAT NANOTECHNOL, V4, P534, DOI 10.1038/nnano.2009.207 Rosvall M, 2008, P NATL ACAD SCI USA, V105, P1118, DOI 10.1073/pnas.0706851105 Watts D., 2003, SMALL WORLDS DYNAMIC ZLATI CV, 2006, PHYS REV E, V74 NR 22 TC 3 Z9 3 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 1751-1577 J9 J INFORMETR JI J. Informetr. PD JUL PY 2011 VL 5 IS 3 BP 431 EP 438 DI 10.1016/j.joi.2011.03.003 PG 8 WC Information Science & Library Science SC Information Science & Library Science GA 769QF UT WOS:000291032500011 ER PT J AU Ajiferuke, I Lu, K Wolfram, D AF Ajiferuke, Isola Lu, Kun Wolfram, Dietmar TI Who are the research disciples of an author? Examining publication recitation and oeuvre citation exhaustivity SO JOURNAL OF INFORMETRICS LA English DT Article DE Citation analysis; Citer analysis; Recitation; Scholarly communication ID IMAGE-MAKERS; INDEX; IDENTITY; OUTCOMES; CITERS; IMPACT AB Recitation patterns for individual publications are examined and mathematically modeled by focusing on the origin of citations (citers) using data from Thomson Reuters Web of Science. The authors outline oeuvre citation exhaustivity, or the practice of citing across the body of work of an author, and model the resulting frequency distributions to identify research disciples and admirers. A Geeta distribution provided the best fits for both recitation frequency and oeuvre citation exhaustivity distributions. The findings provide a novel way to identify the influence of an author based on citer analysis. (C) 2011 Elsevier Ltd. All rights reserved. C1 [Lu, Kun; Wolfram, Dietmar] Univ Wisconsin, Sch Informat Studies, Milwaukee, WI 53201 USA. [Ajiferuke, Isola] Univ Western Ontario, Fac Informat & Media Studies, London, ON N6A 5B7, Canada. RP Wolfram, D (reprint author), Univ Wisconsin, Sch Informat Studies, POB 413, Milwaukee, WI 53201 USA. EM iajiferu@uwo.ca; kunlu@uwm.edu; dwolfram@uwm.edu RI Wolfram, Dietmar/A-2449-2008 CR Ajiferuke I, 2010, J AM SOC INF SCI TEC, V61, P2086, DOI 10.1002/asi.21383 Ajiferuke I, 2006, J INF SCI, V32, P212, DOI 10.1177/0165551506064361 Ajiferuke I, 2010, SCIENTOMETRICS, V83, P623, DOI 10.1007/s11192-009-0127-6 AJIFERUKE I, 1988, SCIENTOMETRICS, V14, P421, DOI 10.1007/BF02017100 Ajiferuke I., 2009, P 12 INT C INT SOC S, P798 Bar-Ilan J, 2006, INFORM PROCESS MANAG, V42, P1553, DOI 10.1016/j.ipm.2006.03.019 COLE J, 1971, AM SOCIOL, V6, P23 CONSUL PC, 1990, COMMUN STAT THEORY, V19, P3051, DOI 10.1080/03610929008830364 Costas R, 2010, SCIENTOMETRICS, V82, P517, DOI 10.1007/s11192-010-0187-7 Cronin B, 2002, SCIENTOMETRICS, V54, P31, DOI 10.1023/A:1015628320056 Cronin B, 2001, J AM SOC INF SCI TEC, V52, P558, DOI 10.1002/asi.1097 DIEKS D, 1976, SOC STUD SCI, V6, P247, DOI 10.1177/030631277600600204 Franceschini F, 2010, SCIENTOMETRICS, V85, P203, DOI 10.1007/s11192-010-0165-0 Hirsch JE, 2005, P NATL ACAD SCI USA, V102, P16569, DOI 10.1073/pnas.0507655102 Johnson B, 2007, J DOC, V63, P609, DOI 10.1108/00220410710827727 Katsaros D, 2009, J AM SOC INF SCI TEC, V60, P1051, DOI 10.1002/asi.21040 Marion LS, 2002, P ASIST ANNU, V39, P3 MARION LS, 2004, THESIS DREXEL U PHIL McCain KW, 2009, J AM SOC INF SCI TEC, V60, P1301, DOI 10.1002/asi.21064 Swarna T, 2008, MALAYS J LIBR INF SC, V13, P49 White HD, 2001, J AM SOC INF SCI TEC, V52, P87, DOI 10.1002/1097-4571(2000)9999:9999<::AID-ASI1542>3.3.CO;2-K White HD, 2000, ASIST MON SER, P475 NR 22 TC 3 Z9 3 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 1751-1577 J9 J INFORMETR JI J. Informetr. PD APR PY 2011 VL 5 IS 2 BP 292 EP 302 DI 10.1016/j.joi.2011.01.001 PG 11 WC Information Science & Library Science SC Information Science & Library Science GA 732AV UT WOS:000288154700005 ER PT J AU Gao, X Guo, XC Sylvan, KJ Guan, JC AF Gao, Xia Guo, Xiaochuan Sylvan, Katz J. Guan, Jiancheng TI The Chinese innovation system during economic transition: A scale-independent view SO JOURNAL OF INFORMETRICS LA English DT Article DE Scale-independent indicators; Chinese national and regional innovation systems; Economic transition ID REGIONS AB This paper uses scale-independent indicators to explore the Chinese national and regional innovation systems during economic transition. Our perception of an innovation system is frequently informed by conventional indicators based on linear assumptions while actually innovation systems may behave differently. Scale-independent indicators characterize non-linear properties of an innovation system. They can give decision makers deeper insight into the dynamics of innovation systems, and they may lead to more practical public policies [Katz, J. S. (2006). Indicators for complex innovation systems. Research Policy, 35, 893-909]. As reported for the European and Canadian innovation systems the Chinese systems exhibited scaling correlations between GERD (Gross Expenditure on Domestic R&D) and GDP (Gross Domestic Product) over time and at points in time. The scaling factors of the correlations tell us that between 1995 and 2005 the Chinese GERD exhibited a strong nonlinear tendency to increase with GDP. Furthermore they show that the GERD of the Western region is growing much slower than its GDP as compared with Eastern and Central regions. This observation has policy implications suggesting further improvements need to be made to the research infrastructure and funding of the Western region. The GDP-POP (Population) scaling factor shows that the 'wealth intensity' or GDP per capita is increasing much faster than the exponential growth of the Chinese population. In contrast the systemic GDP-POP scaling factor shows that regional development is non-linear. Finally, the paper-GDP and patent-GDP scaling factors tell us that outputs of science and technology for China are growing faster than economic growth. The systemic paper-GDP and patent-GDP scaling factors show that the growth rates are uneven across the provinces. (C) 2010 Elsevier Ltd. All rights reserved. C1 [Gao, Xia; Guo, Xiaochuan] Inner Mongolia Univ, Sch Econ & Management, Hohhot, Peoples R China. [Sylvan, Katz J.] Univ Sussex, Freeman Ctr, SPRU, Brighton BN1 9QE, E Sussex, England. [Sylvan, Katz J.] Univ Saskatchewan, Dept Math & Stat, Saskatoon, SK S7N SE6, Canada. [Guan, Jiancheng] Fudan Univ, Sch Management, Shanghai 200433, Peoples R China. RP Gao, X (reprint author), Inner Mongolia Univ, Sch Econ & Management, Da Xue W Rd 235, Hohhot, Peoples R China. EM gaoxia1976@sina.com CR Bao SM, 2002, CHINA ECON REV, V13, P89, DOI 10.1016/S1043-951X(02)00055-X Brun JF, 2002, CHINA ECON REV, V13, P161, DOI 10.1016/S1043-951X(02)00070-6 Buesa M, 2006, TECHNOVATION, V26, P463, DOI 10.1016/j.technovation.2004.11.007 BUESA M, 2002, SISTEMA REGIONAL INN BUHRER S, 2004, COMP GUIDE MULTI ACT COOKE P, 2000, Z ACS, P53 COOKE P, 1997, RES POLICY, V26, P474 Cooke P., 2001, IND CORP CHANGE, V10, P945, DOI DOI 10.1093/ICC/10.4.945 EDQUIST C, 1993, GLOBALISATION VERSUS FREEMAN C., 1987, TECHNOLOGY POLICY EC Gao X, 2009, J INFORMETR, V3, P321, DOI 10.1016/j.joi.2009.04.004 Gu S., 2006, INNOVATION MANAGEMEN, V8, P1 Guan JC, 2005, INT J TECHNOL MANAGE, V32, P225, DOI 10.1504/IJTM.2005.007331 GUAN JC, 2009, CHINA RES POLICY, V38, P802 Hilpert U., 1991, REGIONAL INNOVATION Katz J. 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PD OCT PY 2010 VL 4 IS 4 BP 618 EP 628 DI 10.1016/j.joi.2010.07.001 PG 11 WC Information Science & Library Science SC Information Science & Library Science GA 647KA UT WOS:000281616200016 ER PT J AU Ocholla, DN Onyancha, OB Britz, J AF Ocholla, Dennis N. Onyancha, Omwoyo Bosire Britz, Johannes TI Can information ethics be conceptualized by using the core/periphery model? SO JOURNAL OF INFORMETRICS LA English DT Article DE Information ethics; Informetrics; Webometrics; Content analysis; Core/periphery model; Information science AB The term 'information ethics' (IE) is rapidly diversifying as new technologies enter the milieu and add to already existing 'entanglements'. Unsurprisingly, the term lacks a universally accepted definition, although there is some common ground as to its constitution. This paper explores the term using the most commonly co-occurring terms in IE literature as indexed in nine databases, namely the EBSCO-hosted Academic Search Premier (ASP); Communication and Mass Media Complete; ERIC; Library, Information Science and Technology Abstracts (LISTA); Newspaper Complete; Business Premier; and Master File Premier, and Wilson's Library Literature and Information Science (LLIS) Full Text. Core/periphery analysis, the co-occurrence of words as subject terms, and social network techniques were applied using UCINET for Windows, text STAT and Bibexcel computer-aided software to analyze data. The paper identifies the most common terms used to describe IE and the core terms with which IE can be defined. Other than informing LIS research and education, the results could potentially assist with the development of IE taxonomy and definitions (e. g. in understanding IE content and development) that may apply to the intercultural and global understanding of IE. (C) 2010 Elsevier Ltd. All rights reserved. C1 [Ocholla, Dennis N.] Univ Zululand, Dept Informat Studies, ZA-3886 Kwa Dlangezwa, South Africa. [Britz, Johannes] Univ Wisconsin, Sch Informat Studies, Milwaukee, WI 53201 USA. [Britz, Johannes] Univ Pretoria, ZA-0002 Pretoria, South Africa. RP Ocholla, DN (reprint author), Univ Zululand, Dept Informat Studies, Private Bag X1001, ZA-3886 Kwa Dlangezwa, South Africa. EM docholla@pan.uzulu.ac.za; bonyancha@yahoo.com; britz@uwm.edu RI Onyancha, Omwoyo Bosire/D-3970-2015 OI Onyancha, Omwoyo Bosire/0000-0002-9232-4939 CR Borgatti S. 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PD OCT PY 2010 VL 4 IS 4 BP 492 EP 502 DI 10.1016/j.joi.2010.05.001 PG 11 WC Information Science & Library Science SC Information Science & Library Science GA 647KA UT WOS:000281616200005 ER PT J AU Schreiber, M AF Schreiber, Michael TI A new family of old Hirsch index variants SO JOURNAL OF INFORMETRICS LA English DT Article DE Hirsch index; g-Index; Performance evaluation; Citations; Ranking; Generalized mean ID SCIENTIFIC-RESEARCH OUTPUT; H-INDEX; EGGHES G; PHYSICISTS AB The Hirsch index h and the g index proposed by Egghe as well as the f index and the t index proposed by Tol are shown to be special cases of a family of Hirsch index variants, based on the generalized mean with exponent p. Inequalities between the different indices are derived from the generalized mean inequality. The graphical determination of the indices is shown for one example. (C) 2010 Elsevier Ltd. All rights reserved. C1 Tech Univ Chemnitz, Inst Phys, D-09107 Chemnitz, Germany. RP Schreiber, M (reprint author), Tech Univ Chemnitz, Inst Phys, D-09107 Chemnitz, Germany. EM schreiber@physik.tu-chemnitz.de CR Burrell QL, 2009, SCIENTOMETRICS, V79, P79, DOI 10.1007/s11192-009-0405-3 Egghe L, 2006, SCIENTOMETRICS, V69, P131, DOI 10.1007/s11192-006-0144-7 Egghe L., 2006, ISSI NEWSLETTER, V2, P8 Egghe L, 2008, J AM SOC INF SCI TEC, V59, P1304, DOI 10.1002/asi.20823 Hirsch JE, 2005, P NATL ACAD SCI USA, V102, P16569, DOI 10.1073/pnas.0507655102 Prathap G, 2006, CURR SCI INDIA, V91, P1439 Rousseau R., 2006, SIMPLE MODELS CORRES Schreiber M, 2010, J AM SOC INF SCI TEC, V61, P169, DOI 10.1002/asi.21218 SCHREIBER M, 2010, ANN PHYS BERLIN Schreiber M, 2008, J AM SOC INF SCI TEC, V59, P1513, DOI 10.1002/asi.20856 Schreiber M, 2007, ANN PHYS-BERLIN, V16, P640, DOI 10.1002/andp.200710252 Schubert A, 2007, SCIENTOMETRICS, V70, P201, DOI 10.1007/s11192-007-0112-x Tol RSJ, 2009, SCIENTOMETRICS, V80, P317, DOI 10.1007/s11192-008-2079-7 Woeginger GJ, 2009, J AM SOC INF SCI TEC, V60, P1267, DOI 10.1002/asi.21061 NR 14 TC 3 Z9 3 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 1751-1577 J9 J INFORMETR JI J. Informetr. PD OCT PY 2010 VL 4 IS 4 BP 647 EP 651 DI 10.1016/j.joi.2010.05.002 PG 5 WC Information Science & Library Science SC Information Science & Library Science GA 647KA UT WOS:000281616200020 ER PT J AU Small, H AF Small, Henry TI Critical thresholds for co-citation clusters and emergence of the giant component SO JOURNAL OF INFORMETRICS LA English DT Article DE Co-citation clusters; Giant component; Critical thresholds; Percolation; Science maps ID COLLABORATION NETWORK; SCIENCE AB The behavior of co-citation clusters is studied over a wide range of similarity values, and we demonstrate the existence of critical or percolation transitions marked by a sudden expansion of cluster size with a small decrease in similarity which, in most cases, reflects the emergence of a giant component on the overall graph for the dataset. The study was motivated by the question of how to set appropriate thresholds for delineating individual research areas that identify, as far as possible, natural boundaries, in view of the fact that a threshold or criterion appropriate for one area may not be appropriate for another. We explore the rate of change in cluster size as a possible boundary indicator. The relationship of this critical behavior to maps of science is discussed. (C) 2009 Elsevier Ltd. All rights reserved. C1 Thomson Reuters, Philadelphia, PA 19104 USA. RP Small, H (reprint author), Thomson Reuters, 3501 Market St, Philadelphia, PA 19104 USA. EM henry.small@thomsonreuters.com RI Small, Henry/A-1026-2007 CR Achlioptas D, 2009, SCIENCE, V323, P1453, DOI 10.1126/science.1167782 Bollobas B, 2004, LECT NOTES COMPUT SC, V3243, P1 Callaway DS, 2001, PHYS REV E, V64, DOI 10.1103/PhysRevE.64.041902 FRUCHTERMAN TMJ, 1991, SOFTWARE PRACT EXPER, V21, P1129, DOI 10.1002/spe.4380211102 Guimera R, 2005, SCIENCE, V308, P697, DOI 10.1126/science.1106340 HARTIGAN JA, 1975, CLUSTERING ALGORITHM, P199 Leydesdorff L, 2009, J AM SOC INF SCI TEC, V60, P348, DOI 10.1002/asi.20967 Newman MEJ, 2001, PHYS REV E, V64, DOI 10.1103/PhysRevE.64.026118 Serrano MA, 2006, PHYS REV E, V74, DOI 10.1103/PhysRevE.74.056115 Small H, 1999, LIBR TRENDS, V48, P72 Small H, 1999, J AM SOC INFORM SCI, V50, P799, DOI 10.1002/(SICI)1097-4571(1999)50:9<799::AID-ASI9>3.0.CO;2-G Tomassini M, 2007, PHYSICA A, V385, P750, DOI 10.1016/j.physa.2007.07.028 NR 12 TC 3 Z9 3 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 1751-1577 J9 J INFORMETR JI J. Informetr. PD OCT PY 2009 VL 3 IS 4 BP 332 EP 340 DI 10.1016/j.joi.2009.05.001 PG 9 WC Information Science & Library Science SC Information Science & Library Science GA 484VB UT WOS:000269075100007 ER PT J AU Yu, HR Davis, M Wilson, CS Cole, FTH AF Yu, Hairong Davis, Mari Wilson, Concepcion S. Cole, Fletcher T. H. TI Object-relational data modelling for informetric databases SO JOURNAL OF INFORMETRICS LA English DT Article; Proceedings Paper CT 11th International Conference of the International-Society-for-Scientometrics-and-Informetrics CY JUN 25-27, 2007 CL Madrid, SPAIN SP Int Soc Scientometr & Informetr, CSIC, Minist Educ & Ciencia, FECYT, Comunidad Madrid, Eugene Garfield Fdn, Thomson, Elsevier, Journal Informetr, Scopus, Ayuntamiento Madrid, Sci Metrix, Univ Carlos III Madrid DE object-relational database systems (ORDB); complex data modelling; bibliometrics; informetrics; scientometrics; interdisciplinary application AB Informetric researchers have long chafed at the limitations of bibliographic databases for their analyses, without being able to visualize or develop real solutions to the problem. This paper describes a solution developed to provide for the specialist needs of informetric researchers. In a collaborative exercise between the fields of computer science and informetrics, data modelling was used in order to address the requirements of complex and dynamic informetric data. This paper reports on this modelling experience with its aim of building an object-relational database (ORDB) for informetric research purposes. The paper argues that ORM (object-relational model) is particularly suitable because it allows for the modelling of complex data and accommodates the various data source formats and standards used by a variety of bibliographic databases. Further, ORM captures the dynamic nature of informetric data by allowing user-defined data types and by embedding basic statistical calculating tools as object functions in these user-defined data types. The main ideas of the paper are implemented in an Oracle database management system. (C) 2008 Elsevier Ltd. All rights reserved. C1 [Yu, Hairong; Davis, Mari; Wilson, Concepcion S.; Cole, Fletcher T. H.] Univ New S Wales, Australian Sch Business, Sch Informat Syst Technol & Management SISTM, Sydney, NSW 2052, Australia. RP Yu, HR (reprint author), Univ New S Wales, Australian Sch Business, Sch Informat Syst Technol & Management SISTM, Sydney, NSW 2052, Australia. EM hairong.yu@unsw.edu.au; m.davis@unsw.edu.au; c.wilson@unsw.edu.au; f.cole@unsw.edu.au RI Wilson, Concepcion/M-8784-2014 CR Borgman CL., 1990, SCHOLARLY COMMUNICAT DATE CJ, 2004, INTRO DATABASE SYSTE, pCH26 Davis M, 2001, SCIENTOMETRICS, V52, P395, DOI 10.1023/A:1014291715245 Davis S, 2003, NAT STRUCT BIOL, V10, P38, DOI 10.1038/nsb880 Green R, 1996, INFORM TECHNOL LIBR, V15, P207 Hood WW, 2003, SCIENTOMETRICS, V58, P587, DOI 10.1023/B:SCIE.0000006882.47115.c6 Hudomalj E, 2003, SCIENTOMETRICS, V58, P609, DOI 10.1023/B:SCIE.0000006883.28709.d2 Jarvelin K, 2000, J DOC, V56, P250, DOI 10.1108/EUM0000000007115 LaRowe G, 2007, Proceedings of ISSI 2007: 11th International Conference of the International Society for Scientometrics and Informetrics, Vols I and II, P457 LEYDESDORFF L, 1989, SCIENTOMETRICS, V15, P333, DOI 10.1007/BF02017058 McCabe M. 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TI The estimation of the number of lost multi-copy documents: A new type of informetrics theory SO JOURNAL OF INFORMETRICS LA English DT Article DE multi-copy document; book historical law AB A probabilistic model is presented to estimate the number of lost multi-copy documents, based on retrieved ones. For this, we only need the number of retrieved documents of which we have one copy and the number of retrieved documents of which we have two copies. If we also have the number of retrieved documents of which we have three copies then we are also able to estimate the number of copies of the documents that ever existed (assumed that this number is fixed over all documents). Simulations prove the stability of the model. The model is applied to the estimation of the number of lost printed programmes of Jesuit theatre plays in the Provincia Flandro-Belgica before 1773. This Jesuit province was an administrative entity of the order, which was territorially slightly larger in extent than present day Flanders, the northern, Dutch-speaking part of Belgium. It is noted that the functional model P-j for the fraction of retrieved documents with j copies is a size-frequency function satisfying (Pj+1/P-j)/(P-j/Pj-1)<1 for all j. It is further noted that the "classical" size-frequency functions are different: Lotka's function satisfies the opposite inequality and the decreasing exponential one gives always 1 for the above ratio, hence showing that we are in a new type of informetrics theory. We also provide a mathematical rationale for the "book historical law" stating that the probability to lose a copy of a multi-copy document (i.e. an edition) is an increasing function of the size of the edition. The paper closes with some open problems and a description of other potential applications of this probabilistic model. (c) 2007 Published by Elsevier Ltd. C1 [Egghe, L.] Univ Hasselt, B-3590 Diepenbeek, Belgium. [Egghe, L.] Univ Antwerp, B-2610 Antwerp, Belgium. [Proot, G.] Univ Antwerp, B-2000 Antwerp, Belgium. RP Egghe, L (reprint author), Univ Hasselt, Campus Diepenbeek, B-3590 Diepenbeek, Belgium. EM leo.egghe@uhasselt.be; goran.proot@ua.ac.be CR Canavos G, 1984, APPL PROBABILITY STA Egghe L, 2005, LIBR INFORM SCI SER, P1 Grimmett G. R., 1985, PROBABILITY RANDOM P PROOT G, IN PRESS PAPERS BIBL WILLARD O, 1943, LIBRARY, V23, P171 NR 5 TC 3 Z9 3 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 1751-1577 EI 1875-5879 J9 J INFORMETR JI J. Informetr. PY 2007 VL 1 IS 4 BP 257 EP 268 DI 10.1016/j.joi.2007.02.003 PG 12 WC Information Science & Library Science SC Information Science & Library Science GA 272BF UT WOS:000253831900001 ER PT J AU Ruiz-Castillo, J Costas, R AF Ruiz-Castillo, Jaiver Costas, Rodrigo TI The skewness of scientific productivity SO JOURNAL OF INFORMETRICS LA English DT Article DE Individual scientist's productivity distributions; Skewness of science; Disambiguation algorithm; Co-authorship ID SUB-FIELD NORMALIZATION; CITATION DISTRIBUTIONS; LOTKAS LAW; IMPACT; INDICATORS; SCIENCE; COLLABORATION; UNIVERSALITY AB This paper exploits a unique 2003-2011 large dataset, indexed by Thomson Reuters, consisting of 17.2 million disambiguated authors classified into 30 broad scientific fields, as well as the 48.2 million articles resulting from a multiplying strategy in which any article coauthored by two or more persons is wholly assigned as many times as necessary to each of them. The dataset is characterized by a large proportion of authors who have their oeuvre in several fields. We measure individual productivity in two ways that are uncorrelated: as the number of articles per person and as the mean citation per article per person in the 2003-2011 period. We analyze the shape of the two types of individual productivity distributions in each field using size-and scale-independent indicators. To assess the skewness of productivity distributions we use a robust index of skewness, as well as the Characteristic Scores and Scales approach. For productivity inequality, we use the coefficient of variation. In each field, we study two samples: the entire population, and what we call "successful authors", namely, the subset of scientists whose productivity is above their field average. The main result is that, in spite of wide differences in production and citation practices across fields, the shape of field productivity distributions is very similar across fields. The parallelism of the results for the population as a whole and for the subset of successful authors, when productivity is measured as mean citation per article per person, reveals the fractal nature of the skewness of scientific productivity in this case. These results are essentially maintained when any article co-authored by two or more persons is fractionally assigned to each of them. (C) 2014 Elsevier Ltd. All rights reserved. C1 [Ruiz-Castillo, Jaiver] Univ Carlos III Madrid, Dept Econ, E-28903 Getafe, Spain. [Costas, Rodrigo] Leiden Univ, Ctr Sci & Technol Studies, NL-2300 RA Leiden, Netherlands. RP Ruiz-Castillo, J (reprint author), Univ Carlos III Madrid, Dept Econ, E-28903 Getafe, Spain. 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This article fits discrete versions of the power law, the lognormal distribution and the hooked power law to 20 different Scopus categories, using citations to articles published in 2004 and ignoring uncited articles. The results show that, despite its popularity, the power law is not a suitable model for collections of articles from a single subject and year, even for the purpose of estimating the slope of the tail of the citation data. Both the hooked power law and the lognormal distributions fit best for some subjects but neither is a universal optimal choice and parameter estimates for both seem to be unreliable. Hence only the hooked power law and discrete lognormal distributions should be considered for subject-and-year-based citation analysis in future and parameter estimates should always be interpreted cautiously. (C) 2014 Elsevier Ltd. All rights reserved. C1 [Thelwall, Mike; Wilson, Paul] Wolverhampton Univ, Sch Math & Comp Sci, Stat Cybermetr Res Grp, Wolverhampton WV1 1LY, W Midlands, England. RP Thelwall, M (reprint author), Wolverhampton Univ, Sch Math & Comp Sci, Stat Cybermetr Res Grp, Wulfruna St, Wolverhampton WV1 1LY, W Midlands, England. 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PD OCT PY 2014 VL 8 IS 4 BP 824 EP 839 DI 10.1016/j.joi.2014.08.001 PG 16 WC Information Science & Library Science SC Information Science & Library Science GA AU3QB UT WOS:000345527400003 ER PT J AU Ortega, JL AF Luis Ortega, Jose TI Influence of co-authorship networks in the research impact: Ego network analyses from Microsoft Academic Search SO JOURNAL OF INFORMETRICS LA English DT Article DE Bibliometrics; Academic search engines; Ego networks; Research impact; Co-authorship ID GOOGLE SCHOLAR CITATIONS; SCIENTIFIC COLLABORATION; INTERNATIONAL COLLABORATION; SOCIAL-SCIENCES; CENTRALITY; PERFORMANCE AB The main objective of this study is to analyze the relationship between research impact and the structural properties of co-author networks. A new bibliographic source, Microsoft Academic Search, is introduced to test its suitability for bibliometric analyses. Citation counts and 500 one-step ego networks were extracted from this engine. Results show that tiny and sparse networks - characterized by a high Betweenness centrality and a high Average path length - achieved more citations per document than dense and compact networks described by a high Clustering coefficient and a high Average degree. According to disciplinary differences, Mathematics, Social Sciences and Economics & Business are the disciplines with more sparse and tiny networks; while Physics, Engineering and Geosciences are characterized by dense and crowded networks. This suggests that in sparse ego networks, the central author have more control on their collaborators being more selective in their recruitment and concluding that this behaviour has positive implications in the research impact. (C) 2014 Elsevier Ltd. All rights reserved. C1 CCHS CSIC, Cybermetr Lab, Madrid 28037, Spain. RP Ortega, JL (reprint author), CCHS CSIC, Cybermetr Lab, Albasanz 26-28, Madrid 28037, Spain. 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TI Impact coverage of the success-index SO JOURNAL OF INFORMETRICS LA English DT Article DE Success-index; Hirsch-index; h-Index; g-Index; Wu-index; Kosmulski-index ID HIRSCH-INDEX; INFORMETRIC MODEL AB We show mathematically that the success-index can be any of the following impact indices, dependent on the value of the threshold used in the definition of the success-index: Hirsch-index (h-index), g-index, generalized Wu- and Kosmulski-indices, the average. (C) 2014 Elsevier Ltd. All rights reserved. C1 [Egghe, L.] Univ Hasselt UHasselt, B-3590 Diepenbeek, Belgium. [Egghe, L.] UA, IBW, B-2000 Antwerp, Belgium. RP Egghe, L (reprint author), Univ Hasselt UHasselt, Campus Diepenbeek, B-3590 Diepenbeek, Belgium. EM leo.egghe@uhasselt.be CR Egghe L, 2012, SCIENTOMETRICS, V91, P295, DOI 10.1007/s11192-011-0539-y Egghe L, 2012, J AM SOC INF SCI TEC, V63, P1048, DOI 10.1002/asi.22617 Egghe L, 2006, SCIENTOMETRICS, V69, P131, DOI 10.1007/s11192-006-0144-7 Egghe L, 2011, J INFORMETR, V5, P439, DOI 10.1016/j.joi.2011.03.006 Egghe L, 2013, J INFORMETR, V7, P388, DOI 10.1016/j.joi.2013.01.005 Egghe L, 2013, PRO INT CONF SCI INF, P1159 Egghe L, 2006, SCIENTOMETRICS, V69, P121, DOI 10.1007/s11192-006-0143-8 Franceschini F, 2013, J INFORMETR, V7, P109, DOI 10.1016/j.joi.2012.09.008 Hirsch JE, 2005, P NATL ACAD SCI USA, V102, P16569, DOI 10.1073/pnas.0507655102 Jin BH, 2007, CHINESE SCI BULL, V52, P855, DOI 10.1007/s11434-007-0145-9 Kosmulski M., 2006, ISSI NEWSLETTER, V2, P4 Waltman L, 2012, J AM SOC INF SCI TEC, V63, P406, DOI 10.1002/asi.21678 Wu Q, 2010, J AM SOC INF SCI TEC, V61, P609, DOI 10.1002/asi.21276 NR 13 TC 2 Z9 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 1751-1577 EI 1875-5879 J9 J INFORMETR JI J. Informetr. PD APR PY 2014 VL 8 IS 2 BP 384 EP 389 DI 10.1016/j.joi.2014.01.005 PG 6 WC Information Science & Library Science SC Information Science & Library Science GA AG7PK UT WOS:000335609900009 ER PT J AU Chen, KM Jen, TH Wu, M AF Chen, Kuan-Ming Jen, Tsung-Hau Wu, Margaret TI Estimating the accuracies of journal impact factor through bootstrap SO JOURNAL OF INFORMETRICS LA English DT Article DE Bootstrap; Journal impact factor; Error estimation; Education; Citation index ID CITATION ANALYSIS; EVALUATION TOOL; CENSORED-DATA; SCIENCE; FIELDS; RELIABILITY AB The journal impact factor (JIF) reported in journal citation reports has been used to represent the influence and prestige of a journal. Whereas the consideration of the stochastic nature of a statistic is a prerequisite for statistical inference, the estimation of JIF uncertainty is necessary yet unavailable for comparing the impact among journals. Using journals in the Database of Research in Science Education (DoRISE), the current study proposes bootstrap methods to estimate the JIF variability. The paper also provides a comprehensive exposition of the sources of JIF variability. The collections of articles in the year of interest and in the preceding years both contribute to JIF variability. In addition, the variability estimate differs depending on the way a database selects its journals for inclusion. In the bootstrap process, the nested structure of articles in a journal was accounted for to ensure that each bootstrap replication reflects the actual citation characteristics of articles in the journal. In conclusion, the proposed point and interval estimates of the JIF statistic are obtained and more informative inferences on the impact of journals can be drawn. (C) 2013 Elsevier Ltd. All rights reserved. C1 [Chen, Kuan-Ming; Jen, Tsung-Hau] Natl Taiwan Normal Univ, Sci Educ Ctr, Taipei 11677, Taiwan. [Wu, Margaret] Victoria Univ, Work Based Educ Res Ctr WERC, Victoria Inst Educ Divers & Lifelong Learning, Melbourne, Vic 8001, Australia. RP Jen, TH (reprint author), Natl Taiwan Normal Univ, Sci Educ Ctr, 88,4th Sect,Ting Chou Rd, Taipei 11677, Taiwan. 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After reviewing all the related papers in Web of Science, Google Scholar and Scopus database, we find the current literature on citation distribution gives more focus on the distribution of the percentages and citations of papers receiving at least one citation, while there are fewer studies on the time-dependent patterns of the percentage of never-cited papers, on what distribution model can fit their time-dependent patterns, as well as on the factors influencing the non-citation rate. Here, we perform an empirical pilot analysis to the time-dependent distribution of the percentages of never-cited papers in a series of different, consecutive citation time windows following their publication in our selected six sample journals, and study the influence of paper length on the chance of papers' getting cited. Through the above analysis, the following general conclusions are drawn: (1) a three-parameter negative exponential model can well fit timedependent distribution curve of the percentages of never-cited papers; (2) in the initial citation time window, the percentage of never-cited papers in each journal is very high. However, as the citation time window becomes wider and wider, the percentage of never-cited papers begins to drop rapidly at first, and then drop more slowly, and the total degree of decline for most of journals is very large; (3) when applying the wider citation time windows, the percentage of never-cited papers for each journal begins to approach a stable value, and after that value, there will be very few changes in these stable percentages, unless we meet a large amount of "Sleeping Beauties" type papers; (4) the length of an paper has a great influence on whether it will be cited or not. (C) 2013 Elsevier Ltd. All rights reserved. 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PD JAN PY 2014 VL 8 IS 1 BP 136 EP 146 DI 10.1016/j.joi.2013.11.002 PG 11 WC Information Science & Library Science SC Information Science & Library Science GA AB4PH UT WOS:000331771900013 ER PT J AU Jeong, YK Song, M Ding, Y AF Jeong, Yoo Kyung Song, Min Ding, Ying TI Content-based author co-citation analysis SO JOURNAL OF INFORMETRICS LA English DT Article DE Author co-citation analysis; Citation content analysis; Bibliometrics; Information science; Citation analysis ID INTELLECTUAL STRUCTURE; ALL-AUTHOR; INFORMATION-SCIENCE; CITATION ANALYSIS; MANAGEMENT FIELD; PROXIMITY; WEB; PUBLICATIONS; NETWORKS; 1ST AB Author co-citation analysis (ACA) has long been used as an effective method for identifying the intellectual structure of a research domain, but it relies on simple co-citation counting, which does not take the citation content into consideration. The present study proposes a new method for measuring the similarity between co-cited authors by considering author's citation content. We collected the full-text journal articles in the information science domain and extracted the citing sentences to calculate their similarity distances. We compared our method with traditional ACA and found out that our approach, while displaying a similar intellectual structure for the information science domain as the other baseline methods, also provides more details about the sub-disciplines in the domain than with traditional ACA. (C) 2013 Elsevier Ltd. All rights reserved. C1 [Jeong, Yoo Kyung; Song, Min] Yonsei Univ, Dept Lib & Informat Sci, Seoul 120749, South Korea. [Ding, Ying] Indiana Univ, Dept Informat & Lib Sci, Bloomington, IN USA. RP Song, M (reprint author), Yonsei Univ, Dept Lib & Informat Sci, Seoul 120749, South Korea. 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Informetr. PD JAN PY 2014 VL 8 IS 1 BP 197 EP 211 DI 10.1016/j.joi.2013.12.001 PG 15 WC Information Science & Library Science SC Information Science & Library Science GA AB4PH UT WOS:000331771900018 ER PT J AU Lee, H Shin, J AF Lee, Hakyeon Shin, Juneseuk TI Measuring journal performance for multidisciplinary research: An efficiency perspective SO JOURNAL OF INFORMETRICS LA English DT Article DE Journal performance; Journal quality; Data envelopment analysis (DEA); Impact factor (IF); Multidisciplinary ID DATA ENVELOPMENT ANALYSIS; NORMALIZED IMPACT FACTOR; DEA APPROACH; SCIENCE; ECONOMICS; QUALITY; DOCUMENTATION; METHODOLOGY; MANAGEMENT; PROGRAMS AB One of the flaws of the journal impact factor (IF) is that it cannot be used to compare journals from different fields or multidisciplinary journals because the IF differs significantly across research fields. This study proposes a new measure of journal performance that captures field-different citation characteristics. We view journal performance from the perspective of the efficiency of a journal's citation generation process. Together with the conventional variables used in calculating the IF, the number of articles as an input and the number of total citations as an output, we additionally consider the two field-different factors, citation density and citation dynamics, as inputs. We also separately capture the contribution of external citations and self-citations and incorporate their relative importance in measuring journal performance. To accommodate multiple inputs and outputs whose relationships are unknown, this study employs data envelopment analysis (DEA), a multi-factor productivity model for measuring the relative efficiency of decision-making units without any assumption of a production function. The resulting efficiency score, called DEA-IF, can then be used for the comparative evaluation of multidisciplinary journals' performance. 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PD JAN PY 2014 VL 8 IS 1 BP 77 EP 88 DI 10.1016/j.joi.2013.10.004 PG 12 WC Information Science & Library Science SC Information Science & Library Science GA AB4PH UT WOS:000331771900008 ER PT J AU Lungeanu, A Huang, Y Contractor, NS AF Lungeanu, Alina Huang, Yun Contractor, Noshir S. TI Understanding the assembly of interdisciplinary teams and its impact on performance SO JOURNAL OF INFORMETRICS LA English DT Article DE Team assembly; Social network analysis; Co-authorship network; Citation network; Interdisciplinary collaboration; Grant decision-making ID DEEP-LEVEL DIVERSITY; TRANSACTIVE MEMORY; NETWORK ANALYSIS; SOCIAL NETWORKS; SCIENTIFIC PRODUCTIVITY; GENDER-DIFFERENCES; MARKOV GRAPHS; CO-AUTHORSHIP; SCIENCE; COLLABORATION AB Interdisciplinary teams are assembled in scientific research and are aimed at solving complex problems. Given their increasing importance, it is not surprising that considerable attention has been focused on processes of collaboration in interdisciplinary teams. Despite such efforts, we know less about the factors affecting the assembly of such teams in the first place. In this paper, we investigate the structure and the success of interdisciplinary scientific research teams. We examine the assembly factors using a sample of 1103 grant proposals submitted to two National Science Foundation interdisciplinary initiatives during a 3-year period, including both awarded and non-awarded proposals. The results indicate that individuals' likelihood of collaboration on a proposal is higher among those with longer tenure, lower institutional tier, lower H-index, and with higher levels of prior co-authorship and citation relationships. However, successful proposals have a little bit different relational patterns: individuals' likelihood of collaboration is higher among those with lower institutional tier, lower H-index, (female) gender, higher levels of prior co-authorship, but with lower levels of prior citation relationships. (C) 2013 Elsevier Ltd. All rights reserved. C1 [Lungeanu, Alina; Huang, Yun; Contractor, Noshir S.] Northwestern Univ, Evanston, IL 60208 USA. RP Lungeanu, A (reprint author), Northwestern Univ, Evanston, IL 60208 USA. 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RP Ruiz-Castillo, J (reprint author), Univ Carlos III, Dept Econ, Madrid, Spain. EM jrc@eco.uc3m.es CR Bornmann L, 2013, EMBO REP, V14, P226, DOI 10.1038/embor.2013.9 Bornmann L., 2013, NEXT GENERA IN PRESS Radicchi F, 2012, PLOS ONE, V7, DOI 10.1371/journal.pone.0033833 Crespo J. A., 2013, PLOS ONE, V8 Crespo J. 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PD JAN PY 2014 VL 8 IS 1 BP 25 EP 28 DI 10.1016/j.joi.2013.10.002 PG 4 WC Information Science & Library Science SC Information Science & Library Science GA AB4PH UT WOS:000331771900003 ER PT J AU Barrios, M Guilera, G Gomez-Benito, J AF Barrios, Maite Guilera, Georgina Gomez-Benito, Juana TI Impact and structural features of meta-analytical studies, standard articles and reviews in psychology: Similarities and differences SO JOURNAL OF INFORMETRICS LA English DT Article DE Meta-analysis; Review; Citations; Impact; Document type ID CITATION-INDEX DATABASE; PUBLICATION; JOURNALS AB Meta-analysis refers to the statistical methods used in research synthesis for combining and integrating results from individual studies. In this regard meta-analytical studies share with narrative reviews the goal of synthesizing the scientific literature on a particular topic, while as in the case of standard articles they present new results. This study aims to identify the potential similarities and differences between meta-analytical studies, reviews and standard articles as regards their impact and structural features in the field of psychology. To this end a random sample of 335 examples of each type of document were selected from the Thomson Reuters Web of Science database. The results showed that meta-analytical studies receive more citations than do both reviews and standard articles. All three types of documents showed a similar pattern in terms of institutional collaboration, while reviews and meta-analytical studies had a similar number of authors per document. However, reviews had a greater number of references and pages than did meta-analytical studies. The implications of these results for the scientific community are discussed. (c) 2013 Elsevier Ltd. All rights reserved. C1 [Barrios, Maite; Guilera, Georgina; Gomez-Benito, Juana] Univ Barcelona, Dept Behav Sci Methods, Barcelona 08035, Spain. [Guilera, Georgina; Gomez-Benito, Juana] Univ Barcelona, Inst Brain Cognit & Behav IR3C, Barcelona 08035, Spain. RP Barrios, M (reprint author), Univ Barcelona, Dept Behav Sci Methods, Passeig Vall dHebron 171, Barcelona 08035, Spain. 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F. J., 2005, MEASUREMENT INTERDIS, V3, P50, DOI 10.1207/s15366359mea0301_7 Vieira ES, 2010, J INFORMETR, V4, P1, DOI 10.1016/j.joi.2009.06.002 Vieira ES, 2011, SCIENTOMETRICS, V89, P631, DOI 10.1007/s11192-011-0469-8 NR 29 TC 2 Z9 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 1751-1577 EI 1875-5879 J9 J INFORMETR JI J. Informetr. PY 2013 VL 7 IS 2 BP 478 EP 486 DI 10.1016/j.joi.2013.01.012 PG 9 WC Information Science & Library Science SC Information Science & Library Science GA 136PY UT WOS:000318377100025 ER PT J AU Burrell, QL AF Burrell, Quentin L. TI The h-index: A case of the tail wagging the dog? SO JOURNAL OF INFORMETRICS LA English DT Article DE Citation distribution; Publication-citation process; Geometric distribution; Non-linear equations; Quasi h-index; h-Index profile ID HIRSCH-INDEX AB From the way that it was initially defined (Hirsch, 2005), the h-index naturally encourages focus on the most highly cited publications of an. author and this in turn has led to (predominantly) a rank-based approach to its investigation. However, Hirsch (2005) and Burrell (2007a) both adopted a frequency-based approach leading to general conjectures regarding the relationship between the h-index and the author's publication and citation rates as well as his/her career length. Here we apply the distributional results of Burrell (2007a, 2013b) to three published data sets to show that a good estimate of the h-index can often be obtained knowing only the number of publications and the number of citations. (Exceptions can occur when an author has one or more "outliers" in the upper tail of the citation distribution.) In other words, maybe the main body of the distribution determines the h-index, not the wild wagging of the tail. Furthermore, the simple geometric distribution turns out to be the key. (C) 2013 Elsevier Ltd. All rights reserved. C1 [Burrell, Quentin L.] Katholieke Univ Leuven, Ctr R&D Monitoring ECOOM, Louvain, Belgium. RP Burrell, QL (reprint author), 119 Friary Pk, Ballabeg 1M9 4EX, Isle Of Man, England. EM quentinburrell@manx.net CR Burrell QL, 2014, SCIENTOMETRICS, V98, P725, DOI 10.1007/s11192-013-1018-4 Burrell QL, 2007, J INFORMETR, V1, P170, DOI 10.1016/j.joi.2007.01.003 Egghe L, 2012, J AM SOC INF SCI TEC, V63, P1048, DOI 10.1002/asi.22617 Egghe L, 2010, ANNU REV INFORM SCI, V44, P65 Egghe L, 2006, SCIENTOMETRICS, V69, P131, DOI 10.1007/s11192-006-0144-7 Egghe L, 2006, SCIENTOMETRICS, V69, P121, DOI 10.1007/s11192-006-0143-8 Glanzel W, 2010, SCIENTOMETRICS, V83, P697, DOI 10.1007/s11192-009-0124-9 Hirsch JE, 2005, P NATL ACAD SCI USA, V102, P16569, DOI 10.1073/pnas.0507655102 Jin B., 2006, SCI FOCUS, V1, P8 Rousseau R, 2013, J INFORMETR, V7, P294, DOI 10.1016/j.joi.2012.11.012 Sangwal K, 2013, J INFORMETR, V7, P36, DOI 10.1016/j.joi.2012.09.002 Ye FY, 2011, J AM SOC INF SCI TEC, V62, P205, DOI 10.1002/asi.21456 Ye FY, 2009, SCIENTOMETRICS, V81, P493, DOI 10.1007/s11192-008-2169-6 NR 13 TC 2 Z9 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 1751-1577 EI 1875-5879 J9 J INFORMETR JI J. Informetr. PY 2013 VL 7 IS 4 BP 774 EP 783 DI 10.1016/j.joi.2013.06.004 PG 10 WC Information Science & Library Science SC Information Science & Library Science GA 264ZV UT WOS:000327920400002 ER PT J AU Franceschini, F Galetto, M Maisano, D Mastrogiacomo, L AF Franceschini, Fiorenzo Galetto, Maurizio Maisano, Domenico Mastrogiacomo, Luca TI An informetric model for the success-index SO JOURNAL OF INFORMETRICS LA English DT Article DE Lotka's law; h-Index; success-Index; Information production processes ID SOCIAL NETWORKS; CROWN INDICATOR; CITATIONS; JOURNALS AB Based on an idea by Kosmulski, Franceschini et al. (2012, Scientometrics 92( 3), 621-641) propose to classify a publication as "successful" when it receives more citations than a specific comparison term (CT). In the intention of the authors CT should be a suitable estimate of the number of citations that a publication - in a certain scientific context and period of time - should potentially achieve. According to this definition, the success-index is defined as the number of successful papers, among a group of publications examined, such as those associated to a scientist or a journal. In the first part of the paper, the success-index is recalled, discussing its properties and limitations. Next, relying on the theory of Information Production Processes (IPPs), an informetric model of the index is formulated, for a better comprehension of the index and its properties. Particular emphasis is given to a theoretical sensitivity analysis of the index. (C) 2012 Elsevier Ltd. All rights reserved. C1 [Franceschini, Fiorenzo; Galetto, Maurizio; Maisano, Domenico; Mastrogiacomo, Luca] Politecn Torino, DIGEP Dept Management & Prod Engn, I-10129 Turin, Italy. RP Franceschini, F (reprint author), Politecn Torino, DIGEP Dept Management & Prod Engn, Corso Duca Abruzzi 24, I-10129 Turin, Italy. EM fiorenzo.franceschini@polito.it RI MAISANO, Domenico/B-4301-2010 OI MAISANO, Domenico/0000-0002-8154-4469 CR [Anonymous], 2008, JCGM1002008 Bornmann L., 2012, J INFORMETRICS, V6 Casella G., 2001, STAT INFERENCE, P240 Egghe L, 2007, J AM SOC INF SCI TEC, V58, P702, DOI 10.1002/asi.20524 Egghe L., 1990, INTRO INFORMETRICS Q EGGHE L, 1990, J INFORM SCI, V16, P17, DOI 10.1177/016555159001600105 Egghe L, 2005, LIBR INFORM SCI SER, P1 Egghe L, 2006, SCIENTOMETRICS, V69, P121, DOI 10.1007/s11192-006-0143-8 Egghe L, 2009, B BELG MATH SOC-SIM, V16, P689 Egghe L, 2005, J AM SOC INF SCI TEC, V56, P664, DOI 10.1002/asi.20157 Franceschini F, 2010, EUR J OPER RES, V203, P494, DOI 10.1016/j.ejor.2009.08.001 Franceschini F, 2010, J INFORMETR, V4, P503, DOI 10.1016/j.joi.2010.05.004 Franceschini F, 2007, MANAGEMENT MEASUREME Franceschini F, 2012, SCIENTOMETRICS, V92, P621, DOI 10.1007/s11192-011-0570-z GARFIELD E, 1979, SCIENTOMETRICS, V1, P359, DOI 10.1007/BF02019306 Glanzel W, 2011, J INF SCI, V37, P40, DOI 10.1177/0165551510392316 Hirsch JE, 2005, P NATL ACAD SCI USA, V102, P16569, DOI 10.1073/pnas.0507655102 ISI Web of Knowledge, 2012, ESS SCI IND Jackson MO, 2007, AM ECON REV, V97, P890, DOI 10.1257/aer.97.3.890 Kosmulski M, 2011, J INFORMETR, V5, P481, DOI 10.1016/j.joi.2011.03.001 Leydesdorff L, 2011, J AM SOC INF SCI TEC, V62, P1146, DOI 10.1002/asi.21511 Lotka A.J., 1926, J WASHINGTON ACAD SC, V16, P317 Moed HF, 2010, J INFORMETR, V4, P265, DOI 10.1016/j.joi.2010.01.002 Moed HF, 2010, J INFORMETR, V4, P436, DOI 10.1016/j.joi.2010.03.009 Montgomery D. 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Nunez-Anton, Vicente TI Correlation between variables subject to an order restriction, with application to scientometric indices SO JOURNAL OF INFORMETRICS LA English DT Article DE Correlation; Order restrictions; Sampling distribution; Significance testing; Simulation ID CORRELATION-COEFFICIENT; T-TEST; ROBUSTNESS; NORMALITY; CANCER AB Variables subject to an order restriction, for instance Y <= X, have a bivariate distribution over a non-rectangular joint domain that entails a non-null and potentially large structural relation even if the variables show no association (in the sense that particular ranges of values of X do not co-occur with particular ranges of values of Y). Order restrictions affect a number of scientometric indices (including the h index and its variants) that are routinely subjected to correlational analyses to assess whether they provide redundant information, but these correlations are contaminated by the structural relation. This paper proposes an alternative definition of association between variables subject to an order restriction that eliminates their structural relation and reverts to the conventional definition when applied to variables that are not subject to order restrictions. This alternative definition is illustrated in a number of theoretical cases and it is also applied to empirical data involving scientometric indices subject to an order restriction. A test statistic is also derived which allows testing for the significance of an association between variables subject to an order restriction. (c) 2013 Elsevier Ltd. All rights reserved. C1 [Garcia-Perez, Miguel A.] Univ Complutense, Fac Psicol, Dept Metodol, Madrid 28223, Spain. [Nunez-Anton, Vicente] Univ Pais Vasco UPV EHU, Fac Ciencias Econ & Empresariales, Dept Econometria & Estadist EA 3, Bilbao 48015, Spain. RP Garcia-Perez, MA (reprint author), Univ Complutense, Fac Psicol, Madrid 28223, Spain. 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PY 2013 VL 7 IS 2 BP 542 EP 554 DI 10.1016/j.joi.2013.01.010 PG 13 WC Information Science & Library Science SC Information Science & Library Science GA 136PY UT WOS:000318377100031 ER PT J AU Hossain, L Murshed, ST Uddin, S AF Hossain, Liaquat Murshed, Shahriar Tanvir Uddin, Shahadat TI Communication network dynamics during organizational crisis SO JOURNAL OF INFORMETRICS LA English DT Article DE Communication network; Organizational crisis; Social network analysis; Actor centrality; Reciprocity; Transitivity; Cliques; Centralization ID SOCIAL NETWORKS; COLLECTIVE ACTION; COMPLEX NETWORKS; PERFORMANCE; CONSEQUENCES; EXPLORATION; RECIPROCITY; INTEGRATION; STRATEGIES; BEHAVIOR AB Communication network is a personal or professional set of relationships between individuals or organizations. In other words, it is a pattern of contacts which are created due to the flow of information among the participating actors. The flow of information establishes various types of relationships among the participating entities. These relationships eventually form an overall pattern that could form a gestalt of the total structure within organizational context. In this paper, we analyze the changing communications structure in order to investigate the patterns associated with the final stages of organizational crisis. Organizational crisis has been defined as organizational mortality, organizational death, organizational exit, bankruptcy, decline, retrenchment and failure to characterize various forms of organizational crisis. We draw on theoretical perspectives on organizational crisis proposed by social network analysts and other sociologists to test 5 key propositions on the changes in the network communication structure associated with organizational crisis: (1) a few actors, who are prominent or more active, will become central during the organizational crisis period; (2) reciprocity within the organizational communication network will increase during crisis period; (3) organizational communication network becomes less transitive as organizations experience crisis; (4) number of cliques increases in a communication network as organizations are going through crisis; and (5) communication network becomes increasingly centralized as organizations go through crisis. (C) 2012 Elsevier Ltd. All rights reserved. C1 [Hossain, Liaquat; Murshed, Shahriar Tanvir; Uddin, Shahadat] Univ Sydney, Fac Engn & Informat Technol, Complex Syst Res & Project Management Program, Sydney, NSW 2006, Australia. 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Vinay TI HTTP 404-page (not) found: Recovery of decayed URL citations SO JOURNAL OF INFORMETRICS LA English DT Article DE URL citations; Decay; Half-life; HTTP-404: page not found; Wayback machine ID UNIFORM RESOURCE LOCATORS; INTERNET REFERENCES; WEB REFERENCES; LINK ROT; JOURNALS; ACCESSIBILITY; PERSISTENCE; INFORMATION; MEDLINE; AVAILABILITY AB Study investigates the availability, persistence and half life of URL citations cited in two Indian LIS journals articles published between 2002 and 2010. This study also investigates how researchers can resurrect lapsed URL citations cited in research articles, using Wayback machine. A total of 1290 URLs cited in 472 research articles published in Indian LIS journals spanning a period of 9 years (2002-2010) were extracted. Study found that only 18.91% (1290 out of 6820) of URLs cited in these journal articles. 39.84% of URL citations were not accessible and remaining 60.15% of URL citations were still accessible. The HTTP 404 error message-" page not found" was the overwhelming message encountered and represented 54.86% of all HTTP error messages. However 51.06% URLs were recovered from HTTP 404 error message. Study also noticed that the half-life of URL citations was increased from 6.33 years to 13.85 years after recovering missing URLs from Wayback machine. (C) 2012 Elsevier Ltd. All rights reserved. C1 [Kumar, B. T. Sampath] Tumkur Univ, Dept Studies & Res Lib & Informat Sci, Tumkur, Karnataka, India. [Kumar, D. Vinay] Kuvempu Univ, Dept Studies & Res Lib & Informat, Shivamogga, Karnataka, India. RP Kumar, BTS (reprint author), Tumkur Univ, Dept Studies & Res Lib & Informat Sci, Tumkur, Karnataka, India. 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A cross-country analysis using interlinking data SO JOURNAL OF INFORMETRICS LA English DT Article DE Core/periphery networks; Higher education institutions; Weblinks; Geography; Network centrality ID WEB SITE INTERLINKING; ACADEMIC WEB; CORE/PERIPHERY STRUCTURES; RESEARCH COLLABORATION; NETWORK STRUCTURE; LINK ANALYSIS; PATTERNS; EUROPE; ORGANIZATIONS; COMMUNICATION AB This paper presents a comparative analysis of the structure of national higher education networks in six European countries using interlinking data. We show that national HE systems display a common core-periphery structure, which we explain by the lasting reputational differences in science, as well as the process of expansion and integration of HE systems. Furthermore, we demonstrate that centrality in national networks (coreness) is associated with organizational characteristics, reflecting that interlinking is motivated by access to resources and the status of the organizations concerned, and that national policies impact network structures by influencing the level of inequality in the distribution of resources and status. Finally, we show that, as an outcome of the core-periphery structure, the strength of ties between two HEIs is largely determined by their individual coreness, while the impact of distance is too small-scale to alter the network structure generated by organizational attributes. (C) 2013 Elsevier Ltd. All rights reserved. C1 [Lepori, Benedetto] Univ Lugano, Fac Econ, Ctr Org Res, CH-6900 Lugano, Switzerland. [Barberio, Vitaliano] WU Univ, Dept Publ Management, Vienna, Austria. [Seeber, Marco] Univ Lugano, Ctr Org Res, CH-6900 Lugano, Switzerland. [Aguillo, Isidro] CSIC, Cybermetr Lab, Madrid, Spain. 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Thelwall, Mike TI Alphabetization and the skewing of first authorship towards last names early in the alphabet SO JOURNAL OF INFORMETRICS LA English DT Article DE Scientometrics; Research evaluation; Collaboration ID ORDER; PUBLICATION; ECONOMICS; QUALITY; SURNAME; CREDIT AB The practice of listing co-author surnames in alphabetical order, irrespective of their contribution, can make it difficult to effectively allocate research credit to authors. This article compares the percentages of articles with co-authors in alphabetical order (alphabetization) for two-author, three-author and four-author articles in eighteen social sciences in 1995 and 2010 to assess how widespread this practice is. There is some degree of alphabetization in all disciplines except one but the level varies substantially between disciplines. This level is increasing slightly over time, on average, but it has increased substantially in a few disciplines and decreased in others, showing that the practice of alphabetization is not fading away. A high correlation between alphabetical order and the proportion of first authors near the beginning of the alphabet confirms that high percentages of alphabetical order could affect the appropriate allocation of research credit. Similar patterns were found for science and the humanities. Finally, since some degree of alphabetization is almost universal in social science disciplines, this practice may be affecting careers throughout the social sciences and hence seems indefensible. (C) 2013 Elsevier Ltd. All rights reserved. C1 [Levitt, Jonathan M.] Univ Loughborough, Dept Informat Sci, Loughborough LE11 3TU, Leics, England. [Levitt, Jonathan M.; Thelwall, Mike] Wolverhampton Univ, Sch Technol, Stat Cybermetr Res Grp, Wolverhampton WV1 1LY, W Midlands, England. 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PY 2013 VL 7 IS 3 BP 575 EP 582 DI 10.1016/j.joi.2013.03.002 PG 8 WC Information Science & Library Science SC Information Science & Library Science GA 210UH UT WOS:000323859700001 ER PT J AU Leydesdorff, L AF Leydesdorff, Loet TI Does the specification of uncertainty hurt the progress of scientometrics? SO JOURNAL OF INFORMETRICS LA English DT Letter ID SIGNIFICANCE TESTS; CITATION ANALYSIS; RELIABILITY; PAPER C1 Univ Amsterdam, Amsterdam Sch Commun Res ASCoR, NL-1012 CX Amsterdam, Netherlands. RP Leydesdorff, L (reprint author), Univ Amsterdam, Amsterdam Sch Commun Res ASCoR, Kloveniersburgwal 48, NL-1012 CX Amsterdam, Netherlands. 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Informetr. PY 2013 VL 7 IS 4 BP 859 EP 860 DI 10.1016/j.joi.2013.08.003 PG 2 WC Information Science & Library Science SC Information Science & Library Science GA 264ZV UT WOS:000327920400010 ER PT J AU Li, YR Ruiz-Castillo, J AF Li, Yunrong Ruiz-Castillo, Javier TI The comparison of normalization procedures based on different classification systems SO JOURNAL OF INFORMETRICS LA English DT Article DE Citation practices; Normalization procedures; Classification systems; Citation inequality ID RESEARCH PERFORMANCE; FIELD-NORMALIZATION; SCIENTOMETRIC INDICATORS; SCIENTIFIC JOURNALS; CITATION IMPACT; CROSS-FIELD; SCIENCE; PUBLICATIONS; SCORES; SCALES AB In this paper, we develop a novel methodology within the IDCP measuring framework for comparing normalization procedures based on different classification systems of articles into scientific disciplines. Firstly, we discuss the properties of two rankings, based on a graphical and a numerical approach, for the comparison of any pair of normalization procedures using a single classification system for evaluation purposes. Secondly, when the normalization procedures are based on two different classification systems, we introduce two new rankings following the graphical and the numerical approaches. Each ranking is based on a double test that assesses the two normalization procedures in terms of the two classification systems on which they depend. Thirdly, we also compare the two normalization procedures using a third, independent classification system for evaluation purposes. In the empirical part of the paper we use: (i) a classification system consisting of 219 sub-fields identified with the Web of Science subject-categories; an aggregate classification system consisting of 19 broad fields, as well as a systematic and a random assignment of articles to sub-fields with the aim of maximizing or minimizing differences across sub-fields; (ii) four normalization procedures that use the field or sub-field mean citations of the above four classification systems as normalization factors; and (iii) a large dataset, indexed by Thomson Reuters, in which 4.4 million articles published in 1998-2003 with a five-year citation window are assigned to sub-fields using a fractional approach. The substantive results concerning the comparison of the four normalization procedures indicate that the methodology can be useful in practice. (C) 2013 Elsevier Ltd. All rights reserved. C1 [Li, Yunrong; Ruiz-Castillo, Javier] Univ Carlos III, Dept Econ, Madrid, Spain. 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PY 2013 VL 7 IS 4 BP 945 EP 958 DI 10.1016/j.joi.2013.09.005 PG 14 WC Information Science & Library Science SC Information Science & Library Science GA 264ZV UT WOS:000327920400019 ER PT J AU Lin, CS Huang, MH Chen, DZ AF Lin, Chi-Shiou Huang, Mu-Hsuan Chen, Dar-Zen TI The influences of counting methods on university rankings based on paper count and citation count SO JOURNAL OF INFORMETRICS LA English DT Article DE Counting method; University ranking; Research evaluation; Paper count; Citation count ID PUBLICATION; PRODUCTIVITY AB In an age of intensifying scientific collaboration, the counting of papers by multiple authors has become an important methodological issue in scientometric based research evaluation. Especially, how counting methods influence institutional level research evaluation has not been studied in existing literatures. In this study, we selected the top 300 universities in physics in the 2011 HEEACT Ranking as our study subjects. We compared the university rankings generated from four different counting methods (i.e. whole counting, straight counting using first author, straight counting using corresponding author, and fractional counting) to show how paper counts and citation counts and the subsequent university ranks were affected by counting method selection. The counting was based on the 1988-2008 physics papers records indexed in ISI WoS. We also observed how paper and citation counts were inflated by whole counting. The results show that counting methods affected the universities in the middle range more than those in the upper or lower ranges. Citation counts were also more affected than paper counts. The correlation between the rankings generated from whole counting and those from the other methods were low or negative in the middle ranges. Based on the findings, this study concluded that straight counting and fractional counting were better choices for paper count and citation count in the institutional level research evaluation. (C) 2013 Elsevier Ltd. All rights reserved. C1 [Lin, Chi-Shiou; Huang, Mu-Hsuan] Natl Taiwan Univ, Dept Lib & Informat Sci, Taipei 10617, Taiwan. [Chen, Dar-Zen] Natl Taiwan Univ, Dept Mech Engn, Taipei 10764, Taiwan. [Chen, Dar-Zen] Natl Taiwan Univ, Inst Ind Engn, Taipei 10764, Taiwan. RP Huang, MH (reprint author), Natl Taiwan Univ, Dept Lib & Informat Sci, 1 Sect 4,Roosevelt Rd, Taipei 10617, Taiwan. 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PY 2013 VL 7 IS 3 BP 611 EP 621 DI 10.1016/j.joi.2013.03.007 PG 11 WC Information Science & Library Science SC Information Science & Library Science GA 210UH UT WOS:000323859700005 ER PT J AU Liu, X Jiang, TT Ma, FC AF Liu, Xiang Jiang, Tingting Ma, Feicheng TI Collective dynamics in knowledge networks: Emerging trends analysis SO JOURNAL OF INFORMETRICS LA English DT Article DE Knowledge networks; Dynamical network; Collective dynamics; Emerging trends; Research front ID RESEARCH FRONTS; SCIENTIFIC LITERATURES; COCITATION ANALYSIS; COMPLEX NETWORKS; SCIENCE; CITATION; SYNCHRONIZATION; SPECIALTIES; CENTRALITY; ARTICLES AB This paper addresses emerging trends in the collective dynamics found in knowledge networks, those networks composed of the relationships among knowledge sources, such as citation networks and keyword networks. In studying the formation and detection of new trends in the process of knowledge evolution, we use the collective dynamics approach to construct a network of knowledge clusters based on citation clustering. This approach explores the processes and rules of new trends emerging in knowledge clusters by examining the continuous changes in keyword vectors found in the interaction and coordination between evolving knowledge clusters. In direct citation networks, the collective dynamics approach is found to be superior to the baseline method, especially in predicting small knowledge fields with less data and more uncertainties. (c) 2013 Elsevier Ltd. All rights reserved. C1 [Liu, Xiang; Jiang, Tingting; Ma, Feicheng] Wuhan Univ, Ctr Studies Informat Resources, Wuhan 430072, Peoples R China. [Liu, Xiang] Huazhong Normal Univ, Sch Informat Management, Wuhan 430079, Peoples R China. RP Ma, FC (reprint author), Wuhan Univ, Ctr Studies Informat Resources, Wuhan 430072, Peoples R China. 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Informetr. PY 2013 VL 7 IS 2 BP 425 EP 438 DI 10.1016/j.joi.2013.01.003 PG 14 WC Information Science & Library Science SC Information Science & Library Science GA 136PY UT WOS:000318377100020 ER PT J AU Nassiri, I Masoudi-Nejad, A Jalili, M Moeini, A AF Nassiri, Isar Masoudi-Nejad, Ali Jalili, Mahdi Moeini, Ali TI Normalized Similarity Index: An adjusted index to prioritize article citations SO JOURNAL OF INFORMETRICS LA English DT Article DE Bibliographic coupling; Co-citation; Citation network; Similarity index; Weighted citation ID AUTHOR COCITATION ANALYSIS; NETWORKS; RETRIEVAL; VISUALIZATION; PAGERANK; SCIENCE AB One of the main applications of citation is to find articles that are relevant to a particular article. However, not all citations are equally relevant to the target article. This paper presents an approach to identify the most relevant citation(s). To this end, the Normalized Similarity Index (NSI) is proposed to quantify the similarity between the source and target of a citation base on the co-citations and references shared by them. To validate the method, NSI was calculated for five citation networks and was compared with the peer review grades for the relevancy between the source and the target articles. The results showed a significant correlation between the NSI ranks and those of peer review. Also, combined linkage (CL) and weighted direct citation (WDC) were calculated from the same data. According to the results of comparison between the NSI with other similarity measures, in most cases, NSI did better than others at reproducing the peer rankings. Our principal conclusion is that the NSI can be used to prioritize the citations of given highly cited article, and represent knowledge flow from the target article. (C) 2012 Elsevier Ltd. All rights reserved. C1 [Nassiri, Isar; Masoudi-Nejad, Ali] Univ Tehran, Inst Biochem & Biophys, Lab Syst Biol & Bioinformat LBB, Tehran, Iran. [Jalili, Mahdi] Sharif Univ Technol, Dept Comp Engn, Tehran, Iran. [Moeini, Ali] Univ Tehran, Coll Engn, Dept Algorithms & Computat, Tehran, Iran. RP Nassiri, I (reprint author), Univ Tehran, Inst Biochem & Biophys, Lab Syst Biol & Bioinformat LBB, Tehran, Iran. EM isarnassiri@ut.ac.ir; amasoudin@ibb.ut.ac.ir CR Ahlgren P, 2003, J AM SOC INF SCI TEC, V54, P550, DOI 10.1002/asi.10242 Batagelj V, 2002, LECT NOTES COMPUT SC, V2265, P477 BICHTELER J, 1980, J AM SOC INFORM SCI, V31, P278, DOI 10.1002/asi.4630310408 Boyack KW, 2010, J AM SOC INF SCI TEC, V61, P2389, DOI 10.1002/asi.21419 Carmeli C, 2005, NEUROIMAGE, V25, P339, DOI 10.1016/j.neuroimage.2004.11.049 Corder G. 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Informetr. PD JAN PY 2013 VL 7 IS 1 BP 91 EP 98 DI 10.1016/j.joi.2012.08.006 PG 8 WC Information Science & Library Science SC Information Science & Library Science GA 065BG UT WOS:000313121300010 ER PT J AU Rousseau, R Liu, YX Guns, R AF Rousseau, Ronald Liu, Yuxian Guns, Raf TI Mathematical properties of Q-measures SO JOURNAL OF INFORMETRICS LA English DT Article DE Network theory; Q-measures; Betweenness centrality ID BETWEENNESS CENTRALITY; NETWORK ANALYSIS; DIFFUSION AB Q-measures are network indicators that gauge a node's brokerage role between different groups in the network. Previous studies have focused on their definition for different network types and their practical application. Little attention has, however, been paid to their theoretical and mathematical characterization. In this article we contribute to a better understanding of Q-measures by studying some of their mathematical properties in the context of unweighted, undirected networks. An external Q-measure complementing the previously defined local and global Q-measure is introduced. We prove a number of relations between the values of the global, the local and the external Q-measure and betweenness centrality, and show how the global Q-measure can be rewritten as a convex decomposition of the local and external Q-measures. Furthermore, we formally characterize when Q-measures obtain their maximal value. It turns out that this is only possible in a limited number of very specific circumstances. (C) 2013 Elsevier Ltd. All rights reserved. C1 [Rousseau, Ronald; Guns, Raf] Univ Antwerp, IBW, Inst Educ & Informat Sci, B-2000 Antwerp, Belgium. [Rousseau, Ronald] Assoc KU Leuven, VIVES KHBO, Fac Engn Technol, B-8400 Oostende, Belgium. [Rousseau, Ronald] Katholieke Univ Leuven, B-3000 Louvain, Belgium. [Liu, Yuxian] Tongji Univ, Lib Tongji Univ, Shanghai 200092, Peoples R China. RP Guns, R (reprint author), Univ Antwerp, IBW, Inst Educ & Informat Sci, Venusstr 35, B-2000 Antwerp, Belgium. EM ronald.rousseau@ua.ac.be; yxliu@lib.tongji.edu.cn; raf.guns@ua.ac.be RI Guns, Raf/D-6762-2012 OI Guns, Raf/0000-0003-3129-0330 CR Anthonisse J. M., 1971, TECHNICAL REPORT BN Brandes U, 2008, SOC NETWORKS, V30, P136, DOI 10.1016/j.socnet.2007.11.001 Chen L, 2008, SCIENTOMETRICS, V74, P57, DOI 10.1007/s11192-008-0103-6 Everett MG, 1999, J MATH SOCIOL, V23, P181 Flom P. 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Informetr. PY 2013 VL 7 IS 3 BP 737 EP 745 DI 10.1016/j.joi.2013.06.002 PG 9 WC Information Science & Library Science SC Information Science & Library Science GA 210UH UT WOS:000323859700019 ER PT J AU Schall, D AF Schall, Daniel TI Measuring contextual partner importance in scientific collaboration networks SO JOURNAL OF INFORMETRICS LA English DT Article DE Scientific collaboration; Hubs and authorities; Contextual importance; Personalized PageRank; Sociability ID SCIENCE AB Scientific collaboration commonly takes place in a global and competitive environment. Coalitions and consortia are formed among universities, companies and research institutes to apply for research grants and to perform joint projects. In such a competitive environment, individual institutes may be strategic partners or competitors. Measures to determine partner importance have practical applications such as comparison and rating of competitors, reputation evaluation or performance evaluation of companies and institutes. Many network-centric metrics exist to measure the important of individuals or companies in social and collaborative networks. Here we present a novel context-based metric to measure the importance of partners in scientific collaboration networks. Well-established graph models such as the notion of hubs and authorities provide the basis for this work and are systematically extended to a flexible, context-aware network importance measure. (C) 2013 Elsevier Ltd. All rights reserved. C1 Siemens Corp Technol, A-1211 Vienna, Austria. RP Schall, D (reprint author), Siemens Corp Technol, Siemensstr 90, A-1211 Vienna, Austria. EM daniel.schall@siemens.com CR Anagnostopoulos A, 2012, P 21 INT C WORLD WID, P839 Chakrabarti S, 2007, P 16 INT C WORLD WID, P571, DOI 10.1145/1242572.1242650 Deng HB, 2009, KDD-09: 15TH ACM SIGKDD CONFERENCE ON KNOWLEDGE DISCOVERY AND DATA MINING, P239 Ding Y, 2011, J INFORMETR, V5, P187, DOI 10.1016/j.joi.2010.10.008 Fogaras D., 2005, INTERNET MATH, V2, P333, DOI DOI 10.1080/15427951.2005.10129104 Fu F, 2008, PHYS REV E, V78, DOI 10.1103/PhysRevE.78.026117 Guns R, 2011, SCIENTOMETRICS, V87, P133, DOI 10.1007/s11192-010-0332-3 Haveliwala T., 2003, ANAL COMP APPROACHES Haveliwala T. 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H., 2007, P ANN REV INF SCI TE, V4th, P2 Wagner CS, 2005, RES POLICY, V34, P1608, DOI 10.1016/j.respol.2005.08.002 NR 22 TC 2 Z9 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 1751-1577 J9 J INFORMETR JI J. Informetr. PY 2013 VL 7 IS 3 BP 730 EP 736 DI 10.1016/j.joi.2013.05.003 PG 7 WC Information Science & Library Science SC Information Science & Library Science GA 210UH UT WOS:000323859700018 ER PT J AU Schreiber, M AF Schreiber, Michael TI How relevant is the predictive power of the h-index? A case study of the time-dependent Hirsch index SO JOURNAL OF INFORMETRICS LA English DT Article DE h index; Hirsch index; Evaluation; Citation analysis AB The h-index has been shown to have predictive power. Here I report results of an empirical study showing that the increase of the h-index with time often depends for a long time on citations to rather old publications. This inert behavior of the h-index means that it is difficult to use it as a measure for predicting future scientific output. (c) 2013 Elsevier Ltd. All rights reserved. C1 Tech Univ Chemnitz, Inst Phys, D-09107 Chemnitz, Germany. RP Schreiber, M (reprint author), Tech Univ Chemnitz, Inst Phys, D-09107 Chemnitz, Germany. EM schreiber@physik.tu-chemnitz.de CR Acuna DE, 2012, NATURE, V489, P201, DOI 10.1038/489201a Bornmann L, 2012, MEASUREMENT, V10, P149 Dyson F, 2004, NATURE, V427, P297, DOI 10.1038/427297a Hirsch JE, 2007, P NATL ACAD SCI USA, V104, P19193, DOI 10.1073/pnas.0707962104 Hirsch JE, 2005, P NATL ACAD SCI USA, V102, P16569, DOI 10.1073/pnas.0507655102 Hu X., 2012, ISSI NEWSLETTER, V8, P53 Leeuwen T., 2008, RES EVALUAT, V17, P157 Lehmann S, 2008, SCIENTOMETRICS, V76, P369, DOI 10.1007/s11192-007-1868-8 NR 8 TC 2 Z9 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 1751-1577 J9 J INFORMETR JI J. Informetr. PY 2013 VL 7 IS 2 BP 325 EP 329 DI 10.1016/j.joi.2013.01.001 PG 5 WC Information Science & Library Science SC Information Science & Library Science GA 136PY UT WOS:000318377100010 ER PT J AU Seiler, C Wohlrabe, K AF Seiler, Christian Wohlrabe, Klaus TI Archetypal scientists SO JOURNAL OF INFORMETRICS LA English DT Article DE Archetypal analysis; Classification; Scientists; RePEc ID BIBLIOMETRIC INDICATORS AB We introduce archetypal analysis as a tool to describe and categorize scientists. This approach identifies typical characteristics of extreme ('archetypal') values in a multivariate data set. These positive or negative contextual attributes can be allocated to each scientist under investigation. In our application, we use a sample of seven bibliometric indicators for 29,083 economists obtained from the RePEc database and identify six archetypes. These are mainly characterized by ratios of published work and citations. We discuss applications and limitations of this approach. 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PY 2013 VL 7 IS 2 BP 345 EP 356 DI 10.1016/j.joi.2012.11.013 PG 12 WC Information Science & Library Science SC Information Science & Library Science GA 136PY UT WOS:000318377100012 ER PT J AU Silva, FN Rodrigues, FA Oliveira, ON Costa, LD AF Silva, F. N. Rodrigues, F. A. Oliveira, O. N., Jr. Costa, L. da F. TI Quantifying the interdisciplinarity of scientific journals and fields SO JOURNAL OF INFORMETRICS LA English DT Article DE Scientometry; Complex networks; Subjective phenomena quantification; Interdisciplinarity; Citation networks ID COMPLEX NETWORKS; BETWEENNESS CENTRALITY; DIVERSITY; SCIENCE; ALGORITHM; GRAPHS; INDEX AB There is an overall perception of increased interdisciplinarity in science, but this is difficult to confirm quantitatively owing to the lack of adequate methods to evaluate subjective phenomena. This is no different from the difficulties in establishing quantitative relationships in human and social sciences. In this paper we quantified the interdisciplinarity of scientific journals and science fields by using an entropy measurement based on the diversity of the subject categories of journals citing a specific journal. The methodology consisted in building citation networks using the Journal Citation Reports (R) database, in which the nodes were journals and edges were established based on citations among journals. The overall network for the 11-year period (1999-2009) studied was small-world and followed a power-law with exponential cutoff distribution with regard to the in-strength. Upon visualizing the network topology an overall structure of the various science fields could be inferred, especially their interconnections. We confirmed quantitatively that science fields are becoming increasingly interdisciplinary, with the degree of interdisplinarity (i.e. entropy) correlating strongly with the in-strength of journals and with the impact factor. (c) 2013 Elsevier Ltd. All rights reserved. C1 [Silva, F. N.; Oliveira, O. N., Jr.; Costa, L. da F.] Univ Sao Paulo, Inst Phys Sao Carlos, BR-05508 Sao Paulo, Brazil. [Rodrigues, F. A.] Univ Sao Paulo, Inst Math & Comp Sci, Natl Inst Sci & Technol Complex Syst, Rio De Janeiro, Brazil. RP Silva, FN (reprint author), POB 369, BR-13560970 Sao Paulo, Brazil. 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PY 2013 VL 7 IS 2 BP 469 EP 477 DI 10.1016/j.joi.2013.01.007 PG 9 WC Information Science & Library Science SC Information Science & Library Science GA 136PY UT WOS:000318377100024 ER PT J AU Vanderelst, D Speybroeck, N AF Vanderelst, Dieter Speybroeck, Niko TI Scientometrics reveals funding priorities in medical research policy SO JOURNAL OF INFORMETRICS LA English DT Article DE Research policy; Funding; Priorities; Medical research; Health impact; Burden of disease; Scientometrics; Low income; Poverty ID NEGLECTED TROPICAL DISEASES; GLOBAL BURDEN; FRAMEWORK; HEALTH AB Several studies have assessed whether funding of disease specific research is in line with their burden. The authors of these studies concluded that the burden of a disease was a good predictor for its associated research funding. However, previous analyses did not take into account diseases that mainly affect people living in low income regions, i.e. so-called diseases of poverty. Moreover, the analyses were only performed for the burden diseases cause in high income countries. We investigated whether the conclusions about the relationship between burden and funding still holds when (1) including diseases of poverty and (2) accounting for the burden of diseases in low income countries. We found that the relationship between the burden and the level of diseases specific funding decreases for people living in low income countries. We find the best predictor for the level of funding to be the mortality in high income countries. In contrast to previous studies, we were able to include more diseases into our analyses (74). This enabled us to discover differences in funding levels between and within groups of diseases. we found that research on cancers was over funded with respect to the associated burden. In contrast, diseases of poverty systematically receive less funding than would be expected based on their burden. Other groups of diseases (cardiovascular diseases and mental illnesses) contained both over and under funded diseases. (C) 2012 Elsevier Ltd. All rights reserved. C1 [Vanderelst, Dieter] Univ Antwerp, Fac Appl Econ, B-2000 Antwerp, Belgium. [Speybroeck, Niko] Catholic Univ Louvain, Fac Sante Publ, B-1348 Louvain, Belgium. RP Vanderelst, D (reprint author), Univ Antwerp, Fac Appl Econ, Prinsstr 13, B-2000 Antwerp, Belgium. 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N., 2002, MODERN APPL STAT S *WHO, 2011, NEGL ZOON DIS Yamey G, 2002, BRIT MED J, V325, P176, DOI 10.1136/bmj.325.7357.176 NR 23 TC 2 Z9 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 1751-1577 J9 J INFORMETR JI J. Informetr. PD JAN PY 2013 VL 7 IS 1 BP 240 EP 247 DI 10.1016/j.joi.2012.10.004 PG 8 WC Information Science & Library Science SC Information Science & Library Science GA 065BG UT WOS:000313121300028 ER PT J AU Vaughan, L Yang, RB AF Vaughan, Liwen Yang, Rongbin TI Web traffic and organization performance measures: Relationships and data sources examined SO JOURNAL OF INFORMETRICS LA English DT Article DE Web traffic analysis; Webometrics; Performance measurements; Data quality assessment ID WEBOMETRICS; LINKS AB Unlike Web hyperlink data, Web traffic data have not yet been the focus of considerable study in Webometrics research. The relationships between Web traffic data and academic/business performance measures have not been as firmly established as the relationships between Web hyperlink data and such performance measures. Although various traffic data sources exist, few studies have examined and compared their relative merits. We carried out a study that aimed to address this lack. We selected groups of universities and businesses from the U.S. and China and collected their Web traffic data from three sources: Alexa Internet, Google Trends for Websites, and Compete. We found significant correlations between Web traffic data and organizational performance measures, specifically academic quality for universities and financial variables for businesses. We also examined the characteristics of the three data sources and compared their usefulness. We found that Alexa Internet outperformed the others. (C) 2013 Elsevier Ltd. All rights reserved. C1 [Vaughan, Liwen] Univ Western Ontario, Fac Informat & Media Studies, London, ON N6A 3K7, Canada. [Yang, Rongbin] Inst Sci & Tech Informat Shanghai, Shanghai, Peoples R China. RP Vaughan, L (reprint author), Univ Western Ontario, Fac Informat & Media Studies, London, ON N6A 3K7, Canada. EM lvaughan@uwo.ca; rbyang@libnet.sh.cn CR Aguillo IF, 2006, J AM SOC INF SCI TEC, V57, P1296, DOI 10.1002/asi.20433 Alexa, 2012, AL TRAFF RANK Almind TC, 1997, J DOC, V53, P404, DOI 10.1108/EUM0000000007205 Bar-Ilan J, 2005, J INF SCI, V31, P297, DOI 10.1177/0165551505054175 Bar-Ilan J, 2005, INFORM PROCESS MANAG, V41, P973, DOI 10.1016/j.ipm.2004.02.005 Bar-Ilan J, 2008, J INFORMETR, V2, P1, DOI 10.1016/j.joi.2007.11.001 Callaway S. 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Informetr. PY 2013 VL 7 IS 3 BP 699 EP 711 DI 10.1016/j.joi.2013.04.005 PG 13 WC Information Science & Library Science SC Information Science & Library Science GA 210UH UT WOS:000323859700014 ER PT J AU Waltman, L van Eck, NJ Wouters, P AF Waltman, Ludo van Eck, Nees Jan Wouters, Paul TI Counting publications and citations: Is more always better? SO JOURNAL OF INFORMETRICS LA English DT Article DE Bibliometric index; Citation; Highly cited publication; Modeling; Scientific impact ID HIGHLY CITED PAPERS; INDICATORS; INDEX AB Is more always better? We address this question in the context of bibliometric indices that aim to assess the scientific impact of individual researchers by counting their number of highly cited publications. We propose a simple model in which the number of citations of a publication depends not only on the scientific impact of the publication but also on other 'random' factors. Our model indicates that more need not always be better. It turns out that the most influential researchers may have a systematically lower performance, in terms of highly cited publications, than some of their less influential colleagues. The model also suggests an improved way of counting highly cited publications. (C) 2013 Elsevier Ltd. All rights reserved. C1 [Waltman, Ludo; van Eck, Nees Jan; Wouters, Paul] Leiden Univ, Ctr Sci & Technol Studies, NL-2300 RA Leiden, Netherlands. RP Waltman, L (reprint author), Leiden Univ, Ctr Sci & Technol Studies, NL-2300 RA Leiden, Netherlands. EM waltmanlr@cwts.leidenuniv.nl; ecknjpvan@cwts.leidenuniv.nl; p.twouters@cwts.leidenuniv.nl RI van Eck, Nees Jan/B-6042-2008 OI van Eck, Nees Jan/0000-0001-8448-4521 CR Bornmann L, 2013, J INFORMETR, V7, P100, DOI 10.1016/j.joi.2012.09.004 Bornmann L, 2008, J DOC, V64, P45, DOI 10.1108/00220410810844150 DIEKS D, 1976, SOC STUD SCI, V6, P247, DOI 10.1177/030631277600600204 Hirsch JE, 2005, P NATL ACAD SCI USA, V102, P16569, DOI 10.1073/pnas.0507655102 Leydesdorff L, 2011, J AM SOC INF SCI TEC, V62, P1370, DOI 10.1002/asi.21534 Marchant T, 2009, J AM SOC INF SCI TEC, V60, P1132, DOI 10.1002/asi.21059 MARTIN BR, 1983, RES POLICY, V12, P61, DOI 10.1016/0048-7333(83)90005-7 Moed HF, 2005, INFORM SCI KNOWL MAN, V9, P1, DOI 10.1007/1-4020-3714-7 MORAVCSIK MJ, 1975, SOC STUD SCI, V5, P86, DOI 10.1177/030631277500500106 Nicolaisen J, 2007, ANNU REV INFORM SCI, V41, P609, DOI 10.1002/aris.2007.1440410120 PLOMP R, 1990, SCIENTOMETRICS, V19, P185, DOI 10.1007/BF02095346 PLOMP R, 1994, SCIENTOMETRICS, V29, P377, DOI 10.1007/BF02033446 PRICE DJD, 1976, J AM SOC INFORM SCI, V27, P292, DOI 10.1002/asi.4630270505 Ravallion M, 2011, SCIENTOMETRICS, V88, P321, DOI 10.1007/s11192-011-0375-0 Simkin Mikhail V., 2003, COMPLEX SYSTEMS, V14, P269 Simkin MV, 2005, SCIENTOMETRICS, V62, P367, DOI 10.1007/s11192-005-0028-2 Van Raan AFJ, 1998, SCIENTOMETRICS, V43, P129 Waltman L, 2013, J AM SOC INF SCI TEC, V64, P372, DOI 10.1002/asi.22775 Waltman L, 2012, J AM SOC INF SCI TEC, V63, P406, DOI 10.1002/asi.21678 NR 19 TC 2 Z9 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 1751-1577 EI 1875-5879 J9 J INFORMETR JI J. Informetr. PY 2013 VL 7 IS 3 BP 635 EP 641 DI 10.1016/j.joi.2013.04.001 PG 7 WC Information Science & Library Science SC Information Science & Library Science GA 210UH UT WOS:000323859700007 ER PT J AU Wu, J AF Wu, Jiang TI Investigating the universal distributions of normalized indicators and developing field-independent index SO JOURNAL OF INFORMETRICS LA English DT Article DE g-Index; h-Index; Field independence; Universality; Power-law distributions; Lognormal distributions ID HIRSCH-INDEX; H-INDEX; RESEARCHERS; AUTHORSHIP; IMPACT; OUTPUT AB Using the dataset based on Thomson Reuters Scientific "Web of Science" the distributions of some well-known indicators, such as h-index and g-index, were investigated, and different citation behaviors across different scientific fields resulting from their field dependences were found. To develop a field-independent index, two scaling methods, based on average citation of subject category and journal, were used to normalize the citation received by each paper of a certain author. The distributions of the generalized h-indices in different fields were found to follow a lognormal function with mean and standard deviation of approximately -0.8 and 0.8, respectively. A field-independent index fi-index was then proposed, and its distribution was found to satisfy a universal power-law function with scaling exponent alpha approaching 3.0. Both the power-law and the lognormal universality of the distributions verified the field independence of these indicators. However, deciding which of the scaling methods is the better one is necessary for the validation of the field-independent index. (C) 2012 Elsevier Ltd. All rights reserved. C1 Wuhan Univ, Sch Informat Management, Wuhan 430072, Hubei, Peoples R China. RP Wu, J (reprint author), Wuhan Univ, Sch Informat Management, Wuhan 430072, Hubei, Peoples R China. EM jiangwu.john@gmail.com CR Abramo G, 2012, J INFORMETR, V6, P645, DOI 10.1016/j.joi.2012.07.002 Aksnes DW, 2008, J AM SOC INF SCI TEC, V59, P838, DOI 10.1002/asi.20788 Alonso S, 2009, J INFORMETR, V3, P273, DOI 10.1016/j.joi.2009.04.001 Ball P., 2008, NATURE, DOI DOI 10.1038/NEWS.2008.1169 Batista PD, 2006, SCIENTOMETRICS, V68, P179, DOI 10.1007/s11192-006-0090-4 Bornmann L, 2009, J INFORMETR, V3, P27, DOI 10.1016/j.joi.2008.11.001 Castellano C, 2009, ARCH IMMUNOL THER EX, V57, P85, DOI 10.1007/s00005-009-0014-0 Clauset A, 2009, SIAM REV, V51, P661, DOI 10.1137/070710111 Egghe L., 2007, ISSI 11 INT C SCIENT Egghe L, 2010, ANNU REV INFORM SCI, V44, P65 Egghe L, 2006, SCIENTOMETRICS, V69, P131, DOI 10.1007/s11192-006-0144-7 Egghe L., 1990, INTRO INFORMETRICS Q Gurney T, 2012, SCIENTOMETRICS, V91, P435, DOI 10.1007/s11192-011-0589-1 Hirsch JE, 2010, SCIENTOMETRICS, V85, P741, DOI 10.1007/s11192-010-0193-9 Hirsch JE, 2005, P NATL ACAD SCI USA, V102, P16569, DOI 10.1073/pnas.0507655102 Hu XJ, 2010, J INF SCI, V36, P73, DOI 10.1177/0165551509348133 Iglesias JE, 2007, SCIENTOMETRICS, V73, P303, DOI 10.1007/s11192-007-1805-x Kang IS, 2009, INFORM PROCESS MANAG, V45, P84, DOI 10.1016/j.ipm.2008.06.006 Leydesdorff L., 2010, NORMALIZATION CWTS I Moed HF, 2005, INFORM SCI KNOWL MAN, V9, P1, DOI 10.1007/1-4020-3714-7 Opthof T, 2010, J INFORMETR, V4, P423, DOI 10.1016/j.joi.2010.02.003 Opthof T, 2011, SCIENTOMETRICS, V88, P1011, DOI 10.1007/s11192-011-0424-8 Petersen AM, 2010, PHYS REV E, V81, DOI 10.1103/PhysRevE.81.036114 Qiu JP, 2008, SCIENTOMETRICS, V77, P335, DOI 10.1007/s11192-008-1782-8 Radicchi F, 2008, P NATL ACAD SCI USA, V105, P17268, DOI 10.1073/pnas.0806977105 Radicchi F., 2009, PHYS REV E, V80 Shiffrin RM, 2004, P NATL ACAD SCI USA, V101, P5183, DOI 10.1073/pnas.0307852100 Smalheiser N. R., 2009, ANNU REV INFORM SCI, V43, P1, DOI DOI 10.1002/ARIS.2009.1440430113 Tang L, 2010, SCIENTOMETRICS, V84, P763, DOI 10.1007/s11192-010-0196-6 Van Raan AFJ, 2006, SCIENTOMETRICS, V67, P491, DOI 10.1556/Scient.67.2006.3.10 van Raan AFJ, 2010, J INFORMETR, V4, P431, DOI 10.1016/j.joi.2010.03.008 Waltman L, 2011, SCIENTOMETRICS, V87, P467, DOI 10.1007/s11192-011-0354-5 Waltman L, 2011, J INFORMETR, V5, P37, DOI 10.1016/j.joi.2010.08.001 NR 33 TC 2 Z9 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 1751-1577 EI 1875-5879 J9 J INFORMETR JI J. Informetr. PD JAN PY 2013 VL 7 IS 1 BP 63 EP 71 DI 10.1016/j.joi.2012.08.007 PG 9 WC Information Science & Library Science SC Information Science & Library Science GA 065BG UT WOS:000313121300006 ER PT J AU Franceschini, F Galetto, M Maisano, D Mastrogiacomo, L AF Franceschini, Fiorenzo Galetto, Maurizio Maisano, Domenico Mastrogiacomo, Luca TI Further clarifications about the success-index SO JOURNAL OF INFORMETRICS LA English DT Article DE Success-index; Citation propensity; Field normalization; h-Index AB The aim of this brief communication is to reply to a letter by Kosmulski (Journal of Informetrics 6(3):368-369, 2012), which criticizes a recent indicator called "success-index". The most interesting features of this indicator, presented in Franceschini et al. (Scientometrics, in press), are: (i) allowing the selection of an "elite" subset from a set of publications and (ii) implementing the field-normalization at the level of an individual publication. We show that the Kosmulski's criticism is unfair and inappropriate, as it is the result of a misinterpretation of the indicator. (C) 2012 Elsevier Ltd. All rights reserved. C1 [Franceschini, Fiorenzo; Galetto, Maurizio; Maisano, Domenico; Mastrogiacomo, Luca] Politecn Torino, DIGEP Dept Management & Prod Engn, I-10129 Turin, Italy. RP Franceschini, F (reprint author), Politecn Torino, DIGEP Dept Management & Prod Engn, Corso Duca Abruzzi 24, I-10129 Turin, Italy. EM fiorenzo.franceschini@polito.it RI MAISANO, Domenico/B-4301-2010 OI MAISANO, Domenico/0000-0002-8154-4469 CR Franceschini F., SCIENTOMETRICS Franceschini F., SCIENTOMETRICS UNPUB Franceschini F., J INFORMETRICS UNPUB GARFIELD E, 1979, SCIENTOMETRICS, V1, P359, DOI 10.1007/BF02019306 Glanzel W, 2011, J INF SCI, V37, P40, DOI 10.1177/0165551510392316 Hirsch JE, 2007, P NATL ACAD SCI USA, V104, P19193, DOI 10.1073/pnas.0707962104 Hirsch JE, 2005, P NATL ACAD SCI USA, V102, P16569, DOI 10.1073/pnas.0507655102 ISI Web of Knowledge, 2012, ESS SCI IND Kosmulski M, 2012, J INFORMETR, V6, P368, DOI 10.1016/j.joi.2012.02.004 Kosmulski M, 2011, J INFORMETR, V5, P481, DOI 10.1016/j.joi.2011.03.001 Moed HF, 2010, J INFORMETR, V4, P265, DOI 10.1016/j.joi.2010.01.002 Vinkler P, 2011, J AM SOC INF SCI TEC, V62, P1963, DOI 10.1002/asi.21600 Waltman L, 2012, J AM SOC INF SCI TEC, V63, P406, DOI 10.1002/asi.21678 NR 13 TC 2 Z9 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 1751-1577 J9 J INFORMETR JI J. Informetr. PD OCT PY 2012 VL 6 IS 4 BP 669 EP 673 DI 10.1016/j.joi.2012.07.005 PG 5 WC Information Science & Library Science SC Information Science & Library Science GA 003AY UT WOS:000308581700026 ER PT J AU Kortelainen, T Katvala, M AF Kortelainen, Terttu Katvala, Mari TI "Everything is plentiful-Except attention". Attention data of scientific journals on social web tools SO JOURNAL OF INFORMETRICS LA English DT Article DE Attention; Scientific publishing; Social media; Facebook; Twitter ID INFORMATION; BLOGS; ECONOMY AB One hundred scientific and scholarly journal web sites were investigated to find out their use of social media tools and to examine attention data revealed by them. Seventy-eight scientific journals used social media tools, RSS being the most common. Interactive social media tools - Facebook, Twitter and blogs - were present on 19 journal web sites. Attention data were operationalised as liking, commenting or sharing postings on Facebook, Twitter or blog texts or linking to articles, liking a YouTube entry or following a journal on Twitter. Facebook and blog sites of the journals had varying roles with respect to content generated by readers and the journal, and the amount of attention data received by the journals' Facebook, Twitter and blog sites also showed great variation. In scientific communication, social media have a role of their own, complementing that of scientific journals, and their active use indicates the clear demand for them. Attention is difficult to measure also by social media, but their interactive features obviously indicate one part of it, and attention economy presents a fruitful viewpoint for studying scientific communication by providing relevant and useful concepts that describe its characteristics and factors that influence the attention it receives. (C) 2012 Elsevier Ltd. All rights reserved. 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Informetr. PD OCT PY 2012 VL 6 IS 4 BP 661 EP 668 DI 10.1016/j.joi.2012.06.004 PG 8 WC Information Science & Library Science SC Information Science & Library Science GA 003AY UT WOS:000308581700025 ER PT J AU Kosmulski, M AF Kosmulski, Marek TI The order in the lists of authors in multi-author papers revisited SO JOURNAL OF INFORMETRICS LA English DT Article DE Citation analysis; Multi-author papers; Alphabetical order ID MULTIPLE AUTHORSHIP; NAME; SCIENTISTS; PATTERNS; CREDIT; INDEX AB The leaders of scientific groups appear in the last place (or in the first place) of the authors' lists of multi-author papers more often than other scientists (group-members). The preferential position of the group leader depends on the branch of science, geographical location and the time point. New tools to study the order of authors were introduced. The validity of assessment of the contributions of particular authors to the paper solely from their ranks in the authors' lists was challenged. (C) 2012 Elsevier Ltd. All rights reserved. C1 Lublin Univ Technol, Lublin, Poland. RP Kosmulski, M (reprint author), Lublin Univ Technol, Lublin, Poland. EM mkosmuls@abo.fi RI Kosmulski, Marek/B-9158-2009; Kosmulski, Marek/F-2326-2010 CR Cole J. 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Informetr. PD OCT PY 2012 VL 6 IS 4 BP 639 EP 644 DI 10.1016/j.joi.2012.06.006 PG 6 WC Information Science & Library Science SC Information Science & Library Science GA 003AY UT WOS:000308581700022 ER PT J AU Liu, JS Lu, LYY Ho, MHC AF Liu, John S. Lu, Louis Y. Y. Ho, Mei Hsiu-Ching TI Total influence and mainstream measures for scientific researchers SO JOURNAL OF INFORMETRICS LA English DT Article DE Scientific influence; Research performance; Citation network; Bibliometric indicators; Hirsch index ID HIRSCH INDEX; RESEARCH COLLABORATION; PRODUCTIVITY; IMPACT; EFFICIENCY; NETWORKS AB We propose two new indices that are able to measure a scientific researcher's overall influence and the level of his/her works' association with the main-stream research subjects within a scientific field. These two new measures - the total influence index and the mainstream index - differ from traditional performance measures such as the simple citation count and the h-index in that they take into account the indirect influence of an author's work. Indirect influence describes a scientific publication's impact upon subsequent works that do not reference it directly. The two measures capture indirect influence information from the knowledge emanating paths embedded in the citation network of a target scientific field. We take the Hirsch index, data envelopment analysis, and lithium iron phosphate battery technology field to examine the characteristics of these two measures. The results show that the total influence index favors earlier researchers and successfully highlights those researchers who have made crucial contributions to the target scientific field. The main-stream index, in addition to underlining total influence, also spotlights active researchers who enter into a scientific field in a later development stage. In summary, these two new measures are valuable complements to traditional scientific performance measures. (C) 2012 Elsevier Ltd. All rights reserved. C1 [Liu, John S.; Ho, Mei Hsiu-Ching] Natl Taiwan Univ Sci & Technol, Grad Inst Technol Management, Taipei 10607, Taiwan. [Lu, Louis Y. Y.] Yuan Ze Univ, Coll Management, Chungli 32003, Taiwan. RP Liu, JS (reprint author), Natl Taiwan Univ Sci & Technol, Grad Inst Technol Management, 43,Sect 4,Keelung Rd, Taipei 10607, Taiwan. EM johnliu@mail.ntust.edu.tw; louislu@saturn.yzu.edu.tw; mei.ho@mail.ntust.edu.tw CR Abbasi A, 2011, J INFORMETR, V5, P594, DOI 10.1016/j.joi.2011.05.007 Abramo G, 2009, HIGH EDUC, V57, P155, DOI 10.1007/s10734-008-9139-z Alonso S, 2009, J INFORMETR, V3, P273, DOI 10.1016/j.joi.2009.04.001 Batagelj V., 2003, U LJUBLJANA PREPRINT, V41, P897 BESSENT AM, 1980, EDUC ADMIN QUART, V16, P57, DOI 10.1177/0013161X8001600207 CHARNES A, 1978, EUR J OPER RES, V2, P429, DOI 10.1016/0377-2217(78)90138-8 Egghe L, 2010, ANNU REV INFORM SCI, V44, P65 Egghe L, 2006, SCIENTOMETRICS, V69, P131, DOI 10.1007/s11192-006-0144-7 GARFIELD E, 1963, AM DOC, V14, P289, DOI 10.1002/asi.5090140405 Hirsch JE, 2007, P NATL ACAD SCI USA, V104, P19193, DOI 10.1073/pnas.0707962104 Hirsch JE, 2010, SCIENTOMETRICS, V85, P741, DOI 10.1007/s11192-010-0193-9 Hirsch JE, 2005, P NATL ACAD SCI USA, V102, P16569, DOI 10.1073/pnas.0507655102 HUMMON NP, 1989, SOC NETWORKS, V11, P39, DOI 10.1016/0378-8733(89)90017-8 Landry R, 1996, HIGH EDUC, V32, P283, DOI 10.1007/BF00138868 Lee S, 2005, SOC STUD SCI, V35, P673, DOI 10.1177/0306312705052359 Liu J.S., 2012, OMEGA INT J MANAGEME Liu JS, 2012, J AM SOC INF SCI TEC, V63, P528, DOI 10.1002/asi.21692 Padhi AK, 1997, J ELECTROCHEM SOC, V144, P1188, DOI 10.1149/1.1837571 Pike TW, 2010, BEHAV ECOL, V21, P431, DOI 10.1093/beheco/arp194 Schreiber M, 2010, ANN PHYS-BERLIN, V522, P536, DOI 10.1002/andp.201000046 Ynalvez MA, 2011, RES POLICY, V40, P204, DOI 10.1016/j.respol.2010.10.004 NR 21 TC 2 Z9 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 1751-1577 J9 J INFORMETR JI J. Informetr. PD OCT PY 2012 VL 6 IS 4 BP 496 EP 504 DI 10.1016/j.joi.2012.04.005 PG 9 WC Information Science & Library Science SC Information Science & Library Science GA 003AY UT WOS:000308581700006 ER PT J AU Radicchi, F Castellano, C AF Radicchi, Filippo Castellano, Claudio TI Why Sirtes's claims (Sirtes, 2012) do not square with reality SO JOURNAL OF INFORMETRICS LA English DT Letter ID CITATION INDICATORS; IMPACT FACTOR; JOURNALS; FAIRNESS C1 [Radicchi, Filippo] Univ Rovira & Virgili, Dept Engn Quim, Tarragona 43007, Catalunya, Spain. [Castellano, Claudio] Ist Sistemi Complessi ISC CNR, I-00185 Rome, Italy. [Castellano, Claudio] Univ Roma La Sapienza, Dipartimento Fis, I-00185 Rome, Italy. RP Radicchi, F (reprint author), Univ Rovira & Virgili, Dept Engn Quim, Av Paisos Catalans 26, Tarragona 43007, Catalunya, Spain. EM f.radicchi@gmail.com RI Castellano, Claudio/B-6946-2008; Radicchi, Filippo/B-4407-2009 OI Castellano, Claudio/0000-0002-3773-3801; CR Garfield E, 2006, JAMA-J AM MED ASSOC, V295, P90, DOI 10.1001/jama.295.1.90 Leydesdorff L, 2010, J INFORMETR, V4, P644, DOI 10.1016/j.joi.2010.05.003 Pudovkin AI, 2002, J AM SOC INF SCI TEC, V53, P1113, DOI 10.1002/asi.10153 Radicchi F, 2012, J INFORMETR, V6, P121, DOI 10.1016/j.joi.2011.09.002 Radicchi F, 2008, P NATL ACAD SCI USA, V105, P17268, DOI 10.1073/pnas.0806977105 Seglen PO, 1997, BRIT MED J, V314, P498 Sirtes D, 2012, J INFORMETR, V6, P448, DOI 10.1016/j.joi.2012.01.008 NR 7 TC 2 Z9 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 1751-1577 J9 J INFORMETR JI J. Informetr. PD OCT PY 2012 VL 6 IS 4 BP 615 EP 618 DI 10.1016/j.joi.2012.06.001 PG 4 WC Information Science & Library Science SC Information Science & Library Science GA 003AY UT WOS:000308581700019 ER PT J AU van den Besselaar, P AF van den Besselaar, Peter TI Selection committee membership: Service or self-service SO JOURNAL OF INFORMETRICS LA English DT Article DE Project funding; Peer review; Grant decision-making; Information advantage; Bias; Nepotism; Research performance ID DECISION-MAKING; NEPOTISM; BIAS AB Project funding is an increasingly important mode of research funding. The rationale is that through project funding new fields and new themes can be supported more effectively. Furthermore, project funding improves competition, which is expected to select the better research projects and researchers. However, project funding has a price, as it requires researchers to invest time in reviewing proposals, and to participate in selection committees. In that perspective, selection committee membership can be seen as a service to the scholarly community. However, what do committee members themselves get from membership? In this paper we show that committee members in average are more successful in grant applications than other principle investigators, and this is not explained by performance differences. The findings suggest that committee membership is not only service, but also self-service. (C) 2012 Elsevier Ltd. All rights reserved. C1 [van den Besselaar, Peter] Vrije Univ Amsterdam, Dept Org Sci, Amsterdam, Netherlands. [van den Besselaar, Peter] Vrije Univ Amsterdam, Network Inst, Amsterdam, Netherlands. RP van den Besselaar, P (reprint author), Vrije Univ Amsterdam, Dept Org Sci, Amsterdam, Netherlands. EM p.a.a.vanden.besselaar@vu.nl RI van den Besselaar, Peter/E-5938-2013 OI van den Besselaar, Peter/0000-0002-8304-8565 CR Bornmann L, 2007, J INFORMETR, V1, P226, DOI 10.1016/j.joi.2007.03.001 Bornmann L, 2010, J INFORMETR, V4, P211, DOI 10.1016/j.joi.2009.10.004 CBS, 2011, ICT KNOWL EC 2011 Ceci SJ, 2011, P NATL ACAD SCI USA, V108, P3157, DOI 10.1073/pnas.1014871108 Chubin D. E., 1990, PEERLESS SCI PEER RE ESF, 2006, PEER REV ITS PRES FU Hansson F., 2012, HIGHER ED POLICY, V25 Langfeldt L, 2004, RES EVALUAT, V13, P51, DOI 10.3152/147154404781776536 Langfeldt L, 2001, SOC STUD SCI, V31, P820, DOI 10.1177/030631201031006002 Lepori B., 2007, SCI PUBL POLICY, V34, P372, DOI 10.3152/030234207X234578 Marsh H. 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PD OCT PY 2012 VL 6 IS 4 BP 580 EP 585 DI 10.1016/j.joi.2012.05.003 PG 6 WC Information Science & Library Science SC Information Science & Library Science GA 003AY UT WOS:000308581700015 ER PT J AU Zhou, P Zhong, YF AF Zhou, Ping Zhong, Yongfeng TI The citation-based indicator and combined impact indicator-New options for measuring impact SO JOURNAL OF INFORMETRICS LA English DT Article DE Citation based indicator (CBI); Combined impact indicator (CII); Integrated impact indicator (I3); Percentile ranks (PRs) AB Metrics based on percentile ranks (PRs) for measuring scholarly impact involves complex treatment because of various defects such as overvaluing or devaluing an object caused by percentile ranking schemes, ignoring precise citation variation among those ranked next to each other, and inconsistency caused by additional papers or citations. These defects are especially obvious in a small-sized dataset. To avoid the complicated treatment of PRs based metrics, we propose two new indicators-the citation-based indicator (CBI) and the combined impact indicator (CII). Document types of publications are taken into account. With the two indicators, one would no more be bothered by complex issues encountered by PRs based indicators. For a small-sized dataset with less than 100 papers, special calculation is no more needed. The CBI is based solely on citation counts and the CII measures the integrate contributions of publications and citations. Both virtual and empirical data are used so as to compare the effect of related indicators. The CII and the PRs based indicator I3 are highly correlated but the former reflects citation impact more and the latter relates more to publications. (C) 2012 Elsevier Ltd. All rights reserved. C1 [Zhou, Ping; Zhong, Yongfeng] Inst Sci & Tech Informat China, Beijing 100038, Peoples R China. RP Zhou, P (reprint author), Inst Sci & Tech Informat China, 15 Fuxing Rd, Beijing 100038, Peoples R China. 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Informetr. PD OCT PY 2012 VL 6 IS 4 BP 631 EP 638 DI 10.1016/j.joi.2012.05.004 PG 8 WC Information Science & Library Science SC Information Science & Library Science GA 003AY UT WOS:000308581700021 ER PT J AU Magnone, E AF Magnone, Edoardo TI An analysis for estimating the short-term effects of Japan's triple disaster on progress in materials science SO JOURNAL OF INFORMETRICS LA English DT Article DE Publication regularity; Publication distribution; Progress in materials science; Natural disaster; Tsunami; Japan; Public fund allocation ID NATIONS AB Suppose there is a scientist that writes a paper for a peer-reviewed journal. How likely is it that a natural disaster will terminate, change, suspend or discontinue some aspect of this editorial process? To answer this question, the aim of present study was to determine the effects of a natural disaster on progress in materials science research. The Tsunami event in Japan and materials science are well suited to serve as a case study for both the development and application of a system to evaluate the Academic Research Output immediately after a natural disaster. In particular, the analysis focused on the short-term impacts of Japan's triple disaster - earthquake, Tsunami, and nuclear accident (11 March, 2011) - on the Academic Research Output in materials science subject from three different areas: Sendai (Miyagi Prefecture), Tsukuba (Ibaraki Prefecture) and Kyoto (Kyoto Prefecture). The last one has been used as an internal reference standard (normal/non-disaster situation) for the comparison. A geographical cluster-based study was conducted between 09 February and 10 April 2011. Consistent with the hypothesis that a disaster might slow down knowledge production, the conclusion showed that the Japan's triple disaster strongly influenced the Academic Research Output of papers in the selected field of science. Using statistical data, these findings show that the number of submitted papers and the cumulative number of authors contributing to the field of materials science decreased immediately after the March 11th events in the areas affected by disaster. (C) 2012 Elsevier Ltd. All rights reserved. C1 Korea Inst Energy Res, High Efficiency & Clean Energy Res Div, Taejon 305343, South Korea. RP Magnone, E (reprint author), Korea Inst Energy Res, High Efficiency & Clean Energy Res Div, 152 Gajeong Ro, Taejon 305343, South Korea. 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TI A formal relation between the h-index of a set of articles and their I3 score SO JOURNAL OF INFORMETRICS LA English DT Article AB The h-index can be written in such a way that it formally resembles an I3 score. Yet, this formal correspondence should not hide the fact that these indicators are fundamentally different. (C) 2011 Elsevier Ltd. All rights reserved. C1 [Rousseau, Ronald] KHBO Assoc KU Leuven, B-8400 Oostende, Belgium. [Rousseau, Ronald] Katholieke Univ Leuven, Dept Math, B-3000 Louvain, Heverlee, Belgium. [Ye, Fred Y.] Zhejiang Univ, Dept Informat Resource Management, Hangzhou 310003, Zhejiang, Peoples R China. RP Rousseau, R (reprint author), KHBO Assoc KU Leuven, Zeedijk 101, B-8400 Oostende, Belgium. EM ronald.rousseau@khbo.be; yye@zju.edu.cn CR Hirsch JE, 2005, P NATL ACAD SCI USA, V102, P16569, DOI 10.1073/pnas.0507655102 Jin BH, 2007, CHINESE SCI BULL, V52, P855, DOI 10.1007/s11434-007-0145-9 Leydesdorff L., 2011, J AM SOC INFORM SCI, V62 Rousseau R, 2011, PERCENTILE RANK SCOR Waltman L., 2009, ISSI NEWSLETTER, V5, P46 NR 5 TC 2 Z9 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 1751-1577 J9 J INFORMETR JI J. Informetr. PD JAN PY 2012 VL 6 IS 1 BP 34 EP 35 DI 10.1016/j.joi.2011.09.004 PG 2 WC Information Science & Library Science SC Information Science & Library Science GA 865QL UT WOS:000298325300005 ER PT J AU Su, C Pan, YT Zhen, YN Ma, Z Yuan, JP Guo, H Yu, ZL Ma, CF Wu, YS AF Su Cheng Pan YunTao Zhen YanNing Ma Zheng Yuan JunPeng Guo Hong Yu ZhengLu Ma CaiFeng Wu YiShan TI PrestigeRank: A new evaluation method for papers and journals SO JOURNAL OF INFORMETRICS LA English DT Article DE PrestigeRank; Citation analysis; Paper evaluation; Journal evaluation; PageRank; Authority factor; Impact factor ID PAGERANK ALGORITHM; ANATOMY AB This paper studies how missing data in the PageRank algorithm influences the result of papers ranking and proposes PrestigeRank algorithm on that basis. We make use of PrestigeRank to give the ranking of all papers in physics in the Chinese Scientific and Technology Papers and Citation Database (CSTPCD) published between 2004 and 2006. We compared PrestigeRank result with PageRank and citation ranking. We found PrestigeRank is significantly correlated with PageRank and citation counts. We also used paper citation networks to rank journals, and compared the result with that of journal citation networks. We proposed PR(sum), PR(ave), and compared both of them with citation counts and impact factor. It indicates PR(sum), PR(ave) can reflect journal's authority favorably. We also discuss the advantages and disadvantages, application scope and application prospects of PrestigeRank in the evaluation of papers and journals. (C) 2010 Elsevier Ltd. All rights reserved. C1 [Su Cheng; Pan YunTao; Zhen YanNing; Ma Zheng; Yuan JunPeng; Guo Hong; Yu ZhengLu; Ma CaiFeng; Wu YiShan] Inst Sci & Tech Informat China, Res Ctr Informat Sci Methodol, Beijing 100038, Peoples R China. RP Su, C (reprint author), Inst Sci & Tech Informat China, Res Ctr Informat Sci Methodol, 15 Fuxing Rd, Beijing 100038, Peoples R China. EM sucheng@istic.ac.cn CR Bollen J, 2006, SCIENTOMETRICS, V69, P669, DOI 10.1007/s11192-006-0176-z Brin S, 1998, COMPUT NETWORKS ISDN, V30, P107, DOI 10.1016/S0169-7552(98)00110-X Buela-Casal G., 2004, PSYCHOL SPAIN, V8, P60 Chen P, 2007, J INFORMETR, V1, P8, DOI 10.1016/j.joi.2006.06.001 GARFIELD E, 1955, SCIENCE, V122, P108, DOI 10.1126/science.122.3159.108 Garfield E., 1972, ESSAYS INFORMATION S, V1, P527 Kleinberg JM, 1998, P 9 ANN ACM SIAM S D, P668 Langville A. M., 2006, GOOGLES PAGERANK SCI Li C. 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PD JAN PY 2011 VL 5 IS 1 BP 1 EP 13 DI 10.1016/j.joi.2010.03.011 PG 13 WC Information Science & Library Science SC Information Science & Library Science GA 698WS UT WOS:000285626000001 ER PT J AU Elleby, A Ingwersen, P AF Elleby, Anita Ingwersen, Peter TI Publication point indicators: A comparative case study of two publication point systems and citation impact in an interdisciplinary context SO JOURNAL OF INFORMETRICS LA English DT Article DE Journal Crown Indicator; Publication point indicators; Norwegian system; Web of Science; Google Scholar; Publication Point Ratio; Normalized Cumulated Publication Point; Index AB The paper presents comparative analyses of two publication point systems, The Norwegian and the in-house system from the interdisciplinary Danish Institute of International Studies (DIIS), used as case in the study for publications published 2006, and compares central citation-based indicators with novel publication point indicators (PPIs) that are formalized and exemplified. Two diachronic citation windows are applied: 2006-07 and 2006-08. Web of Science (WoS) as well as Google Scholar (GS) are applied to observe the cite delay and citedness for the different document types published by DIIS, journal articles, book chapters/conference papers and monographs. Journal Crown Indicator (JCI) calculations was based on WoS. Three PPIs are proposed: the Publication Point Ratio (PPR), which measures the sum of obtained publication points over the sum of the ideal points for the same set of documents; the Cumulated Publication Point Indicator (CPPI), which graphically illustrates the cumulated gain of obtained vs. ideal points, both seen as vectors; and the normalized Cumulated Publication Point Index (nCPPI) that represents the cumulated gain of publication success as index values, either graphically or as one overall score for the institution under evaluation. The case study indicates that for smaller interdisciplinary research institutions the cite delay is substantial (2-3 years to obtain a citedness of 50%) when applying WoS for articles. Applying GS implies a shorter delay and much higher citedness for all document types. Statistical significant correlations were only found between WoS and GS and the two publication point systems in between, respectively. The study demonstrates how the nCPPI can be applied to institutions as evaluation tools supplementary to JCI in various combinations, in particular when institutions include humanistic and social science disciplines. (C) 2010 Elsevier Ltd. All rights reserved. C1 [Ingwersen, Peter] Royal Sch Lib & Informat Sci, DK-2300 Copenhagen S, Denmark. [Elleby, Anita] Natl Museum, Dept Conservat, DK-2800 Kongens Lyngby, Denmark. RP Ingwersen, P (reprint author), Royal Sch Lib & Informat Sci, Birketinget 6, DK-2300 Copenhagen S, Denmark. EM anita.elleby@gmail.com; pi@db.dk CR AHLGREN P, J AM SOC IN IN PRESS BRAUN T, 1990, SCIENTOMETRICS, V19, P513, DOI 10.1007/BF02020712 Butler L., 2008, Ethics in Science and Environmental Politics, V8 Butler L, 2003, RES POLICY, V32, P143, DOI 10.1016/S0048-7333(02)00007-0 DROTNER K, 2007, MAGASINET HUMANIORA, V22, P4 HARNAD S, 2008, ETHICS SCI ENVIRONME, V8 HJORTGAARD C, 1997, SCIENTOMETRICS, V40, P529 Ingwersen P., 2005, TURN INTEGRATION INF Ingwersen P, 2007, Proceedings of ISSI 2007: 11th International Conference of the International Society for Scientometrics and Informetrics, Vols I and II, P864 Jacso P, 2008, ONLINE INFORM REV, V32, P102, DOI 10.1108/14684520810866010 Jarvelin K, 2002, ACM T INFORM SYST, V20, P422, DOI 10.1145/582415.582418 Jarvelin K, 2008, J AM SOC INF SCI TEC, V59, P1433, DOI 10.1002/asi.20847 Martin BR, 1996, SCIENTOMETRICS, V36, P343, DOI 10.1007/BF02129599 Moed H.F., 2005, CITATION ANAL RES EV Sandstrom U, 2009, RES EVALUAT, V18, P243, DOI 10.3152/095820209X466892 SCHNEIDER JW, 2009, NORWAY EUROPEAN POLI, V8, P364 SEGLEN PO, 1994, J AM SOC INFORM SCI, V45, P1, DOI 10.1002/(SICI)1097-4571(199401)45:1<1::AID-ASI1>3.0.CO;2-Y SIVERTSEN G, 2007, 12 NORD WORKSH BIBL SIVERTSEN G, 2007, MAGASINET HUMANIORA, V22, P22 Van Raan A, 1999, SCIENTOMETRICS, V45, P417 NR 20 TC 2 Z9 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 1751-1577 J9 J INFORMETR JI J. Informetr. PD OCT PY 2010 VL 4 IS 4 BP 512 EP 523 DI 10.1016/j.joi.2010.06.001 PG 12 WC Information Science & Library Science SC Information Science & Library Science GA 647KA UT WOS:000281616200007 ER PT J AU Lu, K Wolfram, D AF Lu, Kun Wolfram, Dietmar TI Geographic characteristics of the growth of informetrics literature 1987-2008 SO JOURNAL OF INFORMETRICS LA English DT Article DE Literature growth; Research collaboration; Informetrics research ID SCIENCE; SYSTEM; WORLD AB Recent studies have concluded that American contributions to science literature have been in relative decline, whereas contributions from other parts of the world such as the European Union and Asia have increased. Is the same true for the areas of bibliometrics, informetrics and scientometrics? This study investigates the growth and geographic distribution of metrics research for the period 1987-2008. Similar to studies of other disciplines or science in general, the findings reveal that the United States continues to dominate, but there has been a recent relative decline in North American contributions overall. European and Asian contributions have grown substantially. National and institutional collaborations that contribute to this growth do not necessarily follow close geographic proximity, although European nations have been more active with international collaborations overall, both within Europe and elsewhere. (C) 2010 Elsevier Ltd. All rights reserved. C1 [Lu, Kun; Wolfram, Dietmar] Univ Wisconsin, Sch Informat Studies, Milwaukee, WI 53201 USA. RP Wolfram, D (reprint author), Univ Wisconsin, Sch Informat Studies, POB 413, Milwaukee, WI 53201 USA. EM kunlu@uwm.edu; dwolfram@uwm.edu RI Wolfram, Dietmar/A-2449-2008 CR Archambault E., 2010, 30 YEARS SCI SECULAR Glanzel W, 2008, SCIENTOMETRICS, V74, P71, DOI 10.1007/s11192-008-0104-5 GLANZEL W, 2001, SCIENTOMETRICS, V115, P51 Hood WW, 2001, SCIENTOMETRICS, V52, P291, DOI 10.1023/A:1017919924342 Jin BH, 2004, HANDBOOK OF QUANTITATIVE SCIENCE AND TECHNOLOGY RESEARCH: THE USE OF PUBLICATION AND PATENT STATISTICS IN STUDIES OF S&T SYSTEMS, P497 King DA, 2004, NATURE, V430, P311, DOI 10.1038/430311a Leydesdorff L, 2000, SCIENTOMETRICS, V47, P265, DOI 10.1023/A:1005639026643 Leydesdorff L, 2006, J AM SOC INF SCI TEC, V57, P1616, DOI 10.1002/asi.20335 Leydesdorff L, 2009, J INFORMETR, V3, P353, DOI 10.1016/j.joi.2009.05.005 LEYDESDORFF L, 2010, MAPPING GEOGRAPHY SC Leydesdorff L, 2009, SCIENTOMETRICS, V78, P23, DOI 10.1007/s11192-008-1830-4 Shelton RD, 2007, Proceedings of ISSI 2007: 11th International Conference of the International Society for Scientometrics and Informetrics, Vols I and II, P708 SHELTON RD, RACE WORLD LEADERSHI Shelton RD, 2004, SCIENTOMETRICS, V60, P353, DOI 10.1023/B:SCIE.0000034379.75236.d9 Shelton RD, 2008, SCIENTOMETRICS, V74, P191, DOI 10.1007/s11192-008-0212-2 Stock W. G., 2006, INFORM WISSENSCHAFT, V57, P385 Thelwall M., 2009, INTRO WEBOMETRICS QU van Eck NJ, 2009, J AM SOC INF SCI TEC, V60, P1635, DOI 10.1002/asi.21075 van Eck NJ, 2010, SCIENTOMETRICS, V84, P523, DOI 10.1007/s11192-009-0146-3 WOLFRAM D, 2008, ISSI NEWSLETTER, V4, P21 Zhou P, 2006, RES POLICY, V35, P83, DOI 10.1016/j.respol.2005.08.006 NR 21 TC 2 Z9 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 1751-1577 J9 J INFORMETR JI J. Informetr. PD OCT PY 2010 VL 4 IS 4 BP 591 EP 601 DI 10.1016/j.joi.2010.06.008 PG 11 WC Information Science & Library Science SC Information Science & Library Science GA 647KA UT WOS:000281616200013 ER PT J AU Schreiber, M AF Schreiber, Michael TI A case study of the modified g index: Counting multi-author publications fractionally SO JOURNAL OF INFORMETRICS LA English DT Article DE Hirsch index; h index; g index; Citation analysis ID MULTI-AUTHORED MANUSCRIPTS; H-INDEX; HIRSCH INDEX; R-INDEX; PHYSICISTS AB The citation records of 26 physicists are analyzed in order to determine the modified g index gm which takes multiple coauthorship into account by fractionalized counting of the publications. The results are compared with the original g index as well as with the h index and the respective modified h index h(m). Although the correlations between these indices are relatively strong, the arrangement of the datasets is significantly different in detail depending on whether they are put into order according to the values of either the original or the modified indices. (C) 2010 Elsevier Ltd. All rights reserved. C1 Tech Univ Chemnitz, Inst Phys, D-09107 Chemnitz, Germany. RP Schreiber, M (reprint author), Tech Univ Chemnitz, Inst Phys, Reichenhainer Str 70, D-09107 Chemnitz, Germany. EM schreiber@physik.tu-chemnitz.de CR BURRELL QL, 2007, MULTIDIMENSIONAL WOR, P65 Chai J. C., 2008, P WIS 2008 BERL Egghe L, 2000, J AM SOC INFORM SCI, V51, P145, DOI 10.1002/(SICI)1097-4571(2000)51:2<145::AID-ASI6>3.0.CO;2-9 Egghe L, 2006, SCIENTOMETRICS, V69, P131, DOI 10.1007/s11192-006-0144-7 Egghe L, 2008, J AM SOC INF SCI TEC, V59, P1608, DOI 10.1002/asi.20845 EGGHE L, 1990, INTRO INFORM QUANTIT, P223 HARSANYI MA, 1993, LIBR INFORM SCI RES, V15, P325 Hirsch JE, 2010, SCIENTOMETRICS, V85, P741, DOI 10.1007/s11192-010-0193-9 Hirsch JE, 2005, P NATL ACAD SCI USA, V102, P16569, DOI 10.1073/pnas.0507655102 Jin BH, 2007, CHINESE SCI BULL, V52, P855, DOI 10.1007/s11434-007-0145-9 LINDSEY D, 1980, SOC STUD SCI, V10, P145, DOI 10.1177/030631278001000202 PRICE DD, 1981, SCIENCE, V212, P986 Rousseau R., 2006, SIMPLE MODELS CORRES Schreiber M, 2008, J INFORMETR, V2, P211, DOI 10.1016/j.joi.2008.05.001 Schreiber M, 2010, J AM SOC INF SCI TEC, V61, P169, DOI 10.1002/asi.21218 Schreiber M, 2010, J INFORMETR, V4, P42, DOI 10.1016/j.joi.2009.06.003 Schreiber M, 2009, J AM SOC INF SCI TEC, V60, P2145, DOI 10.1002/asi.21119 Schreiber M, 2008, NEW J PHYS, V10, DOI 10.1088/1367-2630/10/4/040201 Schreiber M, 2008, J AM SOC INF SCI TEC, V59, P1513, DOI 10.1002/asi.20856 Schreiber M, 2009, ANN PHYS-BERLIN, V18, P607, DOI 10.1002/andp.200910360 Schreiber M, 2009, J AM SOC INF SCI TEC, V60, P1274, DOI 10.1002/asi.21057 Schreiber M, 2007, ANN PHYS-BERLIN, V16, P640, DOI 10.1002/andp.200710252 Wan J., 2007, COLLNET J SCIENTOMET, V1, P1 NR 23 TC 2 Z9 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 1751-1577 J9 J INFORMETR JI J. Informetr. PD OCT PY 2010 VL 4 IS 4 BP 636 EP 643 DI 10.1016/j.joi.2010.07.003 PG 8 WC Information Science & Library Science SC Information Science & Library Science GA 647KA UT WOS:000281616200018 ER PT J AU Kosmulski, M AF Kosmulski, Marek TI Hirsch-type approach to the 2nd generation citations SO JOURNAL OF INFORMETRICS LA English DT Article DE Citation metrics; Hirsch-type indices; Research output ID SCIENTIFIC-RESEARCH OUTPUT; PUBLICATIONS; INDEXES AB Scientific papers are usually assessed by a number of direct citations. The number of citations received by direct citations (2nd generation citations) has been considered as an alternative criterion of evaluation. Such an approach overrates the papers, which received citation(s) in one or in a few very highly cited papers. Hirsch-type approach to the 2nd generation citations suggested by Schubert was used to combine the impact and quantity of 1st generation citations into one number. (C) 2010 Elsevier Ltd. All rights reserved. C1 Tech Univ Lublin, Dept Electrochem, PL-20618 Lublin, Poland. RP Kosmulski, M (reprint author), Tech Univ Lublin, Dept Electrochem, Nadbystrzycka 38, PL-20618 Lublin, Poland. EM mkosmuls@hektor.umcs.lublin.pl RI Kosmulski, Marek/F-2326-2010; Kosmulski, Marek/B-9158-2009 CR Albert R, 2002, REV MOD PHYS, V74, P47, DOI 10.1103/RevModPhys.74.47 DIEKS D, 1976, SOC STUD SCI, V6, P247, DOI 10.1177/030631277600600204 Hirsch JE, 2005, P NATL ACAD SCI USA, V102, P16569, DOI 10.1073/pnas.0507655102 Kosmulski M., 2006, FORUM AKAD, P31 Panaretos J, 2009, SCIENTOMETRICS, V81, P635, DOI 10.1007/s11192-008-2174-9 PINSKI G, 1976, INFORM PROCESS MANAG, V12, P297, DOI 10.1016/0306-4573(76)90048-0 Prathap G, 2006, CURR SCI INDIA, V91, P1439 Redner S, 2005, PHYS TODAY, V58, P49, DOI 10.1063/1.1996475 Rousseau Paul, 2005, J Palliat Med, V8, P10, DOI 10.1089/jpm.2005.8.10 Schubert A, 2009, SCIENTOMETRICS, V78, P559, DOI 10.1007/s11192-008-2208-3 Soler JM, 2007, J INFORMETR, V1, P123, DOI 10.1016/j.joi.2006.10.004 NR 11 TC 2 Z9 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 1751-1577 J9 J INFORMETR JI J. Informetr. PD JUL PY 2010 VL 4 IS 3 BP 257 EP 264 DI 10.1016/j.joi.2010.01.003 PG 8 WC Information Science & Library Science SC Information Science & Library Science GA 607YQ UT WOS:000278543600006 ER PT J AU Keyhanipour, AH Piroozmand, M Badie, K AF Keyhanipour, Amir Hosein Piroozmand, Maryam Badie, Kambiz TI A GP-adaptive web ranking discovery framework based on combinative content and context features SO JOURNAL OF INFORMETRICS LA English DT Article DE Document ranking; Genetic programming; Classifier designing; LETOR; LAGEP ID INFORMATION-RETRIEVAL; CLASSIFIER AB The problem of ranking is a crucial task in the web information retrieval systems. The dynamic nature of information resources as well as the continuous changes in the information demands of the users has made it very difficult to provide effective methods for data mining and document ranking. Regarding these challenges, in this paper an adaptive ranking algorithm is proposed named GPRank. This algorithm which is a function discovery framework, utilizes the relatively simple features of web documents to provide suitable rankings using a multi-layer/multi-population genetic programming architecture. Experiments done, illustrate that GPRank has better performance in comparison with well-known ranking techniques and also against its full mode edition. (C) 2008 Elsevier Ltd. All rights reserved. C1 [Keyhanipour, Amir Hosein; Piroozmand, Maryam; Badie, Kambiz] ITRC, IT Res Fac, Tehran, Iran. RP Keyhanipour, AH (reprint author), 5 Zolfaghary Alley,Shadmehr St,Sattar Khan Ave,PO, Tehran, Iran. EM keyhanipour@yahoo.com CR ALMEIDA HM, 2007, P ANN INT ACM SIGIR, V30, P399 Bishop C. 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B., 1999, MODERN INFORM RETRIE Yeh J., 2007, P ACM SIGIR WORKSH L ZHAI C, 2001, P ANN INT ACM SIGIR, V24, P334 2008, WEBSITE LAGEP LAYERE 2008, WEBSITE LETOR DATASE NR 39 TC 2 Z9 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 1751-1577 J9 J INFORMETR JI J. Informetr. PD JAN PY 2009 VL 3 IS 1 BP 78 EP 89 DI 10.1016/j.joi.2008.11.006 PG 12 WC Information Science & Library Science SC Information Science & Library Science GA 395BI UT WOS:000262496700008 ER PT J AU Prabowo, R Thelwall, M AF Prabowo, Rudy Thelwall, Mike TI Finding and tracking subjects within an ongoing debate SO JOURNAL OF INFORMETRICS LA English DT Article DE feature selection; subject tracking ID NATURAL CATEGORIES; KNOWLEDGE; SEARCH; GRAPH; WEB AB This paper describes a new algorithm for finding and tracking different subjects within an ongoing debate. The algorithm finds blocks of co-occurring terms, representing subjects, including blocks for which the term co-occurrence pattern forms a ring topology. We used short online debate forum data and longer summary bulletins to assess the extent to which the algorithm could correctly detect subjects, according to the judgements of human evaluators. The results show that it could normally detect subject-shifting and track different subjects over time in online debate forums and with adjustments could find subjects in bulletins, but could not track the subjects in the bulletins because the interlinking between subjects was too dense in the longer documents. (C) 2008 Elsevier Ltd. All rights reserved. C1 [Prabowo, Rudy; Thelwall, Mike] Wolverhampton Univ, Sch Comp & Informat Technol, Wolverhampton WV1 1SB, England. RP Prabowo, R (reprint author), Wolverhampton Univ, Sch Comp & Informat Technol, Wulfruna St, Wolverhampton WV1 1SB, England. 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PD APR PY 2008 VL 2 IS 2 BP 107 EP 127 DI 10.1016/j.joi.2007.12.002 PG 21 WC Information Science & Library Science SC Information Science & Library Science GA 296TK UT WOS:000255568500001 ER PT J AU Borner, K Hardy, E Herr, B Holloway, T Paley, WB AF Borner, Katy Hardy, Elisha Herr, Bruce Holloway, Todd Paley, W. Bradford TI Taxonomy visualization in support of the semi-automatic validation and optimization of organizational schemas SO JOURNAL OF INFORMETRICS LA English DT Article DE patents; taxonomy; ontology; classification hierarchy; visualization AB Never before in history has mankind produced and had access to so much data, information, knowledge, and expertise as today. To organize, access, and manage these valuable assets effectively, we use taxonomies, classification hierarchies, ontologies, controlled vocabularies, and other approaches. We create directory structures for our files. We use organizational hierarchies to structure our work environment. However, the design and continuous update of these organizational schemas with potentially thousands of class nodes organizing millions of entities is challenging for any human being. The taxonomy visualization and validation (TV) tool introduced in this paper supports the semi-automatic validation and optimization of organizational schemas such as file directories, classification hierarchies, taxonomies, or other structures imposed on a data set for organization, access, and naming. By showing the "goodness of fit" for a schema and the potentially millions of entities it organizes, the TV tool eases the identification and reclassification of misclassified information entities, the identification of classes that grow too large, the evaluation of the size and homogeneity of existing classes, the examination of the "well-formedness" of an organizational schema, and more. As a demonstration, the TV tool is applied to display and examine the United States Patent and Trademark Office patent classification, which organizes more than three million patents into about 160,000 distinct patent classes. The paper concludes with a discussion and an outlook to future work. (c) 2007 Elsevier Ltd. All rights reserved. C1 [Borner, Katy; Hardy, Elisha; Herr, Bruce] Indiana Univ, SLIS, Wells Lib, Bloomington, IN 47405 USA. [Holloway, Todd] Indiana Univ, Dept Comp Sci, Bloomington, IN 47405 USA. RP Borner, K (reprint author), Indiana Univ, SLIS, Wells Lib, 10th St & Jordan Ave, Bloomington, IN 47405 USA. EM katy@indiana.edu CR Berners-Lee T, 2001, SCI AM, V284, P34 Borner K, 2003, ANNU REV INFORM SCI, V37, P179, DOI 10.1002/aris.1440370106 BORNER K, 2002, VISUAL INTERFACES DI Doms A, 2005, NUCLEIC ACIDS RES, V33, pW783, DOI 10.1093/nar/gki470 Goldstone R. 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SO JOURNAL OF INFORMETRICS LA English DT Article DE Evaluation; Citation analysis; Highly cited publications; Bibliometric rankings; Percentiles ID INDICATORS AB The percentile-based rating scale P100 describes the citation impact in terms of the distribution of unique citation values. This approach has recently been refined by considering also the frequency of papers with the same citation counts. Here I compare the resulting P100' with P100 for an empirical dataset and a simple fictitious model dataset. It is shown that P100' is not much different from standard percentile-based ratings in terms of citation frequencies. A new indicator P100 '' is introduced. (C) 2014 Elsevier Ltd. All rights reserved. C1 Tech Univ Chemnitz, Inst Phys, D-09107 Chemnitz, Germany. RP Schreiber, M (reprint author), Tech Univ Chemnitz, Inst Phys, D-09107 Chemnitz, Germany. EM schreiber@physik.tu-chemnitz.de CR Bornmann L., 2014, J ASSOC INF SCI TECH, V65, P1939 Bornmann L, 2013, J INFORMETR, V7, P933, DOI 10.1016/j.joi.2013.09.003 Leydesdorff L, 2012, J AM SOC INF SCI TEC, V63, P2349, DOI 10.1002/asi.22714 Leydesdorff L, 2011, J AM SOC INF SCI TEC, V62, P1370, DOI 10.1002/asi.21534 Leydesdorff L, 2011, J AM SOC INF SCI TEC, V62, P2133, DOI 10.1002/asi.21609 Pudovkin A. I., 2009, COLLNET J SCIENTOMET, V3, P3 Rousseau R, 2012, J AM SOC INF SCI TEC, V63, P416, DOI 10.1002/asi.21684 Schreiber M, 2013, J AM SOC INF SCI TEC, V64, P640, DOI 10.1002/asi.22752 Schreiber M, 2014, J INFORMETR, V8, P738, DOI 10.1016/j.joi.2014.06.007 Waltman L, 2013, J AM SOC INF SCI TEC, V64, P372, DOI 10.1002/asi.22775 NR 10 TC 1 Z9 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 1751-1577 EI 1875-5879 J9 J INFORMETR JI J. Informetr. PD OCT PY 2014 VL 8 IS 4 BP 997 EP 1004 DI 10.1016/j.joi.2014.10.001 PG 8 WC Information Science & Library Science SC Information Science & Library Science GA AU3QB UT WOS:000345527400019 ER PT J AU Abramo, G D'Angelo, CA AF Abramo, Giovanni D'Angelo, Ciriaco Andrea TI Assessing national strengths and weaknesses in research fields SO JOURNAL OF INFORMETRICS LA English DT Article DE Scientific standing; Research evaluation; Bibliometrics; Highly cited papers; Universities; Italy ID ACADEMIC RESEARCH; EXCELLENCE; PERFORMANCE; UNIVERSITY; SCIENCE; IMPACT AB National policies aimed at fostering the effectiveness of scientific systems should be based on reliable strategic analysis identifying strengths and weaknesses at field level. Approaches and indicators thus far proposed in the literature have not been completely satisfactory, since they fail to distinguish the effect of the size of production factors from that of their quality, particularly the quality of labor. The current work proposes an innovative "input-oriented" approach, which permits: (i) estimation of national research performance in a field and comparison to that of other nations, independent of the size of their respective research staffs; and, for fields of comparable intensity of publication, (ii) identification of the strong and weak research fields within a national research system on the basis of international comparison. In reference to the second objective, the proposed approach is applied to the Italian case, through the analysis of the 2006-2010 scientific production of the Italian academic system, in the 200 research fields where bibliometric analysis is meaningful. (C) 2014 Elsevier Ltd. All rights reserved. C1 [Abramo, Giovanni] Natl Res Council Italy, Inst Syst Anal & Comp Sci IASI CNR, Lab Studies Res & Technol Transfer, I-00185 Rome, Italy. [D'Angelo, Ciriaco Andrea] Univ Roma Tor Vergata, Dept Engn & Management, I-00133 Rome, Italy. RP Abramo, G (reprint author), Natl Res Council Italy, Inst Syst Anal & Comp Sci IASI CNR, Lab Studies Res & Technol Transfer, Viale Manzoni 30, I-00185 Rome, Italy. 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PD JUL PY 2014 VL 8 IS 3 BP 766 EP 775 DI 10.1016/j.joi.2014.07.002 PG 10 WC Information Science & Library Science SC Information Science & Library Science GA AO5IE UT WOS:000341376700028 ER PT J AU Bornmann, L Stefaner, M Anegon, FD Mutz, R AF Bornmann, Lutz Stefaner, Moritz de Moya Anegon, Felix Mutz, Ruediger TI What is the effect of country-specific characteristics on the research performance of scientific institutions? Using multi-level statistical models to rank and map universities and research-focused institutions worldwide SO JOURNAL OF INFORMETRICS LA English DT Article DE Scientific excellence; Highly cited papers; Geography of science; Spatial scientometrics; Google maps; University ranking ID BIBLIOMETRIC INDICATORS; SCIENCE; PUBLICATION; PERCENTILES; CORRUPTION; EXCELLENCE; DECISIONS; GEOGRAPHY AB Bornmann, Stefaner, de Moya Anegon, and Mutz (2014) have introduced a web application (www,excellencemappingmet) which is linked to both academic ranking lists published hitherto (e.g. the Academic Ranking of World Universities) as well as spatial visualization approaches. The web application visualizes institutional performance within specific subject areas as ranking lists and on custom tile-based maps. The new, substantially enhanced version of the web application and the generalized linear mixed model for binomial data on which it is based are described in this paper. Scopus data are used which have been collected for the SCImago Institutions Ranking. Only those universities and research-focused institutions are considered that have published at least 500 articles, reviews and conference papers in the period 2006-2010 in a certain Scopus subject area. In the enhanced version, the effect of single covariates (such as the per capita GDP of a country in which an institution is located) on two performance metrics (best paper rate and best journal rate) is examined and visualized. A covariate-adjusted ranking and mapping of the institutions is produced in which the single covariates are held constant. The results on the performance of institutions can then be interpreted as if the institutions all had the same value (reference point) for the covariate in question. For example, those institutions can be identified worldwide showing a very good performance despite a bad financial situation in the corresponding country. (C) 2014 Elsevier Ltd. All rights reserved. C1 [Bornmann, Lutz] Adm Headquarters Max Planck Soc, Div Sci & Innovat Studies, Munich, Germany. [de Moya Anegon, Felix] CSIC, Inst Publ Goods & Policies IPP, Madrid, Spain. [Mutz, Ruediger] ETH, Zurich, Switzerland. RP Bornmann, L (reprint author), Adm Headquarters Max Planck Soc, Div Sci & Innovat Studies, Munich, Germany. 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PD JUL PY 2014 VL 8 IS 3 BP 581 EP 593 DI 10.1016/j.joi.2014.04.008 PG 13 WC Information Science & Library Science SC Information Science & Library Science GA AO5IE UT WOS:000341376700012 ER PT J AU Bornmann, L AF Bornmann, Lutz TI h-Index research in scientometrics: A summary SO JOURNAL OF INFORMETRICS LA English DT Letter C1 Max Planck Gesell, Div Sci & Innovat Studies, Adm Headquarters, D-80539 Munich, Germany. RP Bornmann, L (reprint author), Max Planck Gesell, Div Sci & Innovat Studies, Adm Headquarters, Hofgartenstr 8, D-80539 Munich, Germany. EM bornmann@gv.mpg.de RI Bornmann, Lutz/A-3926-2008 OI Bornmann, Lutz/0000-0003-0810-7091 CR Bornmann L, 2011, J INFORMETR, V5, P346, DOI 10.1016/j.joi.2011.01.006 Bornmann L, 2012, RHEUMATOL INT, V32, P1861, DOI 10.1007/s00296-011-2276-1 Bornmann L, 2014, SCIENTOMETRICS, V98, P487, DOI 10.1007/s11192-013-1161-y Hirsch JE, 2005, P NATL ACAD SCI USA, V102, P16569, DOI 10.1073/pnas.0507655102 Waltman L, 2012, J AM SOC INF SCI TEC, V63, P406, DOI 10.1002/asi.21678 NR 5 TC 1 Z9 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 1751-1577 EI 1875-5879 J9 J INFORMETR JI J. Informetr. PD JUL PY 2014 VL 8 IS 3 BP 749 EP 750 DI 10.1016/j.joi.2014.07.004 PG 2 WC Information Science & Library Science SC Information Science & Library Science GA AO5IE UT WOS:000341376700026 ER PT J AU Cimenler, O Reeves, KA Skvoretz, J AF Cimenler, Oguz Reeves, Kingsley A. Skvoretz, John TI A regression analysis of researchers' social network metrics on their citation performance in a college of engineering SO JOURNAL OF INFORMETRICS LA English DT Article DE Collaborative networks; Social network analysis; Poisson regression; Self reported data; Citation-based research performance ID SCIENTIFIC COLLABORATION NETWORKS; CO-AUTHORSHIP NETWORKS; H-INDEX; PRODUCTIVITY; COAUTHORSHIP; INDIVIDUALS; EXPLORATION; STRATEGIES; CENTRALITY; KNOWLEDGE AB Previous research shows that researchers' social network metrics obtained from a collaborative output network (e.g., joint publications or co-authorship network) impact their performance determined by g-index. We use a richer dataset to show that a scholar's performance should be considered with respect to position in multiple networks. Previous research using only the network of researchers' joint publications shows that a researcher's distinct connections to other researchers, a researcher's number of repeated collaborative outputs, and a researchers' redundant connections to a group of researchers who are themselves well-connected has a positive impact on the researchers' performance, while a researcher's tendency to connect with other researchers who are themselves well-connected (i.e., eigenvector centrality) had a negative impact on the researchers' performance. Our findings are similar except that we find that eigenvector centrality has a positive impact on the performance of scholars. Moreover, our results demonstrate that a researcher's tendency toward dense local neighborhoods and the researchers' demographic attributes such as gender should also be considered when investigating the impact of the social network metrics on the performance of researchers. (C) 2014 Elsevier Ltd. All rights reserved. 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PD JUL PY 2014 VL 8 IS 3 BP 667 EP 682 DI 10.1016/j.joi.2014.06.004 PG 16 WC Information Science & Library Science SC Information Science & Library Science GA AO5IE UT WOS:000341376700020 ER PT J AU Franceschini, F Maisano, D Mastrogiacomo, L AF Franceschini, Fiorenzo Maisano, Domenico Mastrogiacomo, Luca TI Scientific journal publishers and omitted citations in bibliometric databases: Any relationship? SO JOURNAL OF INFORMETRICS LA English DT Article DE Bibliometric database; Database errors; Omitted citations; Scientific journal publisher; Error correction; Manufacturing Engineering AB Omitted citations - i.e., missing links between a cited paper and the corresponding citing papers - are the main consequence of several bibliometric database errors. This paper investigates the possible relationship between omitted citations and publishers of the relevant citing papers. This relationship is potentially meaningful because: (i) publishers generally impose editorial styles, which could affect database errors, and (ii) some publishers may be more efficient than others in detecting and correcting pre-existing errors in the manuscripts to be published, reducing the risk of database errors. Based on an extensive sample of scientific papers in the Manufacturing Engineering field, this study examines the citations omitted by the Scopus and WoS databases, using a recent automated algorithm. Major results are that: (i) there are significant differences in terms of omitted-citation rate between publishers and (ii) the omitted-citation rates of publishers may vary depending on the database in use. (C) 2014 Elsevier Ltd. All rights reserved. C1 [Franceschini, Fiorenzo; Maisano, Domenico; Mastrogiacomo, Luca] Politecn Torino, DIGEP Dept Management & Prod Engn, I-10129 Turin, Italy. RP Franceschini, F (reprint author), Politecn Torino, DIGEP Dept Management & Prod Engn, Corso Duca Abruzzi 24, I-10129 Turin, Italy. EM fiorenzo.franceschini@polito.it; domenico.maisano@polito.it; luca.mastrogiacomo@polito.it RI MAISANO, Domenico/B-4301-2010 OI MAISANO, Domenico/0000-0002-8154-4469 CR Adam D, 2002, NATURE, V415, P726 [Anonymous], 1997, 41997 ISO Buchanan RA, 2006, COLL RES LIBR, V67, P292 Franceschini F., 2014, INT J PRODUCTION EC Franceschini F, 2011, J INFORMETR, V5, P64, DOI 10.1016/j.joi.2010.08.003 Franceschini F, 2013, J AM SOC INF SCI TEC, V64, P2149, DOI 10.1002/asi.22898 Jacso P, 2006, ONLINE INFORM REV, V30, P297, DOI 10.1108/14684520610675816 Jacso P, 2012, SCIENTOMETRICS, V92, P325, DOI 10.1007/s11192-012-0769-7 Labbe C., 2010, ISSI NEWSLETTER, V6, P48 Li J., 2010, J ELECT RESOURCES ME, V7, P196, DOI DOI 10.1080/15424065.2010.505518 Maisano D., 2011, QUALITY RELIABILITY, V27, P969 Montgomery D. 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TI Reversing the byline hierarchy: The effect of equalizing bias on the accreditation of primary, secondary and senior authors SO JOURNAL OF INFORMETRICS LA English DT Article DE Coauthor credit; Harmonic formula; Equalizing bias; Bibliometric counting; Senior authorship ID H-INDEX; CREDIT; PUBLICATION; CITATION; 1ST AB Equalizing bias (EqB) is a systematic inaccuracy which arises when authorship credit is divided equally among coauthors who have not contributed equally. As the number of coauthors increases, the diminishing amount of credit allocated to each additional coauthor is increasingly composed of equalizing bias such that when the total number of coauthors exceeds 12, the credit score of most coauthors is composed mostly of EqB. In general, EqB reverses the byline hierarchy and skews bibliometric assessments by underestimating the contribution of primary authors, i.e. those adversely affected by negative EqB, and overestimating the contribution of secondary authors, those benefitting from positive EqB. The positive and negative effects of EqB are balanced and sum to zero, but are not symmetrical. The lack of symmetry exacerbates the relative effects of EqB, and explains why primary authors are increasingly outnumbered by secondary authors as the number of coauthors increases. Specifically, for a paper with 50 coauthors, the benefit of positive EqB goes to 39 secondary authors while the burden of negative EqB befalls 11 primary authors. Relative to harmonic estimates of their actual contribution, the EqB of the 50 coauthors ranged from < -90% to > 350%. Senior authorship, when it occurs, is conventionally indicated by a corresponding last author and recognized as being on a par with a first author. If senior authorship is not recognized, then the credit lost by an unrecognized senior author is distributed among the other coauthors as part of their EqB. The powerful distortional effect of EqB is compounded in bibliometric indices and performance rankings derived from biased equal credit. Equalizing bias must therefore be corrected at the source by ensuring accurate accreditation of all coauthors prior to the calculation of aggregate publication metrics. (C) 2014 The Authors. Published by Elsevier Ltd. C1 Univ Nordland, Fac Biosci & Aquaculture, N-8049 Bodo, Norway. RP Hagen, NT (reprint author), Univ Nordland, Fac Biosci & Aquaculture, N-8049 Bodo, Norway. 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Bornmann, Lutz TI The European Union, China, and the United States in the top-1% and top-10% layers of most-frequently cited publications: Competition and collaborations SO JOURNAL OF INFORMETRICS LA English DT Article DE World share; Citation analysis; Excellence Europe; USA; China ID SCIENCE-CITATION-INDEX; SCIENTIFIC COLLABORATION; INTERNATIONAL COLLABORATION; RELATIVE INDICATORS; BRITISH SCIENCE; ASSESSMENTS; COOPERATION; PERFORMANCE; EXCELLENCE; DECLINE AB The percentages of shares of world publications of the European Union and its member states, China, and the United States have been represented differently as a result of using different databases. An analytical variant of the Web-of-Science (of Thomson Reuters) enables us to study the dynamics in the world publication system in terms of the field-normalized top-1% and top-10% most-frequently cited publications. 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PD JUL PY 2014 VL 8 IS 3 BP 606 EP 617 DI 10.1016/j.joi.2014.05.002 PG 12 WC Information Science & Library Science SC Information Science & Library Science GA AO5IE UT WOS:000341376700014 ER PT J AU Li, J Shi, DB Zhao, SX Ye, FY AF Li, Jiang Shi, Dongbo Zhao, Star X. Ye, Fred Y. TI A study of the "heartbeat spectra" for "sleeping beauties" SO JOURNAL OF INFORMETRICS LA English DT Article DE Sleeping beauty; Heartbeat spectrum; Citation pattern; G(s) index; Gini coefficient ID DELAYED RECOGNITION; SOCIAL-SCIENCES; SCIENTIFIC DISCOVERY; CITATION PATTERNS; CITED PAPERS; TIME; OBSOLESCENCE; UNCITEDNESS; HUMANITIES; NETWORKS AB We first introduced interesting definitions of "heartbeat" and "heartbeat spectrum" for "sleeping beauties", based on van Raan's variables. Then, we investigated 58,963 papers of Nobel laureates during 1900-2000 and found 758 sleeping beauties. 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V., 1961, PERSPECTIVES BIOL ME, V18, P149 ZIRKLE C, 1964, J HERED, V55, P65 NR 52 TC 1 Z9 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 1751-1577 EI 1875-5879 J9 J INFORMETR JI J. Informetr. PD JUL PY 2014 VL 8 IS 3 BP 493 EP 502 DI 10.1016/j.joi.2014.04.002 PG 10 WC Information Science & Library Science SC Information Science & Library Science GA AO5IE UT WOS:000341376700005 ER PT J AU Nykl, M Jezek, K Fiala, D Dostal, M AF Nykl, Michal Jezek, Karel Fiala, Dalibor Dostal, Martin TI PageRank variants in the evaluation of citation networks SO JOURNAL OF INFORMETRICS LA English DT Article DE PageRank; Citation analysis; Research evaluation; Author ranking; ISI Web of Science AB This paper explores a possible approach to a research evaluation, by calculating the renown of authors of scientific papers. The evaluation is based on the citation analysis and its results should be close to a human viewpoint. The PageRank algorithm and its modifications were used for the evaluation of various types of citation networks. Our main research question was whether better evaluation results were based directly on an author network or on a publication network. Other issues concerned, for example, the determination of weights in the author network and the distribution of publication scores among their authors. The citation networks were extracted from the computer science domain in the ISI Web of Science database. The influence of self-citations was also explored. To find the best network for a research evaluation, the outputs of PageRank were compared with lists of prestigious awards in computer science such as the Turing and Codd award, ISI Highly Cited and ACM Fellows. Our experiments proved that the best ranking of authors was obtained by using a publication citation network from which self-citations were eliminated, and by distributing the same proportional parts of the publications' values to their authors. The ranking can be used as a criterion for the financial support of research teams, for identifying leaders of such teams, etc. (C) 2014 Elsevier Ltd. All rights reserved. C1 [Nykl, Michal; Jezek, Karel; Fiala, Dalibor; Dostal, Martin] Univ W Bohemia, Dept Comp Sci & Engn, Plzen 30614, Czech Republic. RP Fiala, D (reprint author), Univ W Bohemia, Dept Comp Sci & Engn, Univ 8, Plzen 30614, Czech Republic. EM nyklm@kiv.zcu.cz; jezek_ka@kiv.zcu.cz; dalfia@kiv.zcu.cz; madostal@kiv.zcu.cz RI Fiala, Dalibor/C-8690-2012 OI Fiala, Dalibor/0000-0002-2528-771X CR Assimakis N, 2010, SCIENTOMETRICS, V85, P415, DOI 10.1007/s11192-010-0255-z Bollen J, 2006, SCIENTOMETRICS, V69, P669, DOI 10.1007/s11192-006-0176-z Brin S, 1998, COMPUT NETWORKS ISDN, V30, P107, DOI 10.1016/S0169-7552(98)00110-X Ding Y, 2011, J AM SOC INF SCI TEC, V62, P236, DOI 10.1002/asi.21452 Fiala D, 2012, J INFORMETR, V6, P370, DOI 10.1016/j.joi.2012.02.002 Fiala D., 2011, SCIENTOMETRICS, V86, P1 GARFIELD E, 1972, SCIENCE, V178, P471, DOI 10.1126/science.178.4060.471 Glanzel W, 2001, SCIENTOMETRICS, V51, P69, DOI 10.1023/A:1010512628145 Kleinberg JM, 1999, J ACM, V46, P604, DOI 10.1145/324133.324140 Langville A. N., 2006, MATH GOOGLES PAGERAN Lin LL, 2013, SCIENTOMETRICS, V97, P797, DOI 10.1007/s11192-013-0988-6 Sidiropoulos A, 2006, J SYST SOFTWARE, V79, P1679, DOI 10.1016/j.jss.2006.01.011 Yan E., 2010, J AM SOC INFORM SCI, V62, P467 Yan EJ, 2012, J AM SOC INF SCI TEC, V63, P1313, DOI 10.1002/asi.22680 Yu K., 2012, J THEORETICAL APPL I, V44, P308 Zhao D., 2005, P AM SOC INFORM SCI, V42 NR 16 TC 1 Z9 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 1751-1577 EI 1875-5879 J9 J INFORMETR JI J. Informetr. PD JUL PY 2014 VL 8 IS 3 BP 683 EP 692 DI 10.1016/j.joi.2014.06.005 PG 10 WC Information Science & Library Science SC Information Science & Library Science GA AO5IE UT WOS:000341376700021 ER PT J AU Rousseau, R Liu, YX Guns, R AF Rousseau, Ronald Liu, Yuxian Guns, Raf TI Mathematical properties of Q-measures (vol 7, pg 737, 2013) SO JOURNAL OF INFORMETRICS LA English DT Correction DE Network theory; Q-measures; Betweenness centrality AB A correction is provided for the proof of a theorem announced in (Rousseau et al., 2013). We show, moreover, that in a network subdivided into three or more subgroups there is at most one node with global Q-measure equal to one. In case there are two subgroups then it is possible to have two nodes with global Q-measure equal to one. This characterization leads to a graphical representation of networks having the maximum possible number of nodes with Q-measure equal to one. (C) 2014 Elsevier Ltd. All rights reserved. C1 [Rousseau, Ronald; Guns, Raf] Univ Antwerp, IBW, Inst Educ & Informat Sci, B-2000 Antwerp, Belgium. [Rousseau, Ronald] Katholieke Univ Leuven, Dept Math, B-3000 Leuven, Belgium. [Liu, Yuxian] Tongji Univ, Lib Tongji Univ, Shanghai 200092, Peoples R China. [Liu, Yuxian] Univ Sussex, Sch Business Management & Econ, SPRU, Brighton BN1 9SL, E Sussex, England. RP Guns, R (reprint author), Univ Antwerp, IBW, Inst Educ & Informat Sci, Venusstr 35, B-2000 Antwerp, Belgium. EM ronald.rousseau@uantwerpen.be; yxliu@lib.tongji.edu.cn; raf.guns@uantwerpen.be CR Flom P. L., 2004, CONNECTIONS, V26, P62 Rousseau R, 2013, J INFORMETR, V7, P737, DOI 10.1016/j.joi.2013.06.002 Rousseau R., 2005, PROCEEDINGS OF THE 6, P675 Rousseau R., 2014, PROCEEDINGS OF THE 8 NR 4 TC 1 Z9 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 1751-1577 EI 1875-5879 J9 J INFORMETR JI J. Informetr. PD JUL PY 2014 VL 8 IS 3 BP 486 EP 490 DI 10.1016/j.joi.2014.01.004 PG 5 WC Information Science & Library Science SC Information Science & Library Science GA AO5IE UT WOS:000341376700003 ER PT J AU Rousseau, R AF Rousseau, Ronald TI Comments on "Impact coverage of the success-index" by Leo Egghe SO JOURNAL OF INFORMETRICS LA English DT Letter AB We clarify the content of the article "Impact coverage of the success-index" by Leo Egghe and show that its real contribution is showing that for a Lotkaian system it is possible to determine a threshold value as a function of the system's parameters such that the value of the success-index corresponding to this threshold value is equal to the h-index and similar indices. It is observed that these results do not strictly hold in discrete systems. (C) 2014 Elsevier Ltd. All rights reserved. C1 [Rousseau, Ronald] Univ Antwerp, IOIW IBW, B-2000 Antwerp, Belgium. [Rousseau, Ronald] Katholieke Univ Leuven, Dept Math, Leuven, Belgium. RP Rousseau, R (reprint author), Katholieke Univ Leuven, Dept Math, Leuven, Belgium. EM ronald.rousseau@uantwerpen.be CR Apostol T., 1967, CALCULUS, V1 Egghe L, 2014, J INFORMETR, V8, P384, DOI 10.1016/j.joi.2014.01.005 Franceschini F, 2013, J INFORMETR, V7, P109, DOI 10.1016/j.joi.2012.09.008 Franceschini F, 2012, SCIENTOMETRICS, V92, P621, DOI 10.1007/s11192-011-0570-z Waltman L, 2012, J AM SOC INF SCI TEC, V63, P406, DOI 10.1002/asi.21678 NR 5 TC 1 Z9 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 1751-1577 EI 1875-5879 J9 J INFORMETR JI J. Informetr. PD JUL PY 2014 VL 8 IS 3 BP 491 EP 492 DI 10.1016/j.joi.2014.04.003 PG 2 WC Information Science & Library Science SC Information Science & Library Science GA AO5IE UT WOS:000341376700004 ER PT J AU Wang, XW Wang, Z Mao, WL Liu, C AF Wang, Xianwen Wang, Zhi Mao, Wenli Liu, Chen TI How far does scientific community look back? SO JOURNAL OF INFORMETRICS LA English DT Article DE Article usage; Alt mertics; Download; Static usage data; Dynamic usage data; Lifetime of scientific literature ID INFORMATION-SEEKING BEHAVIOR; SCIENCE; GROWTH AB How does the published scientific literature used by scientific community? Many previous studies make analysis on the static usage data. In this research, we propose the concept of dynamic usage data. Based on the platform of realtime.springer.com, we have been monitoring and recording the dynamic usage data of Scientometrics articles round the clock. Our analysis find that papers published in recent four years have many more downloads than papers published four years ago. According to our quantitative calculation, papers downloaded on one day have an average lifetime of 4.1 years approximately. Classic papers are still being downloaded frequently even long after their publication. Additionally, we find that social media may reboot the attention of old scientific literature in a short time. (C) 2014 Elsevier Ltd. All rights reserved. C1 [Wang, Xianwen; Wang, Zhi; Mao, Wenli; Liu, Chen] Dalian Univ Technol, Fac Humanities & Social Sci, WISE Lab, Dalian 116085, Peoples R China. [Wang, Xianwen; Wang, Zhi; Mao, Wenli; Liu, Chen] Dalian Univ Technol, Sch Publ Adm & Law, Dalian 116085, Peoples R China. [Wang, Xianwen] Dalian Univ Technol, DUT Drexel Joint Inst Study Knowledge Visualizat, Dalian 116085, Peoples R China. RP Wang, XW (reprint author), Dalian Univ Technol, Fac Humanities & Social Sci, WISE Lab, Dalian 116085, Peoples R China. 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PD JUL PY 2014 VL 8 IS 3 BP 562 EP 568 DI 10.1016/j.joi.2014.04.009 PG 7 WC Information Science & Library Science SC Information Science & Library Science GA AO5IE UT WOS:000341376700010 ER PT J AU Dorta-Gonzalez, P Dorta-Gonzalez, MI Santos-Penate, DR Suarez-Vega, R AF Dorta-Gonzalez, Pablo Isabel Dorta-Gonzalez, Maria Rosa Santos-Penate, Dolores Suarez-Vega, Rafael TI Journal topic citation potential and between-field comparisons: The topic normalized impact factor SO JOURNAL OF INFORMETRICS LA English DT Article DE Journal assessment; Journal metric; Bibliometric indicator; Citation analysis; Journal impact factor; Source normalization; Citation potential ID INDICATORS; SCIENCE; TERMS; TIME; TOOL AB The journal impact factor is not comparable among fields of science and social science because of systematic differences in publication and citation behavior across disciplines. In this work, a source normalization of the journal impact factor is proposed. We use the aggregate impact factor of the citing journals as a measure of the citation potential in the journal topic, and we employ this citation potential in the normalization of the journal impact factor to make it comparable between scientific fields. An empirical application comparing some impact indicators with our topic normalized impact factor in a set of 224 journals from four different fields shows that our normalization, using the citation potential in the journal topic, reduces the betwen-group variance with respect to the within-group variance in a higher proportion than the rest of indicators analyzed. The effect of journal self-citations over the normalization process is also studied. (C) 2014 Elsevier Ltd. All rights reserved. C1 [Dorta-Gonzalez, Pablo; Rosa Santos-Penate, Dolores; Suarez-Vega, Rafael] Univ Las Palmas Gran Canaria, Inst Turismo & Desarrollo Econ Sostenible Tides, Las Palmas Gran Canaria, Spain. [Isabel Dorta-Gonzalez, Maria] Univ La Laguna, Dept Estadist Invest Operat & Comp, E-38207 San Cristobal la Laguna, Spain. RP Dorta-Gonzalez, P (reprint author), Univ Las Palmas Gran Canaria, Inst Turismo & Desarrollo Econ Sostenible Tides, Las Palmas Gran Canaria, Spain. 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Informetr. PD APR PY 2014 VL 8 IS 2 BP 406 EP 418 DI 10.1016/j.joi.2014.01.013 PG 13 WC Information Science & Library Science SC Information Science & Library Science GA AG7PK UT WOS:000335609900011 ER PT J AU Vieira, ES Cabral, JAS Gomes, JANF AF Vieira, Elizabeth S. Cabral, Jose A. S. Gomes, Jose A. N. F. TI How good is a model based on bibliometric indicators in predicting the final decisions made by peers? SO JOURNAL OF INFORMETRICS LA English DT Article DE Peer-review; Bibliometric indicators; Predictive power; Auxiliary instrument ID GRANT PROPOSALS; RELIABILITY; EXPERIENCE; VALIDITY; REVIEWS; SYSTEMS; PHYSICS; INDEX AB This paper shows how bibliometric models can be used to assist peers in selecting candidates for academic openings. Several studies have demonstrated that a relationship exists between results from peer-review evaluations and results obtained with certain bibliometric indicators. However, very little has been done to analyse the predictive power of models based on bibliometric indicators. Indicators with high predictive power will be seen as good instruments to support peer evaluations. The goal of this study is to assess the predictive power of a model based on bibliometric indicators for the results of academic openings at the level of Associado and Catedratico at Portuguese universities. Our results suggest that the model can predict the results of peer-review at this level with a reasonable degree of accuracy. This predictive power is better when only the scientific performance is assessed by peers. (C) 2014 Elsevier Ltd. All rights reserved. C1 [Vieira, Elizabeth S.; Gomes, Jose A. N. F.] Univ Porto, Fac Ciencias, REQUIMTE Dept Quim & Bioquim, P-4169007 Oporto, Portugal. [Vieira, Elizabeth S.] Univ Porto, Fac Engn, Dept Engn Ind & Gestao, P-4200465 Oporto, Portugal. [Cabral, Jose A. S.] Univ Porto, Fac Engn, INESC TEC, P-4200465 Oporto, Portugal. 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Informetr. PD APR PY 2014 VL 8 IS 2 BP 390 EP 405 DI 10.1016/j.joi.2014.01.012 PG 16 WC Information Science & Library Science SC Information Science & Library Science GA AG7PK UT WOS:000335609900010 ER PT J AU Abramo, G Cicero, T D'Angelo, CA AF Abramo, Giovanni Cicero, Tindaro D'Angelo, Ciriaco Andrea TI Are the authors of highly cited articles also the most productive ones? SO JOURNAL OF INFORMETRICS LA English DT Article DE Bibliometrics; Research evaluation; Research productivity; Top scientists; Highly cited articles; University ID BIBLIOMETRIC INDICATORS; RESEARCH PERFORMANCE; CITATION ANALYSIS; TOP; INDEX; UNIVERSITIES; SCIENTISTS; EXCELLENCE; FIELD; SCIENCES AB Ever more frequently, governments have decided to implement policy measures intended to foster and reward excellence in scientific research. This is in fact the intended purpose of national research assessment exercises. These are typically based on the analysis of the quality of the best research products; however, a different approach to analysis and intervention is based on the measure of productivity of the individual scientists, meaning the. overall impact of their entire scientific production over the period under observation. This work analyzes the convergence of the two approaches, asking if and to what measure the most productive scientists achieve highly cited articles; or vice versa, what share of highly cited articles is achieved by scientists that are "non-top" for productivity. To do this we use bibliometric indicators, applied to the 2004-2008 publications authored by academics of Italian universities and indexed in the Web of Science. (C) 2013 Elsevier Ltd. All rights reserved. C1 [Abramo, Giovanni; D'Angelo, Ciriaco Andrea] Natl Res Council Italy, CNR, Inst Syst Anal & Comp Sci IASI, Lab Studies Res & Technol Transfer, Rome, Italy. [Cicero, Tindaro] Italian Natl Agcy Evaluat Univ & Res Inst ANVUR, Rome, Italy. [D'Angelo, Ciriaco Andrea] Univ Roma Tor Vergata, Dept Management & Engn, Rome, Italy. RP Abramo, G (reprint author), Natl Res Council Italy, CNR, Inst Syst Anal & Comp Sci IASI, Lab Studies Res & Technol Transfer, Rome, Italy. EM giovanni.abramo@uniroma2.it CR Abramo G, 2012, J INFORMETR, V6, P470, DOI 10.1016/j.joi.2012.03.005 Abramo G, 2013, J INFORMETR, V7, P198, DOI 10.1016/j.joi.2012.11.003 Abramo G, 2007, CURR SCI INDIA, V93, P762 Abramo G, 2008, RES EVALUAT, V17, P111, DOI 10.3152/095820208X280916 Abramo G, 2009, SCIENTOMETRICS, V81, P137, DOI 10.1007/s11192-008-2131-7 Abramo G, 2013, J INFORMETR, V7, P528, DOI 10.1016/j.joi.2013.01.013 Abramo G, 2011, J INFORMETR, V5, P618, DOI 10.1016/j.joi.2011.06.001 Abramo G, 2009, EVALUATION REV, V33, P159, DOI 10.1177/0193841X08322871 Abramo G, 2011, SCIENTOMETRICS, V86, P629, DOI 10.1007/s11192-010-0284-7 Baccini A, 2012, J INFORMETR, V6, P721, DOI 10.1016/j.joi.2012.07.009 Bland JM, 2000, BRIT MED J, V320, P1468, DOI 10.1136/bmj.320.7247.1468 Bornmann L., 2007, INT J SCIENTOMETRICS, V11 Bornmann L, 2011, J AM SOC INF SCI TEC, V62, P1954, DOI 10.1002/asi.21611 Butler L, 2007, SCI PUBL POLICY, V34, P565, DOI DOI 10.3152/030234207X254404 Cho K. 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Informetr. PD JAN PY 2014 VL 8 IS 1 BP 89 EP 97 DI 10.1016/j.joi.2013.10.011 PG 9 WC Information Science & Library Science SC Information Science & Library Science GA AB4PH UT WOS:000331771900009 ER PT J AU An, L Yu, CM Li, G AF An, Lu Yu, Chuanming Li, Gang TI Visual topical analysis of Chinese and American Library and Information Science research institutions SO JOURNAL OF INFORMETRICS LA English DT Article DE Self-Organizing Map; Compound Component Plane; Topical analysis; Research institution ID SELF-ORGANIZING MAP; VISUALIZATION; DOMAIN AB Research institutions play an important role in scientific research and technical innovation. The topical analysis of research institutions in different countries can facilitate mutual learning and promote potential collaboration. In this study, we illustrate how an unsupervised artificial neural network technique Self-Organizing Map (SOM) can be used to visually analyze the research fields of research institutions. A novel SOM display named Compound Component Plane (CCP) was presented and applied to determine the institutions which made significant contributions to the salient research fields. Eighty-seven Chinese and American LIS institutions and the technical LIS fields were taken as examples. Potential international and domestic collaborators were identified based upon their research similarities. An approach of dividing research institutions into clusters was proposed based on their geometric distances in the SOM display, the U-matrix values and the most salient research topics they involved. The concepts of swarm institutions, pivots and landmarks were also defined and their instances were identified. (C) 2013 Elsevier Ltd. All rights reserved. C1 [An, Lu; Li, Gang] Wuhan Univ, Sch Informat Management, Wuhan 430072, Hubei Province, Peoples R China. [Yu, Chuanming] Zhongnan Univ Econ & Law, Sch Informat & Safety Engn, Wuhan 430073, Peoples R China. RP Yu, CM (reprint author), Zhongnan Univ Econ & Law, Sch Informat & Safety Engn, 182 Nanhu Ave, Wuhan 430073, Peoples R China. EM anlu97@163.com; yuchuanming2003@126.com; imiswhu@aliyun.com CR An L, 2011, KNOWL ORGAN, V38, P299 An L., 2012, INT J COMPUT INF SCI, V4, P83 [Anonymous], 2011, BEST GRADUATE SCH LI [Anonymous], 2012, SOM NORM VARIABLE Blessinger K, 2010, LIBR INFORM SCI RES, V32, P156, DOI 10.1016/j.lisr.2009.12.007 Boyack KW, 2003, J AM SOC INF SCI TEC, V54, P447, DOI 10.1002/asi.10230 Boyack KW, 2009, SCIENTOMETRICS, V79, P27, DOI 10.1007/s11192-009-0402-6 Chen CM, 2004, P NATL ACAD SCI USA, V101, P5303, DOI 10.1073/pnas.0307513100 Daigle R. 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Informetr. PD JAN PY 2014 VL 8 IS 1 BP 217 EP 233 DI 10.1016/j.joi.2013.12.002 PG 17 WC Information Science & Library Science SC Information Science & Library Science GA AB4PH UT WOS:000331771900020 ER PT J AU Bornmann, L Leydesdorff, L AF Bornmann, Lutz Leydesdorff, Loet TI On the meaningful and non-meaningful use of reference sets in bibliometrics SO JOURNAL OF INFORMETRICS LA English DT Letter ID H-INDEX; GOOGLE SCHOLAR; PUBLICATION; VARIANTS; ASSESSMENTS; VALIDATION; IMPACT C1 [Bornmann, Lutz] Adm Headquarters Max Planck Soc, Div Sci & Innovat Studies, D-80539 Munich, Germany. [Leydesdorff, Loet] Univ Amsterdam, Amsterdam Sch Commun Res ASCoR, NL-1012 CX Amsterdam, Netherlands. RP Bornmann, L (reprint author), Adm Headquarters Max Planck Soc, Div Sci & Innovat Studies, Hofgartenstr 8, D-80539 Munich, Germany. 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Informetr. PD JAN PY 2014 VL 8 IS 1 BP 273 EP 275 DI 10.1016/j.joi.2013.12.006 PG 3 WC Information Science & Library Science SC Information Science & Library Science GA AB4PH UT WOS:000331771900025 ER PT J AU Boyack, KW Patek, M Ungar, LH Yoon, P Klavans, R AF Boyack, Kevin W. Patek, Michael Ungar, Lyle H. Yoon, Patrick Klavans, Richard TI Classification of individual articles from all of science by research level SO JOURNAL OF INFORMETRICS LA English DT Article DE Research level; Basic science; Applied science; Multinomial logistic regression model; Article-level classification ID BIOMEDICAL-RESEARCH; JOURNALS AB A system of four research levels, designed to classify scientific journals from most applied to most basic, was introduced by Francis Narin and colleagues in the 1970s. Research levels have been used since that time to characterize research at institutional and departmental levels. Currently, less than half of all articles published are in journals that been classified by research level. There is thus a need for the notion of research level to be extended in a way that all articles can be so classified. This article reports on a new model - trained from title and abstract words and cited references - that classifies individual articles by research level. The model covers all of science, and has been used to classify over 25 million articles from Scopus by research level. The final model and set of classified articles are further characterized. (C) 2013 Elsevier Ltd. All rights reserved. C1 [Boyack, Kevin W.] SciTech Strategies Inc, Albuquerque, NM 87122 USA. [Patek, Michael] SciTech Strategies Inc, Keene, NH 03431 USA. [Ungar, Lyle H.; Yoon, Patrick] Univ Penn, Dept Comp & Informat Sci, Philadelphia, PA 19104 USA. [Klavans, Richard] SciTech Strategies Inc, Berwyn, PA 19312 USA. RP Boyack, KW (reprint author), SciTech Strategies Inc, Albuquerque, NM 87122 USA. 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PD JAN PY 2014 VL 8 IS 1 BP 1 EP 12 DI 10.1016/j.joi.2013.10.005 PG 12 WC Information Science & Library Science SC Information Science & Library Science GA AB4PH UT WOS:000331771900001 ER PT J AU Finardi, U AF Finardi, Ugo TI On the time evolution of received citations, in different scientific fields: An empirical study SO JOURNAL OF INFORMETRICS LA English DT Article DE Mean received citations; Medians of citations; Scientific fields; Received citations trends; Chemistry; Management ID JOURNAL IMPACT FACTOR; PUBLICATIONS; SCIENCE; INDEX; MODEL AB The time evolution of mean received citations is calculated on a sample of journals from two ISI subject categories ("Chemistry, multidisciplinary", ISI Science Edition, and "Management", ISI Social Science edition) with the use of an original methodology. Mean received citations are plotted against the time gap in years existing between publication of the cited article and received citations. For most Chemistry journals in the sample the maximum number of average received citations occurs two years after publication, and then a decrease is experimented. Some peculiar cases present a different trend. Management journals, conversely, do not present in most cases a peak of citations: average received citations instead grow from year of publication to the age of 10 years (maximum time gap studied). A sub-sample of journals show similar results for longer time series (up to 23 years). Medians of average received citations per year partly show a similar behavior. Results suggest that citedness follows very different trends in very different fields, and partly suggest why differences in journal Impact Factor exist between different categories. At the end of the work conclusions are drawn, together with suggestions for future research. (C) 2013 Elsevier Ltd. All rights reserved. C1 [Finardi, Ugo] CNR CERIS, Natl Res Council Italy, Inst Econ Res Firm & Growth, I-10024 Moncalieri, TO, Italy. [Finardi, Ugo] Univ Turin, Dept Chem, I-10125 Turin, Italy. RP Finardi, U (reprint author), CNR CERIS, Natl Res Council Italy, Inst Econ Res Firm & Growth, Via Real Coll 30, I-10024 Moncalieri, TO, Italy. 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PD JAN PY 2014 VL 8 IS 1 BP 13 EP 24 DI 10.1016/j.joi.2013.10.003 PG 12 WC Information Science & Library Science SC Information Science & Library Science GA AB4PH UT WOS:000331771900002 ER PT J AU Goldman, AW AF Goldman, Alyssa W. TI Conceptualizing the interdisciplinary diffusion and evolution of emerging fields: The case of systems biology SO JOURNAL OF INFORMETRICS LA English DT Article DE Diffusion; Interdisciplinarity; Network analysis; Systems biology ID INTERNATIONAL COLLABORATION; NETWORK ANALYSIS; SCIENCE; COMMUNICATION; PERSPECTIVES; INNOVATION; CITATIONS; FRAMEWORK; MEDICINE; JOURNALS AB This paper contributes to the longitudinal study and representation of the diffusion of scholarly knowledge through bibliometrics. The case of systems biology is used to illustrate a means for considering the structure and different roles of journals in the diffusion of a relatively new field to diverse subject areas. Using a bipartite network analysis of journals and subject categories, a core-intermediary-periphery diffusion structure is detected through comparative analysis of betweenness centrality over time. Systems biology diffuses from a core of foundational, theoretical areas to more specific, applied, practical fields, most of which relate to human health. Next, cluster analysis is applied to subject category co-occurrence networks to longitudinally trace the movement of fields within the core-intermediary-periphery structure. The results of these analyses reveal patterns of systems biology's diffusion across both theoretical and applied fields, and are also used to suggest how the dynamics of a field's interdisciplinary evolution can be realized. The author concludes by presenting a typology for considering how journals may function to support attributes of the core-intermediary-periphery structure and diffusion patterns more broadly. (C) 2013 Elsevier Ltd. All rights reserved. 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This has contributed to the understanding of the mechanisms and drivers, but actual transfer mechanism and process, be they through codified or tacit sources, have very rarely been mapped and measured to completeness and remain, to a large extent, a black box. We develop a novel method for mapping science-technology flows and introduce 'concept clusters' as an instrument to do so. Using patent and publication data, we quantitatively and visually demonstrate the flows of knowledge between academia and industry. We examine the roles of exogenous and endogenous knowledge sources, and of co-inventors and co-authors in the application of university-generated knowledge. When applied to a stylised case, we show that the method is able to trace the linkages between base knowledge and skill sets and their application to a technology, which in some instances span over twenty-five years. (C) 2014 Elsevier Ltd. All rights reserved. C1 [Gurney, Thomas; Horlings, Edwin] Rathenau Inst, NL-2593 HW The Hague, Netherlands. [van den Besselaar, Peter] Vrije Univ Amsterdam, Network Inst, Amsterdam, Netherlands. [van den Besselaar, Peter] Vrije Univ Amsterdam, Dept Org Sci, Amsterdam, Netherlands. [Sumikura, Koichi] GRIPS Natl Grad Inst Policy Studies, Minato Ku, Tokyo 106867, Japan. [Schoen, Antoine; Laurens, Patricia] Univ Paris Est, ESIEE LATTS IFRIS, F-93160 Noisy Le Grand, France. [Pardo, Daniel] Aix Marseille Univ, CNRS, LEST UMR 7317, F-13626 Aix En Provence 01, France. RP Gurney, T (reprint author), Rathenau Inst, Anna van Saksenlaan 51, NL-2593 HW The Hague, Netherlands. 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Informetr. PD JAN PY 2014 VL 8 IS 1 BP 259 EP 272 DI 10.1016/j.joi.2013.12.007 PG 14 WC Information Science & Library Science SC Information Science & Library Science GA AB4PH UT WOS:000331771900024 ER PT J AU Huang, MH Huang, WT Chen, DZ AF Huang, Mu-Hsuan Huang, Wei-Tzu Chen, Dar-Zen TI Technological impact factor: An indicator to measure the impact of academic publications on practical innovation SO JOURNAL OF INFORMETRICS LA English DT Article DE Technological impact fact; Patent reference; Journal impact factor ID SCIENCE-AND-TECHNOLOGY; CITATION INDEXES; PATENT CITATIONS; RESEARCH OUTPUT; LINKAGE; DOCUMENTATION; KNOWLEDGE; QUALITY; METRICS; TIME AB This study established a technological impact factor (TIF) derived from journal impact factor (JlF), which is proposed to evaluate journals from the aspect of practical innovation. This impact factor mainly examines the influence of journal articles on patents by calculating the number of patents cited to a journal divided by the number of articles published in that particular journal. The values of TIF for five-year (TIF5) and ten-year (TIF10) periods at the journal level and aggregated TIF values (TIFAGG-3 and TIFAGG-10) at the category level were provided and compared to the JIF. The results reveal that journals with higher TIF values showed varied performances in the JCR, while the top ten journals on JIF(5) showed consistent good performance in TIFs. Journals in three selected categories - Electrical & Electronic Engineering, Research & Experimental Medicine, and Organic Chemistry - showed that TIF5 and TIF10, values are not strongly correlated with JIF5. Thus, TIFs can provide a new indicator for evaluating journals from the aspect of practical innovation. (C) 2013 Elsevier Ltd. All rights reserved. C1 [Huang, Mu-Hsuan] Natl Taiwan Univ, Dept Lib & Informat Sci, Taipei 10617, Taiwan. [Huang, Wei-Tzu] Univ Michigan, Sch Informat, Ann Arbor, MI 48109 USA. [Chen, Dar-Zen] Natl Taiwan Univ, Dept Mech Engn, Taipei 10617, Taiwan. [Chen, Dar-Zen] Natl Taiwan Univ, Inst Ind Engn, Taipei 10617, Taiwan. RP Chen, DZ (reprint author), Natl Taiwan Univ, Dept Mech Engn, 1,Sec 4, Taipei 10617, Taiwan. 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Informetr. PD JAN PY 2014 VL 8 IS 1 BP 241 EP 251 DI 10.1016/j.joi.2013.12.004 PG 11 WC Information Science & Library Science SC Information Science & Library Science GA AB4PH UT WOS:000331771900022 ER PT J AU Kongo, T AF Kongo, Takumi TI An alternative axiomatization of the Hirsch index SO JOURNAL OF INFORMETRICS LA English DT Article DE h-Index; Axiomatization; Symmetry; Head-independence ID EGGHES G-INDEX AB We axiomatize the well-known Hirsch index (h-index), which evaluates researcher productivity and impact on a field, and formalize a new axiom called head-independence. Under head-independence, a decrease, to some extent, in the number of citations of "frequently cited papers" has no effect on the index. Together with symmetry and axiom D, head-independence uniquely characterizes the h-index on a certain domain of indices. Some relationships between our axiomatization and those in the literature are also investigated. (C) 2013 Elsevier Ltd. All rights reserved. C1 Fukuoka Univ, Fac Econ, Jonan Ku, Fukuoka 8140180, Japan. RP Kongo, T (reprint author), Fukuoka Univ, Fac Econ, Jonan Ku, 8-19-1 Nanakuma, Fukuoka 8140180, Japan. EM kongo@adm.fukuoka-u.ac.jp CR Egghe L, 2006, SCIENTOMETRICS, V69, P131, DOI 10.1007/s11192-006-0144-7 Egghe L., 2006, ISSI NEWSLETTER, P8 Hirsch JE, 2005, P NATL ACAD SCI USA, V102, P16569, DOI 10.1073/pnas.0507655102 Quesada A, 2010, SCIENTOMETRICS, V82, P413, DOI 10.1007/s11192-009-0026-x Quesada A, 2011, SCIENTOMETRICS, V87, P107, DOI 10.1007/s11192-010-0307-4 Quesada A, 2009, J INFORMETR, V3, P158, DOI 10.1016/j.joi.2009.01.002 Woeginger GJ, 2009, J AM SOC INF SCI TEC, V60, P1267, DOI 10.1002/asi.21061 Woeginger GJ, 2008, J INFORMETR, V2, P364, DOI 10.1016/j.joi.2008.05.002 NR 8 TC 1 Z9 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 1751-1577 EI 1875-5879 J9 J INFORMETR JI J. Informetr. PD JAN PY 2014 VL 8 IS 1 BP 252 EP 258 DI 10.1016/j.joi.2013.12.005 PG 7 WC Information Science & Library Science SC Information Science & Library Science GA AB4PH UT WOS:000331771900023 ER PT J AU Leydesdorff, L Bornmann, L Marx, W Milojevic, S AF Leydesdorff, Loet Bornmann, Lutz Marx, Werner Milojevic, Stasa TI Referenced Publication Years Spectroscopy applied to iMetrics: Scientometrics, Journal of Informetrics, and a relevant subset of JASIST SO JOURNAL OF INFORMETRICS LA English DT Article DE Cited references; Historiography; Citation classics; iMetrics ID CITATION ANALYSIS; SCIENTIFIC LITERATURE; MATHEMATICAL-THEORY; SCIENCE; COMMUNICATION; TIME; INDICATORS; COCITATION; EMERGENCE; NETWORKS AB We have developed a (freeware) routine for "Referenced Publication Years Spectroscopy" (RPYS) and apply this method to the historiography of "iMetrics," that is, the junction of the journals Scientometrics, Informetrics, and the relevant subset of JASIST (approx. 20%) that shapes the intellectual space for the development of information metrics (bibliometrics, scientometrics, informetrics, and webometrics). The application to information metrics (our own field of research) provides us with the opportunity to validate this methodology, and to add a reflection about using citations for the historical reconstruction. The results show that the field is rooted in individual contributions of the 1920s to 1950s (e.g., Alfred J. Lotka), and was then shaped intellectually in the early 1960s by a confluence of the history of science (Derek de Solla Price), documentation (e.g., Michael M. Kessler's "bibliographic coupling"), and "citation indexing" (Eugene Garfield). Institutional development at the interfaces between science studies and information science has been reinforced by the new journal Inforrnetrics since 2007. In a concluding reflection, we return to the question of how the historiography of science using algorithmic means in terms of citation practices can be different from an intellectual history of the field based, for example, on reading source materials. (C) 2013 Elsevier Ltd. 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Based on 2002-2011 data for Flanders, Belgium, we demonstrate how the geographic center of weight of book publishing is different for the Social Sciences than for the Humanities. Whereas the latter still rely predominantly on domestic Flemish and continental European publishers, the former are firmly Anglo-Saxon oriented. The Humanities, however, show a more pronounced evolution toward further internationalization. For the already largely internationally oriented Social Sciences, in most recent years, the share of British publishers has grown. The barycenter method proves to be a valuable tool in the representation of research internationalization of book publications. This is especially the case when applied non-Anglophone countries. (C) 2013 Elsevier Ltd. All rights reserved. C1 [Verleysen, Frederik T.; Engels, Tim C. E.] Univ Antwerp, Ctr Res & Dev Monitoring ECOOM, B-2020 Antwerp, Belgium. [Engels, Tim C. E.] Univ Antwerp, Dept Res Affairs, B-2020 Antwerp, Belgium. [Engels, Tim C. 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T., 2014, USE ABUSE BIBLIOMETR Wang M., 2013, 14 INT SOC INF SCI C, P1857 NR 25 TC 1 Z9 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 1751-1577 EI 1875-5879 J9 J INFORMETR JI J. Informetr. PD JAN PY 2014 VL 8 IS 1 BP 234 EP 240 DI 10.1016/j.joi.2013.11.008 PG 7 WC Information Science & Library Science SC Information Science & Library Science GA AB4PH UT WOS:000331771900021 ER PT J AU Yu, T Yu, G Wang, MY AF Yu, Tian Yu, Guang Wang, Ming-Yang TI Classification method for detecting coercive self-citation in journals SO JOURNAL OF INFORMETRICS LA English DT Article DE Scientific journal; Coercive self-citation; Classification ID IMPACT FACTOR AB Journal self-citations strongly affect journal evaluation indicators (such as impact factors) at the mesa- and micro-levels, and therefore they are often increased artificially to inflate the evaluation indicators in journal evaluation systems. This coercive self-citation is a form of scientific misconduct that severely undermines the objective authenticity of these indicators. In this study, we developed the feature space for describing journal citation behavior and conducted feature selection by combining GA-Wrapper with RelifF. We also constructed a journal classification model using the logistic regression method to identify normal and abnormal journals. We evaluated the performance of the classification model using journals in three subject areas (BIOLOGY, MATHEMATICS and CHEMISTRY, APPLIED) during 2002-2011 as the test samples and good results were achieved in our experiments. Thus, we developed an effective method for the accurate identification of coercive self-citations. (C) 2013 Elsevier Ltd. All rights reserved. C1 [Yu, Tian; Yu, Guang] Harbin Inst Technol, Sch Management, Harbin 150001, Peoples R China. [Wang, Ming-Yang] Northeast Forestry Univ, Coll Informat & Comp Engn, Harbin 150040, Peoples R China. 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PD JAN PY 2014 VL 8 IS 1 BP 123 EP 135 DI 10.1016/j.joi.2013.11.001 PG 13 WC Information Science & Library Science SC Information Science & Library Science GA AB4PH UT WOS:000331771900012 ER PT J AU Burrell, QL AF Burrell, Quentin L. TI A stochastic approach to the relation between the impact factor and the uncitedness factor SO JOURNAL OF INFORMETRICS LA English DT Article DE Impact factor; Uncitedness factor; Gamma-Poisson process; Success-breeds-success; van Leeuwen-Moed lower bound ID LIBRARY CIRCULATION MODEL; CITATION DISTRIBUTION; H-INDEX AB Empirical analysis of the relationship between the impact factor - as measured by the average number of citations - and the proportion of uncited material in a collection dates back at least to van Leeuwen and Moed (2005) where graphical presentations revealed striking patterns. Recently Hsu and Huang (2012) have proposed a simple functional relationship. 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Thompson, Brian TI Socializing the h-index SO JOURNAL OF INFORMETRICS LA English DT Article DE h-Index; Social impact AB A variety of bibliometric measures have been proposed to quantify the impact of researchers and their work The h-index is a notable and widely used example which aims to improve over simple metrics such as raw counts of papers or citations. However, a limitation of this measure is that it considers authors in isolation and does not account for contributions through a collaborative team. To address this, we propose a natural variant that we dub the Social h-index. The idea is to redistribute the h-index score to reflect an individual's impact on the research community. In addition to describing this new measure, we provide examples, discuss its properties, and contrast with other measures. (C) 2013 Elsevier Ltd. All rights reserved. C1 [Cormode, Graham] Univ Warwick, Dept Comp Sci, Coventry CV4 7AL, W Midlands, England. [Ma, Qiang; Muthukrishnan, S.; Thompson, Brian] Rutgers State Univ, Dept Comp Sci, Piscataway, NJ 08855 USA. RP Cormode, G (reprint author), Univ Warwick, Dept Comp Sci, Coventry CV4 7AL, W Midlands, England. EM graham@dimacs.rutgers.edu CR Abbasi A, 2010, SCIENTOMETRICS, V83, P1, DOI 10.1007/s11192-009-0139-2 Egghe L, 2006, SCIENTOMETRICS, V69, P131, DOI 10.1007/s11192-006-0144-7 Hirsch JE, 2005, P NATL ACAD SCI USA, V102, P16569, DOI 10.1073/pnas.0507655102 Kameshwaran S, 2010, P ACM INT C INF KNOW, P229, DOI 10.1145/1871437.1871470 Rousseau R., 2005, J AM SOC INFORM SCI, V60, P410 Rousseau R., 2006, IND SCI TECHNOLOGY, V1, P23 NR 6 TC 1 Z9 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 1751-1577 J9 J INFORMETR JI J. Informetr. PY 2013 VL 7 IS 3 BP 718 EP 721 DI 10.1016/j.joi.2013.05.001 PG 4 WC Information Science & Library Science SC Information Science & Library Science GA 210UH UT WOS:000323859700016 ER PT J AU Hu, ZG Chen, CM Liu, ZY AF Hu, Zhigang Chen, Chaomei Liu, Zeyuan TI Where are citations located in the body of scientific articles? A study of the distributions of citation locations SO JOURNAL OF INFORMETRICS LA English DT Article DE Distribution of citations; Citation location; Structure of scientific articles; Full text analysis ID BIOMEDICAL ARTICLES; CITER MOTIVATIONS; INDEX; CLASSIFICATION; CONTEXTS; MODEL AB We address issues concerning what one may learn from how citation instances are distributed in scientific articles. We visualize and analyze patterns of citation distributions in the full text of 350 articles published in the Journal of Informetrics. In particular, we visualize and analyze the distributions of citations in articles that are organized in a commonly seen four-section structure, namely, introduction, method, results, and conclusions (IMRC). We examine the locations of citations to the groundbreaking h-index paper by Hirsch in 2005 and how patterns associated with citation locations evolve over time. The results show that citations are highly concentrated in the first section of an article. The density of citations in the first section is about three times higher than that in subsequent sections. The distributions of citations to highly cited papers are even more uneven. (C) 2013 Elsevier Ltd. All rights reserved. C1 [Hu, Zhigang; Chen, Chaomei; Liu, Zeyuan] Dalian Univ Technol, Joint Inst Study Knowledge Visualizat & Sci Disco, Dalian, Peoples R China. [Hu, Zhigang; Chen, Chaomei; Liu, Zeyuan] Drexel Univ, Joint Inst Study Knowledge Visualizat & Sci Disco, Philadelphia, PA USA. 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PY 2013 VL 7 IS 4 BP 887 EP 896 DI 10.1016/j.joi.2013.08.005 PG 10 WC Information Science & Library Science SC Information Science & Library Science GA 264ZV UT WOS:000327920400013 ER PT J AU Ko, YM Park, JY AF Ko, Young Man Park, Ji Young TI An index for evaluating journals in a small domestic citation index database whose citation rate is generally very low: A test based on the Korea Citation Index (KCI) database SO JOURNAL OF INFORMETRICS LA English DT Article DE S-index; Tapered h-index; Journal indicator; Differentiating power; Korea Citation Index; Korean journal ID H-INDEX AB This study describes the meaning of and the formula for S-index, which is a novel evaluation index based on the number of citations of each article in a particular journal and the rank of the article according to the number of citations. This study compares S-index with Impact Factor (IF), which is the most well-known evaluation index, using the Korea Citation Index data. It is shown that S-index is positively correlated with the number of articles published in a journal. Tapered h-index (h(T)-index), which is based on all articles of a journal like S-index, is compared with S-index. It is shown that there is a very strong positive correlation between S-index and h(T)-index. Although S-index is similar to h(T-)index, S-index has a slightly better differentiating power and ranks the journal with evenly cited articles higher. (c) 2013 Elsevier Ltd. All rights reserved. C1 [Ko, Young Man] Sungkyunkwan Univ, Dept Lib & Informat Sci, Seoul 110745, South Korea. [Park, Ji Young] Sungkyunkwan Univ, Inst Knowledge & Informat Management, Seoul 110745, South Korea. RP Ko, YM (reprint author), Sungkyunkwan Univ, Dept Lib & Informat Sci, 25-2 Sungkyunkwan Ro, Seoul 110745, South Korea. EM ymko@skku.edu CR Alonso S, 2010, SCIENTOMETRICS, V82, P391, DOI 10.1007/s11192-009-0047-5 Anderson TR, 2008, SCIENTOMETRICS, V76, P577, DOI 10.1007/s11192-007-2071-2 Braun T, 2006, SCIENTOMETRICS, V69, P169, DOI 10.1007/s11192-006-0147-4 Cabrerizo FJ, 2010, J INFORMETR, V4, P23, DOI 10.1016/j.joi.2009.06.005 Harter SP, 1998, J AM SOC INFORM SCI, V49, P507, DOI 10.1002/(SICI)1097-4571(19980501)49:6<507::AID-ASI3>3.0.CO;2-X Jin B., 2006, SCI FOCUS, V1, P8 Jin B., 2007, ISSI NEWSLETTER, V3, P6 Jin BH, 2007, CHINESE SCI BULL, V52, P855, DOI 10.1007/s11434-007-0145-9 Ko Y. M., 2012, POLICY RES SERIES 20 Ko YM, 2011, SCIENTOMETRICS, V88, P61, DOI 10.1007/s11192-011-0384-z Tol RSJ, 2009, SCIENTOMETRICS, V80, P317, DOI 10.1007/s11192-008-2079-7 NR 11 TC 1 Z9 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 1751-1577 J9 J INFORMETR JI J. Informetr. PY 2013 VL 7 IS 2 BP 404 EP 411 DI 10.1016/j.joi.2013.01.002 PG 8 WC Information Science & Library Science SC Information Science & Library Science GA 136PY UT WOS:000318377100018 ER PT J AU Magnone, E AF Magnone, Edoardo TI A scientometric look at calendar events SO JOURNAL OF INFORMETRICS LA English DT Article DE Time series; ScienceDirect (R); Calendar Publication regularity; High resolution analysis ID LUNAR CYCLES; TEMPERATURE; IMPACTS AB Using an application of scientometric methodology to the analysis of scientific communication, relationships between number of submissions of scientific articles and calendar events (e.g., festive seasons, weekend vacations, national public holidays, Chinese New Year, Christmas) are examined quantitatively. With regard to the aim of understanding the complexities of these relationships, the time series include weekly, monthly, and seasonal variations on the basis of Received Date as reported on the Article History of the Elsevier paper format. Data records are collected during twenty-year ( 1990-2010) and one-year periods - as case study - ended 31 December 2008. The analysis shows that the overall submission rates are strongly influenced by calendar events. (C) 2012 Elsevier Ltd. All rights reserved. C1 Korea Inst Energy Res, High Efficiency & Clean Energy Res Div, Taejon 305343, South Korea. RP Magnone, E (reprint author), Korea Inst Energy Res, High Efficiency & Clean Energy Res Div, 152 Gajeong Ro, Taejon 305343, South Korea. 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PD JAN PY 2013 VL 7 IS 1 BP 101 EP 108 DI 10.1016/j.joi.2012.09.006 PG 8 WC Information Science & Library Science SC Information Science & Library Science GA 065BG UT WOS:000313121300013 ER PT J AU Mannella, R Rossi, P AF Mannella, Riccardo Rossi, Paolo TI On the time dependence of the h-index SO JOURNAL OF INFORMETRICS LA English DT Article DE h-index; Time dependence; Time scaled h-index; Contemporary h-index AB The time dependence of the h-index is analyzed by considering the average behavior of h as a function of the academic age AA for about 1400 Italian physicists, with career lengths spanning from 3 to 46 years. The individual h-index is strongly correlated with the square root of the total citations Nc: h approximate to 0.53 NC. For academic ages ranging from 12 to 24 years, the distribution of the time scaled index h/ sic AA is approximately time-independent and it is well described by the Gompertz function. The time scaled index h/ sic AA has an average approximately equal to 3.8 and a standard deviation approximately equal to 1.6. Finally, the time scaled index h/ sic AA appears to be strongly correlated with the contemporary h-index hc. (C) 2012 Elsevier Ltd. All rights reserved. C1 [Mannella, Riccardo; Rossi, Paolo] Univ Pisa, Dipartimento Fis Enrico Fermi, I-56127 Pisa, Italy. RP Rossi, P (reprint author), Univ Pisa, Dipartimento Fis Enrico Fermi, I-56127 Pisa, Italy. EM mannella@df.unipi.it; rossi@df.unipi.it CR Egghe L, 2010, ANNU REV INFORM SCI, V44, P65 Hirsch JE, 2005, P NATL ACAD SCI USA, V102, P16569, DOI 10.1073/pnas.0507655102 Nielsen M., 2008, WHY H INDEX IS LITTL Petersen AM, 2010, PHYS REV E, V81, DOI 10.1103/PhysRevE.81.036114 Radicchi F, 2009, PHYS REV E, V80, DOI 10.1103/PhysRevE.80.056103 Rousseau R., 2005, J AM SOC INFORM SCI, V60, P410 Sidiropoulos A., 2006, SCIENTOMETRICS, V2, P253 Wu J, 2011, J INFORMETR, V5, P489, DOI 10.1016/j.joi.2011.02.003 NR 8 TC 1 Z9 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 1751-1577 J9 J INFORMETR JI J. Informetr. PD JAN PY 2013 VL 7 IS 1 BP 176 EP 182 DI 10.1016/j.joi.2012.10.003 PG 7 WC Information Science & Library Science SC Information Science & Library Science GA 065BG UT WOS:000313121300021 ER PT J AU McCarty, C Jawitz, JW AF McCarty, Christopher Jawitz, James W. TI Attitudes about publishing and normal science advancement SO JOURNAL OF INFORMETRICS LA English DT Article DE Credit assignment; Multi-authorship; H-index; Survey ID H-INDEX; COLLABORATION; PATTERNS; PRODUCTIVITY; ARTICLES; PARADIGM; CITATION; IMPACT AB The objective of this work was to examine the relationship between attitudes about publishing across disciplines and the scientific impact of authors. We conducted a web survey of 1066 authors randomly selected from four disciplines in the Web of Knowledge: economics, anthropology, water resources and biochemistry (approximately 250 from each discipline). Authors were asked questions about publishing norms within their discipline. The h-index of authors was subsequently calculated from data available from the Web of Knowledge. Authors in biochemistry had on average twice the h-index of those in economics, anthropology and water resources. Biochemists had higher expectations about the number of articles published for hire and promotion, more strongly valued interdisciplinary publishing, felt the cutting edge of their science was clearer, and had more defined patterns of author credit assignment than the other disciplines. Anthropologists exhibited a lower relationship between h-index and the number of years since their first publication. We conclude that attitudinal differences between disciplines may lead to differences in the recognition of scientific findings and the therefore the establishment of normal science. (C) 2013 Elsevier Ltd. All rights reserved. C1 [McCarty, Christopher] Univ Florida, Bur Econ & Business Res, Gainesville, FL 32610 USA. [Jawitz, James W.] Univ Florida, Soil & Water Sci Dept, Gainesville, FL USA. RP McCarty, C (reprint author), Univ Florida, Bur Econ & Business Res, Gainesville, FL 32610 USA. 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Succi, Sauro TI The Z-index: A geometric representation of productivity and impact which accounts for information in the entire rank-citation profile SO JOURNAL OF INFORMETRICS LA English DT Article DE Science of science; Citation impact; Rank stability; h-Index ID H-INDEX; DISTRIBUTIONS; UNIVERSALITY; INDICATORS; SCIENTISTS; CAREER AB We present a simple generalization of Hirsch's h-index, Z = root h(2) + C/root 5, where C is the total number of citations. Z is aimed at correcting the potentially excessive penalty made by h on a scientist's highly cited papers, because for the majority of scientists analyzed, we find the excess citation fraction (C - h(2))/C to be distributed closely around the value 0.75, meaning that 75% of the author's impact is neglected. Additionally, Z is less sensitive to local changes in a scientist's citation profile, namely perturbations which increase h while only marginally affecting C. Using real career data for 476 physicists careers and 488 biologist careers, we analyze both the distribution of Z and the rank stability of Z with respect to the Hirsch index h and the Egghe index g. We analyze careers distributed across a wide range of total impact, including top-cited physicists and biologists for benchmark comparison. In practice, the Z-index requires the same information needed to calculate h and could be effortlessly incorporated within career profile databases, such as Google Scholar and ResearcherID. Because Z incorporates information from the entire publication profile while being more robust than h and g to local perturbations, we argue that Z is better suited for ranking comparisons in academic decision-making scenarios comprising a large number of scientists. (C) 2013 Elsevier Ltd. All rights reserved. C1 [Petersen, Alexander M.] IMT Lucca Inst Adv Studies, I-55100 Lucca, Italy. [Succi, Sauro] Ist Applicaz Calcolo CNR, Rome, Italy. [Succi, Sauro] Freiburg Inst Adv Studies, D-79104 Freiburg, Germany. RP Petersen, AM (reprint author), IMT Lucca Inst Adv Studies, I-55100 Lucca, Italy. 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Informetr. PY 2013 VL 7 IS 4 BP 823 EP 832 DI 10.1016/j.joi.2013.07.003 PG 10 WC Information Science & Library Science SC Information Science & Library Science GA 264ZV UT WOS:000327920400007 ER PT J AU Schreiber, M AF Schreiber, Michael TI How to derive an advantage from the arbitrariness of the g-index SO JOURNAL OF INFORMETRICS LA English DT Article DE g-index; Generalized g-index; h-index; Citation analysis; Evaluation ID PHYSICISTS; CITATIONS AB The definition of the g-index is as arbitrary as that of the h-index, because the threshold number g(2) of citations to the g most cited papers can be modified by a prefactor at one's discretion, thus taking into account more or less of the highly cited publications within a dataset. In a case study I investigate the citation records of 26 physicists and show that the prefactor influences the ranking in terms of the generalized g-index less than for the generalized h-index. I propose specifically a prefactor of 2 for the g-index, because then the resulting values are of the same order of magnitude as for the common h-index. In this way one can avoid the disadvantage of the original g-index, namely that the values are usually substantially larger than for the h-index and thus the precision problem is substantially larger; while the advantages of the g-index over the h-index are kept. Like for the generalized h-index, also for the generalized g-index different prefactors might be more useful for investigations which concentrate only on top scientists with high citation frequencies or on junior researchers with small numbers of citations. (c) 2013 Elsevier Ltd. All rights reserved. C1 Tech Univ Chemnitz, Inst Phys, D-09107 Chemnitz, Germany. RP Schreiber, M (reprint author), Tech Univ Chemnitz, Inst Phys, D-09107 Chemnitz, Germany. 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PY 2013 VL 7 IS 2 BP 555 EP 561 DI 10.1016/j.joi.2013.02.003 PG 7 WC Information Science & Library Science SC Information Science & Library Science GA 136PY UT WOS:000318377100032 ER PT J AU Serenko, A Bontis, N AF Serenko, Alexander Bontis, Nick TI First in, best dressed: The presence of order-effect bias in journal ranking surveys SO JOURNAL OF INFORMETRICS LA English DT Article DE Order-effect bias; Response-order effect; Journal ranking; Survey ID MANAGEMENT; IMPACT; PERCEPTIONS; DISCOURSE; SCHOLARS; QUALITY; FORUMS AB The purpose of this study is to test for the presence of order-effect bias in journal ranking surveys. Data were obtained from 379 active knowledge management and intellectual capital researchers who rated 25 journals on a 7-point scale. Five different versions of the survey instrument were utilized. Consistent with the cognitive elaboration model, the satisficing theory, and the Gricean maxim of orderliness, order-effect bias was observed in journal ranking surveys. Journals that appear in the beginning of the ranking list delivered to survey respondents consistently receive higher scores than journals at the end of the list. Overall, the position of the journal in the list explains over 10% of its score. Therefore, authors of journal ranking studies are recommended to use multiple versions of the survey instrument with randomized journal orders. (C) 2012 Elsevier Ltd. All rights reserved. C1 [Serenko, Alexander] Lakehead Univ, Fac Business Adm, Thunder Bay, ON P7B 5E1, Canada. [Bontis, Nick] McMaster Univ, DeGroote Sch Business, Hamilton, ON L8S 4M4, Canada. RP Serenko, A (reprint author), Lakehead Univ, Fac Business Adm, 955 Oliver Rd, Thunder Bay, ON P7B 5E1, Canada. 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PD JAN PY 2013 VL 7 IS 1 BP 138 EP 144 DI 10.1016/j.joi.2012.10.005 PG 7 WC Information Science & Library Science SC Information Science & Library Science GA 065BG UT WOS:000313121300017 ER PT J AU Vinkler, P AF Vinkler, Peter TI Comparative rank assessment of journal articles SO JOURNAL OF INFORMETRICS LA English DT Article DE Elite set; Evaluation; Percentage Rank Position; Rank by citation rate; Normalization by field; Normalization by size ID SCIENTIFIC IMPACT; CITATION IMPACT; INDEX; INDICATOR; NORMALIZATION; PUBLICATIONS; PERFORMANCE AB To take into account the impact of the different bibliometric features of scientific fields and different size of both the publication set evaluated and the set used as reference standard, two new impact indicators are introduced. The Percentage Rank Position (PRP) indicator relates the ordinal rank position of the article assessed to the total number of papers in the publishing journal. 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PD OCT PY 2012 VL 6 IS 4 BP 485 EP 495 DI 10.1016/j.joi.2012.03.006 PG 11 WC Information Science & Library Science SC Information Science & Library Science GA 003AY UT WOS:000308581700005 ER PT J AU Abramo, G Cicero, T D'Angelo, CA AF Abramo, Giovanni Cicero, Tindaro D'Angelo, Ciriaco Andrea TI A sensitivity analysis of research institutions' productivity rankings to the time of citation observation SO JOURNAL OF INFORMETRICS LA English DT Article DE Research evaluation; Bibliometrics; Citation window; Productivity; Universities; Rankings AB One of the critical issues in bibliometric research assessments is the time required to achieve maturity in citations. Citation counts can be considered a reliable proxy of the real impact of a work only if they are observed after sufficient time has passed from publication date. In the present work the authors investigate the effect of varying the time of citation observation on accuracy of productivity rankings for research institutions. Research productivity measures are calculated for all Italian universities active in the hard sciences in the 2001-2003 period, by individual field and discipline, with the time of the citation observation varying from 2004 to 2008. The objective is to support policy-makers in choosing a citation window that optimizes the tradeoff between accuracy of rankings and timeliness of the exercise. (C) 2011 Elsevier Ltd. All rights reserved. C1 [Abramo, Giovanni; Cicero, Tindaro; D'Angelo, Ciriaco Andrea] Univ Roma Tor Vergata, Dept Management, Sch Engn, Lab Studies Res & Technol Transfer, Rome, Italy. [Abramo, Giovanni] CNR, IASI, Inst Syst Anal & Comp Sci, I-00185 Rome, Italy. RP Abramo, G (reprint author), Univ Roma Tor Vergata, Dipartimento Ingn Impresa, Via Politecn 1, I-00133 Rome, Italy. 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N., 2001, SCIENTOMETRICS, V51, P35 VQR, 2011, LIN GUID VQR 2004 20 NR 15 TC 1 Z9 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 1751-1577 J9 J INFORMETR JI J. Informetr. PD APR PY 2012 VL 6 IS 2 BP 298 EP 306 DI 10.1016/j.joi.2011.11.005 PG 9 WC Information Science & Library Science SC Information Science & Library Science GA 906RF UT WOS:000301364100014 ER PT J AU Roth, C Wu, J Lozano, S AF Roth, Camille Wu, Jiang Lozano, Sergi TI Assessing impact and quality from local dynamics of citation networks SO JOURNAL OF INFORMETRICS LA English DT Article DE Citation networks; Bibliometrics; Qualitative assessment; Citation dynamics ID SLEEPING BEAUTIES; DISTRIBUTIONS; PERFORMANCE; SCIENCE AB We show that essentially local dynamics of citation networks bring special information about the relevance/quality of a paper. Up to some rescaling, they exhibit universal behavior in citation dynamics: temporal patterns are remarkably consistent across disciplines, and uncover a prediction method for citations based on the structure of references only, at publication time. Above-average cited papers universally focus extensively on their own recent subfield - as such, citation counts essentially select what may plausibly be considered as the most disciplinary and normal science; whereas papers which have a peculiar dynamics, such as re-birthing scientific works - 'rediscovered classics' or 'early birds' - are comparatively poorly cited, despite their plausible relevance for the underlying communities. The "rebirth index" that we propose to quantify this phenomenon may be used as a complementary quality-defining criterion, in addition to final citation counts. (C) 2011 Elsevier Ltd. All rights reserved. C1 [Roth, Camille] CNRS EHESS, CAMS, Ctr Anal & Math Soci, CNRS, F-75013 Paris, France. [Wu, Jiang] ISC PIF, F-75005 Paris, France. [Wu, Jiang] Wuhan Univ, Sch Informat Management, Wuhan 430072, Peoples R China. [Wu, Jiang; Lozano, Sergi] ETH, Chair Sociol Particular Modeling & Simulat, CH-8092 Zurich, Switzerland. RP Roth, C (reprint author), CNRS EHESS, CAMS, Ctr Anal & Math Soci, CNRS, 190 Ave France, F-75013 Paris, France. 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Informetr. PD JAN PY 2012 VL 6 IS 1 BP 111 EP 120 DI 10.1016/j.joi.2011.08.005 PG 10 WC Information Science & Library Science SC Information Science & Library Science GA 865QL UT WOS:000298325300014 ER PT J AU Vanclay, JK AF Vanclay, Jerome K. TI What was wrong with Australia's journal ranking? SO JOURNAL OF INFORMETRICS LA English DT Letter C1 So Cross Univ, Lismore, NSW 2480, Australia. RP Vanclay, JK (reprint author), So Cross Univ, POB 157, Lismore, NSW 2480, Australia. EM JVanclay@scu.edu.au RI Vanclay, Jerome/B-9266-2009 OI Vanclay, Jerome/0000-0002-5639-5481 CR Butler L, 2011, J INFORMETR, V5, P693, DOI 10.1016/j.joi.2011.04.001 Haddow G., 2011, AUSTR U REV, V53, P88 Martin B., 2011, AUSTR U REV, V53, P99 Vanclay JK, 2011, J INFORMETR, V5, P265, DOI 10.1016/j.joi.2010.12.001 Vanclay JK, 2008, J INFORMETR, V2, P326, DOI 10.1016/j.joi.2008.07.002 Young S., 2011, AUSTR U REV, V53, P77 NR 6 TC 1 Z9 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 1751-1577 J9 J INFORMETR JI J. Informetr. PD JAN PY 2012 VL 6 IS 1 BP 53 EP 54 DI 10.1016/j.joi.2011.09.007 PG 2 WC Information Science & Library Science SC Information Science & Library Science GA 865QL UT WOS:000298325300008 ER PT J AU Bornmann, L Plume, A AF Bornmann, Lutz Plume, Andrew TI Is it necessary to consider suburbs (or small cities in the close proximity) and name variants in a citation impact analysis for bigger cities? An investigation using Munich as an example SO JOURNAL OF INFORMETRICS LA English DT Letter C1 [Bornmann, Lutz] Max Planck Soc, D-80539 Munich, Germany. [Plume, Andrew] Elsevier, Oxford OX5 1GB, England. RP Bornmann, L (reprint author), Max Planck Soc, Hofgartenstr 8, D-80539 Munich, Germany. EM bornmann@gv.mpg.de RI Bornmann, Lutz/A-3926-2008 OI Bornmann, Lutz/0000-0003-0810-7091 CR Frenken K, 2009, J INFORMETR, V3, P222, DOI 10.1016/j.joi.2009.03.005 Matthiessen CW, 2010, URBAN STUD, V47, P1879, DOI 10.1177/0042098010372683 Van Noorden Richard, 2010, Nature, V467, P906, DOI 10.1038/467906a NR 3 TC 1 Z9 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 1751-1577 J9 J INFORMETR JI J. Informetr. PD OCT PY 2011 VL 5 IS 4 BP 695 EP 697 DI 10.1016/j.joi.2011.05.002 PG 3 WC Information Science & Library Science SC Information Science & Library Science GA 841PI UT WOS:000296524200020 ER PT J AU de la Pena, JA AF de la Pena, Jose A. TI Impact functions on the citation network of scientific articles SO JOURNAL OF INFORMETRICS LA English DT Article DE Network of citations; Impact of papers; Eigenvalues of matrices associated to networks; Perron eigenvalue ID SCIENCE; PHYSICS AB Scientometric models, which consider papers in a undifferentiated way, are blind to important features of the citation network. We propose an approach for the definition of a function P-S, for any set of scientific articles S, which reflects global properties of the citation network associated to S. Such a function, that we propose as a measure of the impact of scientific papers, is constructed as solution of an iterated system of Perron-eigenvalue problems. We discuss differences with previously defined measures, in particular of the PageRank type. (C) 2011 Elsevier Ltd. All rights reserved. C1 [de la Pena, Jose A.] Univ Nacl Autonoma Mexico, Inst Matemat, Mexico City 04510, DF, Mexico. [de la Pena, Jose A.] CIMAT, Ctr Invest Matemat, Guanajuato, Mexico. RP de la Pena, JA (reprint author), Univ Nacl Autonoma Mexico, Inst Matemat, Mexico City 04510, DF, Mexico. EM jap@matem.unam.mx CR Adler R., 2008, CITATION STAT JOINT Altman A., 2005, P 6 ACM C EL COMM EC Chen P, 2007, J INFORMETR, V1, P8, DOI 10.1016/j.joi.2006.06.001 Cvetkovic D.M., 1982, SPECTRA GRAPHS THEOR Gantmacher F., 1959, THEORY MATRICES, VI Gantmacher F., 1959, THEORY MATRICES, V2 GARFIELD E, 1995, SCIENCE, V12, P108 Garfield E, 1998, UNFALLCHIRURG, V101, P413 GARFIELD E, 1976, ESSAYS INFORM SCI CU, V6, P419 GELLER NL, 1978, INFORM PROCESS MANAG, V14, P93, DOI 10.1016/0306-4573(78)90066-3 Godsil C., 2001, GRADUATE TEXTS MATH, V207 Granovsky YV, 2001, SCIENTOMETRICS, V52, P127, DOI 10.1023/A:1017991017982 Hirsch JE, 2005, P NATL ACAD SCI USA, V102, P16569, DOI 10.1073/pnas.0507655102 KESSLER MM, 1965, STAT ASSOC METHOD M, V1964, P193 Langville A. 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Maria Sarabia, Jose Kolev, Nikolai TI A simple relation between the Leimkuhler curve and the mean residual life SO JOURNAL OF INFORMETRICS LA English DT Article DE Lifetime; Pareto and lognormal distributions; Cumulative distribution function; Mean residual life function ID GENERAL DEFINITION; FAILURE RATE; H-INDEX; DISTRIBUTIONS; OBSOLESCENCE; MODEL AB In this paper, a simple relation between the Leimkuhler curve and the mean residual life is established. The result is illustrated with several models commonly used in informetrics, such as exponential, Pareto and lognormal. Finally, relationships with some other reliability concepts are also presented. (C) 2010 Elsevier Ltd. All rights reserved. C1 [Maria Sarabia, Jose] Univ Cantabria, Dept Econ, E-39005 Santander, Spain. [Balakrishnan, N.] McMaster Univ, Dept Math & Stat, Hamilton, ON L8S 4K1, Canada. [Kolev, Nikolai] Univ Sao Paulo, Dept Stat, BR-05508 Sao Paulo, Brazil. RP Sarabia, JM (reprint author), Univ Cantabria, Dept Econ, E-39005 Santander, Spain. 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Informetr. PD OCT PY 2010 VL 4 IS 4 BP 602 EP 607 DI 10.1016/j.joi.2010.06.009 PG 6 WC Information Science & Library Science SC Information Science & Library Science GA 647KA UT WOS:000281616200014 ER PT J AU Kosmulski, M AF Kosmulski, Marek TI Hirsch-type index of international recognition SO JOURNAL OF INFORMETRICS LA English DT Article DE Citation metrics; Research output AB The country-wise distribution of papers, which cite certain scientist is a sum of typical distribution for his/her branch of science and excessive citations from one or from a few countries. A new Hirsch-type index h_int is defined as the number of countries, h_int, from which at least h_int papers cite certain scientist, but from the country ranked h_int+1 in citing the scientist, less than h_int+1 papers cite that scientist. 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EM mkosmuls@abo.fi RI Kosmulski, Marek/F-2326-2010; Kosmulski, Marek/B-9158-2009 CR Aksnes DW, 2009, RES POLICY, V38, P895, DOI 10.1016/j.respol.2009.02.001 Braun T, 2006, INFORM PROCESS MANAG, V42, P1652, DOI 10.1016/j.ipm.2006.03.014 Della Sala S., 2008, CORTEX, V44, P1139 Engqvist L, 2008, TRENDS ECOL EVOL, V23, P250, DOI 10.1016/j.tree.2008.01.009 Hirsch JE, 2005, P NATL ACAD SCI USA, V102, P16569, DOI 10.1073/pnas.0507655102 King DA, 2004, NATURE, V430, P311, DOI 10.1038/430311a Kosmulski M, 2009, J INFORMETR, V3, P341, DOI 10.1016/j.joi.2009.05.003 Panaretos J, 2009, SCIENTOMETRICS, V81, P635, DOI 10.1007/s11192-008-2174-9 SCHREIBER M, 2007, 30002 EPL 78 Schreiber M, 2007, ANN PHYS-BERLIN, V16, P640, DOI 10.1002/andp.200710252 NR 10 TC 1 Z9 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 1751-1577 J9 J INFORMETR JI J. Informetr. PD JUL PY 2010 VL 4 IS 3 BP 351 EP 357 DI 10.1016/j.joi.2010.02.004 PG 7 WC Information Science & Library Science SC Information Science & Library Science GA 607YQ UT WOS:000278543600014 ER PT J AU Wang, SH Wang, HJ Weldon, PR AF Wang, Shuhua Wang, Hengjun Weldon, Paul R. TI Effect of cooperation between Chinese scientific journals and international publishers on journals' impact factor SO JOURNAL OF INFORMETRICS LA English DT Article DE Chinese scientific journals; International publishers; Impact factor ID LANGUAGE ACADEMIC JOURNALS AB Growing cooperation between Chinese journals and international publishers invites an investigation of the effect of this cooperation, based on an analysis of journal IF changes. Data from 23 Chinese academic journals were chosen from about 50 English-language academic journals indexed by SCI or SCIE and with a long history of cooperation. The data do not suggest that cooperation has improved the journals' IF thus far. It appears that cooperation is generally limited to international distribution, and this has a weak influence on the quality of the journal and its IF, even though the papers can be accessed by worldwide users through publishers' international distribution networks. Cooperation with international publishers is one step, but actively working on the quality of the journals is a more important step. (C) 2009 Elsevier Ltd. All rights reserved. C1 [Wang, Shuhua; Wang, Hengjun; Weldon, Paul R.] China Univ Geosci, Editorial Off Journal, Wuhan 430074, Peoples R China. RP Wang, SH (reprint author), China Univ Geosci, Editorial Off Journal, Wuhan 430074, Peoples R China. EM dr.shuhua@gmail.com; shhwang@cug.edu.cn; paul.weldon@gmail.com CR Althouse BM, 2009, J AM SOC INF SCI TEC, V60, P27, DOI 10.1002/asi.20936 Craig ID, 2007, J INFORMETR, V1, P239, DOI 10.1016/j.joi.2007.04.001 Li L, 2007, CELL SIGNAL, V19, P439, DOI 10.1016/j.cellsig.2006.08.018 LI Y, 2007, CHINESE J SCI TECHNI, V18, P474 McVeigh M. 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PD JUL PY 2010 VL 4 IS 3 BP 233 EP 238 DI 10.1016/j.joi.2009.11.008 PG 6 WC Information Science & Library Science SC Information Science & Library Science GA 607YQ UT WOS:000278543600003 ER PT J AU Liang, LM Rousseau, R AF Liang, Liming Rousseau, Ronald TI Measuring a journal's input rhythm based on its publication-reference matrix SO JOURNAL OF INFORMETRICS LA English DT Article; Proceedings Paper CT 1st Joint ASIS&T/ISS Conference Seminar 2009 CY NOV 07, 2009 CL Vancouver, CANADA DE Rhythm sequences; Publication-reference matrices; Relative reference factor ID RELATIVE INDICATORS; SCIENCE; SEQUENCES; FIELDS AB The difference among journal reference characteristics in various fields causes a field-based difference in their citation counts. For the purpose of improving indicators used in cross-field evaluations it is necessary to continue explorations corresponding to the characteristics of journal references. Such an exploration would offer new clues for solving the problem of cross-field journal evaluation. During the past years studies of the rhythm of science have obtained some achievements: constructing various types of publication-citation matrices (in short: p-c matrices), creating a series of rhythm indicators, studying the fundamental mathematical properties of rhythm sequences and exploring some journals' rhythm sequences. Rhythm indicators can be applied to many studies, if the system is a source-item system with two time dimensions, ensuring the construction of a p-c-like matrix, then such a study is theoretically feasible. In this article we create a journal's publication-reference matrix (p-r matrix). Based on the p-r matrix the rR' indicator is defined, which is used to measure the so-called input rhythm of a journal. As two case studies, the input rhythms of the Journal of the American Society for Information Science and Technology and of the Journal of Documentation are presented and analyzed. (C) 2009 Elsevier Ltd. All rights reserved. C1 [Liang, Liming] Henan Normal Univ, Inst Sci Technol & Soc, Xinxiang 453007, Peoples R China. [Liang, Liming] Dalian Univ Technol, Sch Humanities & Social Sci, Dalian 116024, Peoples R China. [Rousseau, Ronald] KHBO Assoc KU Leuven, B-8400 Oostende, Belgium. [Rousseau, Ronald] Hasselt Univ, B-3590 Diepenbeek, Belgium. [Rousseau, Ronald] Katholieke Univ Leuven, Dept Math, B-3001 Louvain, Belgium. RP Liang, LM (reprint author), Henan Normal Univ, Inst Sci Technol & Soc, 46 Jian She Rd, Xinxiang 453007, Peoples R China. 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Informetr. PD APR PY 2010 VL 4 IS 2 BP 201 EP 209 DI 10.1016/j.joi.2009.11.002 PG 9 WC Information Science & Library Science SC Information Science & Library Science GA 568II UT WOS:000275515500009 ER PT J AU McCain, KW AF McCain, Katherine W. TI Core journal literatures and persistent research themes in an emerging interdisciplinary field: Exploring the literature of evolutionary developmental biology SO JOURNAL OF INFORMETRICS LA English DT Article; Proceedings Paper CT 1st Joint ASIS&T/ISS Conference Seminar 2009 CY NOV 07, 2009 CL Vancouver, CANADA DE Citation analysis; Core journal network; Research theme; Evolutionary developmental biology; Interdisciplinarity ID EVO-DEVO; NETWORKS; GENE; DISCIPLINE; PHYLOGENY AB This paper reports two interrelated citation-based studies of the intellectual structure of Evolutionary Developmental Biology (Evo-Devo). The core journals of Evo-Devo (Evolution & Development, Development, Genes & Evolution, and Journal of Experimental Zoology, pt. B) and its supporting/parental disciplines are identified and their strong citation links mapped based on data from Journal Citation Reports, 2005-2007. Evo-Devo cites into Developmental Biology in all three years and exchanges citations with Paleontology in 2007. There are no strong connections with either general or molecular Evolution journals. Persistent, visible research themes are visualized as citing-cited networks and subnetworks of articles extracted from the Web of Science for the core Evo-Devo journals and a larger set of articles citing one or more Evo-Devo journals. Most research themes in the core set are specific to a single journal. Few highly cited core journal articles are also visible in the broader set of networks and subnetworks, although some themes (e. g., arthropod body plans, chordate genes/gene expression) are visible in both data sets. (C) 2009 Elsevier Ltd. All rights reserved. C1 Drexel Univ, Coll Informat Sci & Technol, Philadelphia, PA 19104 USA. 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Informetr. PD APR PY 2010 VL 4 IS 2 BP 157 EP 165 DI 10.1016/j.joi.2009.11.004 PG 9 WC Information Science & Library Science SC Information Science & Library Science GA 568II UT WOS:000275515500004 ER PT J AU Tonta, Y Darvish, HR AF Tonta, Yasar Darvish, Hamid R. TI Diffusion of latent semantic analysis as a research tool: A social network analysis approach SO JOURNAL OF INFORMETRICS LA English DT Article DE Latent semantic analysis; Social network analysis; Co-authorship analysis; Cluster analysis ID SCIENTIFIC COLLABORATION NETWORKS; KNOWLEDGE; PATTERNS; BETWEENNESS; CENTRALITY; SCIENCE; TRENDS AB Latent semantic analysis (LSA) is a relatively new research tool with a wide range of applications in different fields ranging from discourse analysis to cognitive science, from information retrieval to machine learning and so on. In this paper, we chart the development and diffusion of LSA as a research tool using social network analysis (SNA) approach that reveals the social structure of a discipline in terms of collaboration among scientists. Using Thomson Reuters' Web of Science (WoS), we identified 65 papers with "latent semantic analysis" in their titles and 250 papers in their topics (but not in titles) between 1990 and 2008. We then analyzed those papers using bibliometric and SNA techniques such as co-authorship and cluster analysis. It appears that as the emphasis moves from the research tool (LSA) itself to its applications in different fields, citations to papers with LSA in their titles tend to decrease. The productivity of authors fits Lotka's Law while the network of authors is quite loose. Networks of journals cited in papers with LSA in their titles and topics are well connected. (C) 2009 Elsevier Ltd. All rights reserved. C1 [Darvish, Hamid R.] Cankaya Univ, Fac Engn & Architecture, Dept Comp Engn, TR-06530 Ankara, Turkey. [Tonta, Yasar] Hacettepe Univ, Fac Letters, Dept Informat Management, TR-06800 Ankara, Turkey. RP Darvish, HR (reprint author), Cankaya Univ, Fac Engn & Architecture, Dept Comp Engn, TR-06530 Ankara, Turkey. 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PD APR PY 2010 VL 4 IS 2 BP 166 EP 174 DI 10.1016/j.joi.2009.11.003 PG 9 WC Information Science & Library Science SC Information Science & Library Science GA 568II UT WOS:000275515500005 ER PT J AU Inoue, H Souma, W Tamada, S AF Inoue, Hiroyasu Souma, Wataru Tamada, Schumpeter TI Analysis of cooperative research and development networks on Japanese patents SO JOURNAL OF INFORMETRICS LA English DT Article DE Network; Patent; Joint application AB To sustain economic growth, countries have to manage systems in order to create technological innovation. To meet this goal, they are developing policies that organically connect companies, national laboratories, and universities into innovation networks. However, the whole structures of these connections have been little investigated because of the difficulty of obtaining such data. We use Japanese patent data and create a network of jointly applying organizations. This network can be considered as one representation of an innovation network because patents are seeds of innovation and joint applications are strong evidence of connections between organizations. We investigated the structure of the network, especially whether or not the degree distribution follows a power law. After that, we also propose a model that generates the actual network, not only degree distribution, but also link distance distribution. (C) 2009 Elsevier Ltd. All rights reserved. C1 [Inoue, Hiroyasu] Osaka Sangyo Univ, Daito City, Osaka 5740013, Japan. [Souma, Wataru] Nihon Univ, Tokyo 1028275, Japan. [Tamada, Schumpeter] Kwansei Gakuin Univ, Nishinomiya, Hyogo 6628501, Japan. RP Inoue, H (reprint author), Osaka Sangyo Univ, 3-1-1 Nakagaito, Daito City, Osaka 5740013, Japan. 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Informetr. PD JAN PY 2010 VL 4 IS 1 BP 89 EP 96 DI 10.1016/j.joi.2009.09.002 PG 8 WC Information Science & Library Science SC Information Science & Library Science GA 530ZI UT WOS:000272631100010 ER PT J AU Agouzal, A Lafouge, T AF Agouzal, Abdelatif Lafouge, Thierry TI On the relation between the Maximum Entropy Principle and the principle of Least Effort: The continuous case SO JOURNAL OF INFORMETRICS LA English DT Article DE Maximum Entropy Principle; Principle of Least Effort; effort function; inverse power function AB The Maximum Entropy Principle (MEP) maximizes the entropy provided that the effort remains constant. The Principle of Least Effort (PLE) minimizes the effort provided that the entropy remains constant. The paper investigates the relation between these two principles. In some kinds of effort functions, called admissible, it is shown that these two principles are equivalent. The results are illustrated by the size-frequency statistical distribution met in infometry in Information Production Processes. (C) 2007 Elsevier Ltd. All rights reserved. C1 [Lafouge, Thierry] Univ Lyon 1, ELICO, F-69622 Villeurbanne, France. [Agouzal, Abdelatif; Lafouge, Thierry] Univ Lyon, Lyon, France. [Agouzal, Abdelatif] Univ Lyon 1, CNRS, UMR 5208, Inst Camille Jordan, F-69622 Villeurbanne, France. RP Lafouge, T (reprint author), Univ Lyon 1, ELICO, Batiment Omega,43 Blvd 11 Novembre 1918, F-69622 Villeurbanne, France. EM thierry.lafouge@univ-lyon1.fr CR Bradford S. 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TI Some comments on "The estimation of lost multi-copy documents: A new type of informetrics theory" by Egghe and Proot SO JOURNAL OF INFORMETRICS LA English DT Article DE multi-copy documents; truncated Poisson distribution; maximum likelihood; unseen species problem ID NUMBER; SAMPLE; POPULATION AB Egghe and Proot [Egghe, L., & Proot, G. (2007). The estimation of the number of lost multi-copy documents: A new type of informetrics theory. Journal of Informetrics] introduce a simple probabilistic model to estimate the number of lost multi-copy documents based on the numbers of retrieved ones. We show that their model in practice can essentially be described by the well-known Poisson approximation to the binomial. This enables us to adopt a traditional maximum likelihood estimation (MLE) approach which allows the construction of (approximate) confidence intervals for the parameters of interest, thereby resolving an open problem left by the authors. We further show that the general estimation problem is a variant of a well-known unseen species problem. This work should be viewed as supplementing that of Egghe and Proot [Egghe, L., & Proot, G. (2007). The estimation of the number of lost multi-copy documents: A new type of informetrics theory. Journal of Informetrics]. It turns out that their results are broadly in line with those produced by this rather more robust statistical analysis. (C) 2007 Elsevier Ltd. All rights reserved. C1 Isle Man Int Business Sch, Douglas IM2 1QB, Man, England. RP Burrell, QL (reprint author), Isle Man Int Business Sch, Old Castletown Rd, Douglas IM2 1QB, Man, England. EM q.burrell@ibs.ac.im CR Bain L. 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PY 2008 VL 2 IS 1 BP 101 EP 105 DI 10.1016/j.joi.2007.07.002 PG 5 WC Information Science & Library Science SC Information Science & Library Science GA 270LL UT WOS:000253722200006 ER PT J AU Egghe, L AF Egghe, Leo TI Welcome to the journal of informetrics SO JOURNAL OF INFORMETRICS LA English DT Editorial Material C1 Hasselt Univ, Lib Agoralaan, B-3590 Diepenbeek, Belgium. RP Egghe, L (reprint author), Hasselt Univ, Lib Agoralaan, Campus Diepenbeek, B-3590 Diepenbeek, Belgium. EM Leo.egghe@uhasselt.be CR Egghe L, 2006, INFORM PROCESS MANAG, V42, P1405, DOI 10.1016/j.ipm.2006.02.004 NR 1 TC 1 Z9 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 1751-1577 J9 J INFORMETR JI J. Informetr. PD JAN PY 2007 VL 1 IS 1 BP 1 EP 1 DI 10.1016/j.joi.2006.09.003 PG 1 WC Information Science & Library Science SC Information Science & Library Science GA 274AN UT WOS:000253974300001 ER PT J AU Bornmann, L Marx, W AF Bornmann, Lutz Marx, Werner TI Methods for the generation of normalized citation impact scores in bibliometrics: Which method best reflects the judgements of experts? SO JOURNAL OF INFORMETRICS LA English DT Article DE F1000; Bibliometrics; Citing-side indicator; Cited-side indicator; Normalized citation impact ID RANK APPROACH; ADJUSTED PREDICTIONS; INDICATOR; SCIENCE; P100; OUTPUT; F1000 AB Evaluative bibliometrics compare the citation impact of researchers, research groups and institutions with each other across time scales and disciplines. Both factors, discipline and period - have an influence on the citation count which is independent of the quality of the publication. Normalizing the citation impact of papers for these two factors started in the mid-1980s. Since then, a range of different methods have been presented for producing normalized citation impact scores. The current study uses a data set of over 50,000 records to test which of the methods so far presented correlate better with the assessment of papers by peers. The peer assessments come from F1000Prime - a post-publication peer review system of the biomedical literature. Of the normalized indicators, the current study involves not only cited-side indicators, such as the mean normalized citation score, but also citing-side indicators. As the results show, the correlations of the indicators with the peer assessments all turn out to be very similar. Since F1000 focuses on biomedicine, it is important that the results of this study are validated by other studies based on datasets from other disciplines or (ideally) based on multi-disciplinary datasets. (c) 2015 Elsevier Ltd. All rights reserved. C1 [Bornmann, Lutz] Max Planck Gesell, Adm Headquarters, Div Sci & Innovat Studies, D-80539 Munich, Germany. [Marx, Werner] Max Planck Inst Solid State Res, D-70569 Stuttgart, Germany. RP Bornmann, L (reprint author), Max Planck Gesell, Adm Headquarters, Div Sci & Innovat Studies, Hofgartenstr 8, D-80539 Munich, Germany. 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PD APR PY 2015 VL 9 IS 2 BP 408 EP 418 DI 10.1016/j.joi.2015.01.006 PG 11 WC Information Science & Library Science SC Information Science & Library Science GA CE2JA UT WOS:000351640700013 ER PT J AU Cena, A Gagolewski, M Mesiar, R AF Cena, Anna Gagolewski, Marek Mesiar, Radko TI Problems and challenges of information resources producers' clustering SO JOURNAL OF INFORMETRICS LA English DT Article DE Aggregation; Hierarchical clustering; Distance; Metric ID IMPACT ASSESSMENT; H-INDEX AB Classically, unsupervised machine learning techniques are applied on data sets with fixed number of attributes ( variables). However, many problems encountered in the field of informetrics face us with the need to extend these kinds of methods in a way such that they may be computed over a set of nonincreasingly ordered vectors of unequal lengths. Thus, in this paper, some new dissimilarity measures (metrics) are introduced and studied. Owing to that we may use, e.g. hierarchical clustering algorithms in order to determine an input data set's partition consisting of sets of producers that are homogeneous not only with respect to the quality of information resources, but also their quantity. (c) 2015 Elsevier Ltd. All rights reserved. C1 [Cena, Anna; Gagolewski, Marek] Polish Acad Sci, Syst Res Inst, PL-01447 Warsaw, Poland. [Gagolewski, Marek] Warsaw Univ Technol, Fac Math & Informat Sci, PL-00662 Warsaw, Poland. [Mesiar, Radko] Slovak Univ Technol Bratislava, Dept Math, Fac Civil Engn, Bratislava 81368, Slovakia. [Mesiar, Radko] Div Univ Ostrava IRAFM, Natl Supercomp Ctr IT4Innovat, Ostrava 70103 1, Czech Republic. RP Cena, A (reprint author), Polish Acad Sci, Syst Res Inst, Ul Newelska 6, PL-01447 Warsaw, Poland. EM cena@ibspan.waw.pl FU National Science Center, Poland [2014/13/D/HS4/01700]; European Union [UDA-POKL.04.01.01-00-051/10-00]; Research and Development for Innovations Operational Program - Structural Funds of Europe Union [CZ.1.05/1.1.00/02.0070]; [APVV-0073-10] FX The contribution of A, Cena and M. Gagolewski was partially supported by the National Science Center, Poland, research project 2014/13/D/HS4/01700.Anna Cena would like to acknowledge the support by the European Union from resources of the European Social Fund, Project PO IQ "Information technologies: Research and their interdisciplinary applications", agreement UDA-POKL.04.01.01-00-051/10-00 via the Interdisciplinary PhD Studies Program.The contribution of R. Mesiar has been done in connection with project APVV-0073-10 and also with IT4Innovations Center of Excellence, reg. no. CZ.1.05/1.1.00/02.0070 supported by Research and Development for Innovations Operational Program financed by Structural Funds of Europe Union and from the means of state budget of the Czech Republic. 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Informetr. PD APR PY 2015 VL 9 IS 2 BP 273 EP 284 DI 10.1016/j.joi.2015.02.005 PG 12 WC Information Science & Library Science SC Information Science & Library Science GA CE2JA UT WOS:000351640700004 ER PT J AU Dienes, KR AF Dienes, Keith R. TI Completing h SO JOURNAL OF INFORMETRICS LA English DT Article DE Citations; h-Index; Publications ID CITED-PUBLICATIONS INDICATOR; RANK-CITATION PROFILE; HIRSCH-INDEX; SCIENTIFIC IMPACT; DISTRIBUTIONS; COAUTHORS AB Nearly a decade ago, the science community was introduced to the h-index, a proposed statistical measure of the collective impact of the publications of any individual researcher. Of course, any method of reducing a complex data set to a single number will necessarily have certain limitations and introduce certain biases. However, in this paper we point out that the definition of the h-index actually suffers from something far deeper: a hidden mathematical incompleteness intrinsic to its definition. In particular, we point out that one critical step within the definition of h has been missed until now, resulting in an index which only achieves its stated objectives under certain rather limited circumstances. For example, this incompleteness explains why the h-index ultimately has more utility in certain scientific subfields than others. In this paper, we expose the origin of this incompleteness and then also propose a method of completing the definition of h in a way which remains close to its original guiding principle. As a result, our "completed" h not only reduces to the usual h in cases where the h-index already achieves its objectives, but also extends the validity of the h-index into situations where it currently does not. (c) 2015 Elsevier Ltd. All rights reserved. C1 Univ Arizona, Dept Phys, Tucson, AZ 85721 USA. RP Dienes, KR (reprint author), Univ Arizona, Dept Phys, Tucson, AZ 85721 USA. EM dienes@email.arizona.edu FU U.S. Department of Energy [DE-FG02-13ER-41976] FX The normal research activities of the author are funded in part under grant DE-FG02-13ER-41976 from the U.S. Department of Energy. The opinions and conclusions expressed herein do not represent those of any funding agency. Useful comments and encouragement from S. Redner, M. Sher, S. Su, B. Thomas, L. Waltman, and J. Wells are also herewith gratefully acknowledged. 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C., ARXIV12015476ASTROPH Tawfik A., ARXIV13060024CSDL van Eck NJ, 2008, J INFORMETR, V2, P263, DOI 10.1016/j.joi.2008.09.004 Waltman L, 2011, J AM SOC INFORM SCI, V63, P406 Woeginger GJ, 2008, MATH SOC SCI, V56, P224, DOI 10.1016/j.mathsocsci.2008.03.001 Woeginger GJ, 2008, J INFORMETR, V2, P298, DOI 10.1016/j.joi.2008.09.001 Wu Q, 2010, J AM SOC INF SCI TEC, V61, P609, DOI 10.1002/asi.21276 Zhang C. T., 2010, J AM SOC INF SCI TEC, V62, P625 Zyl J. M., 2013, GSTF J MATH STAT OPE, V2, P93 NR 48 TC 0 Z9 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 1751-1577 EI 1875-5879 J9 J INFORMETR JI J. Informetr. PD APR PY 2015 VL 9 IS 2 BP 385 EP 397 DI 10.1016/j.joi.2015.01.003 PG 13 WC Information Science & Library Science SC Information Science & Library Science GA CE2JA UT WOS:000351640700011 ER PT J AU Fiala, D Subelj, L Zitnik, S Bajec, M AF Fiala, Dalibor Subelj, Lovro Zitnik, Slavko Bajec, Marko TI Do PageRank-based author rankings outperform simple citation counts? SO JOURNAL OF INFORMETRICS LA English DT Article DE PageRank; Scholars; Citations; Rankings; Importance ID BIBLIOGRAPHIC NETWORKS; INDEX AB The basic indicators of a researcher's productivity and impact are still the number of publications and their citation counts. These metrics are clear, straightforward, and easy to obtain. When a ranking of scholars is needed, for instance in grant, award, or promotion procedures, their use is the fastest and cheapest way of prioritizing some scientists over others. However, due to their nature, there is a danger of oversimplifying scientific achievements. Therefore, many other indicators have been proposed including the usage of the PageRank algorithm known for the ranking of webpages and its modifications suited to citation networks. Nevertheless, this recursive method is computationally expensive and even if it has the advantage of favouring prestige over popularity, its application should be well justified, particularly when compared to the standard citation counts. In this study, we analyze three large datasets of computer science papers in the categories of artificial intelligence, software engineering, and theory and methods and apply 12 different ranking methods to the citation networks of authors. We compare the resulting rankings with selfcompiled lists of outstanding researchers selected as frequent editorial board members of prestigious journals in the field and conclude that there is no evidence of PageRank-based methods outperforming simple citation counts. (c) 2015 Elsevier Ltd. All rights reserved. C1 [Fiala, Dalibor] Univ W Bohemia, Dept Comp Sci & Engn, Plzen 30614, Czech Republic. [Subelj, Lovro; Zitnik, Slavko; Bajec, Marko] Univ Ljubljana, Fac Comp & Informat Sci, Ljubljana 1000, Slovenia. RP Fiala, D (reprint author), Univ W Bohemia, Dept Comp Sci & Engn, Univ 8, Plzen 30614, Czech Republic. EM dalfia@kiv.zcu.cz; lovro.subelj@fri.uni-lj.si; slavko.zitnik@fri.uni-lj.si; marko.bajec@fri.uni-lj.si RI Fiala, Dalibor/C-8690-2012 OI Fiala, Dalibor/0000-0002-2528-771X FU European Regional Development Fund (ERDF), project "NTIS - New Technologies for Information Society", European Centre of Excellence [CZ.1.05/1.1.00/02.0090]; Ministry of Education of the Czech Republic [MSMT MOBILITY 7AMB14SK090]; Slovenian Research Agency Program [P2-0359]; Slovenian Ministry of Education, Science and Sport Grant [430-168/2013/91]; European Union, European Social Fund FX Thanks are due to Thomson Reuters for providing us with the data. For D. Fiala, this work was supported by the European Regional Development Fund (ERDF), project "NTIS - New Technologies for Information Society", European Centre of Excellence, CZ.1.05/1.1.00/02.0090 and in part by the Ministry of Education of the Czech Republic under grant MSMT MOBILITY 7AMB14SK090. For L. Subelj, S. Zitnik, and M. Bajec, this work was supported in part by the Slovenian Research Agency Program No. P2-0359, by the Slovenian Ministry of Education, Science and Sport Grant No. 430-168/2013/91, and by the European Union, European Social Fund. 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PD APR PY 2015 VL 9 IS 2 BP 334 EP 348 DI 10.1016/j.joi.2015.02.008 PG 15 WC Information Science & Library Science SC Information Science & Library Science GA CE2JA UT WOS:000351640700007 ER PT J AU Huang, MH Yang, HW Chen, DZ AF Huang, Mu-Hsuan Yang, Hsiao-Wen Chen, Dar-Zen TI Increasing science and technology linkage in fuel cells: A cross citation analysis of papers and patents SO JOURNAL OF INFORMETRICS LA English DT Article DE Fuel cell; Cross citation; Science linkage; Technology linkage; Science cycle time; Technology cycle time ID SCIENTIFIC LITERATURE; KNOWLEDGE FLOWS; PUBLIC SCIENCE; INDICATORS; INNOVATION; OUTPUT; BIOTECHNOLOGY; BIBLIOMETRICS; STATISTICS; HYDROGEN AB This study aims to explore the relationship between science and technology via analyzing cross citations between papers and patents in fuel cells. 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Informetr. PD APR PY 2015 VL 9 IS 2 BP 237 EP 249 DI 10.1016/j.joi.2015.02.001 PG 13 WC Information Science & Library Science SC Information Science & Library Science GA CE2JA UT WOS:000351640700001 ER PT J AU Hurlimann, W AF Huerlimann, Werner TI On the uniform random upper bound family of first significant digit distributions SO JOURNAL OF INFORMETRICS LA English DT Article DE Benford's law; Stigler's law; Uniform distribution; Simulation algorithm; Extended truncated Pareto; Erlang distribution ID BENFORDS LAW; INFORMETRICS AB The first significant digit patterns arising from a mixture of uniform distributions with a random upper bound are revisited. A closed-form formula for its first significant digit distribution (FSD) is obtained. The one-parameter model of Rodriguez is recovered for an extended truncated Pareto mixing distribution. Considering additionally the truncated Erlang, gamma and Burr mixing distributions, and the generalized Benford law, for which another probabilistic derivation is offered, we study the fitting capabilities of the FSD's for various Benford like data sets from scientific research. Based on the results, we propose the general use of a fine structure index for Benford's law in case the data is well fitted by the truncated Erlang member of the uniform random upper bound family of FSD's. (C) 2015 Elsevier Ltd. All rights reserved. RP Hurlimann, W (reprint author), Feldstr 145, CH-8004 Zurich, Switzerland. EM whurlimann@bluewin.ch CR Aban IB, 2006, J AM STAT ASSOC, V101, P270, DOI 10.1198/016214505000000411 Alexopoulos T., 2014, J ASTROPHYS ASTRON, P1 Alves AD, 2014, SCIENTOMETRICS, V98, P173, DOI 10.1007/s11192-013-1030-8 Ausloos M, 2015, PHYSICA A, V419, P736, DOI 10.1016/j.physa.2014.10.041 Bar-Ilan J, 2008, J INFORMETR, V2, P1, DOI 10.1016/j.joi.2007.11.001 Beirlant J., 2014, EXTREME VALUE STAT T BROOKES BC, 1984, INFORM PROCESS MANAG, V20, P37, DOI 10.1016/0306-4573(84)90038-4 BROOKES BC, 1978, J AM SOC INFORM SCI, V29, P5, DOI 10.1002/asi.4630290104 Caceres H., 2008, ELECT J BIOMEDICINE, V1, P27 Campanario J. M., 2010, SCIENTOMETRICS, V88, P421 Egghe L., 1990, INTRO INFORMETRICS Q Egghe L, 2005, LIBR INFORM SCI SER, P1 Egghe L, 2012, J AM SOC INF SCI TEC, V63, P1662, DOI 10.1002/asi.22690 Egghe L., 2011, ISSI NEWSLETTER, V7, P55 Fox R. F., 2014, ARXIV14121536V2PHYSD Gradshteyn I. 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PD APR PY 2015 VL 9 IS 2 BP 349 EP 358 DI 10.1016/j.joi.2015.02.007 PG 10 WC Information Science & Library Science SC Information Science & Library Science GA CE2JA UT WOS:000351640700008 ER PT J AU Kretschmer, H Beaver, DD Ozel, B Kretschmer, T AF Kretschmer, Hildrun Beaver, Donald deB. Ozel, Bulent Kretschmer, Theo TI Who is collaborating with whom? Part I. Mathematical model and methods for empirical testing SO JOURNAL OF INFORMETRICS LA English DT Article DE Social network analysis; Self-organization; Mathematical model; Co-authorship; 3-D computer graphs; Animation ID GENDER; COAUTHORSHIP; PAIRS; LAW AB There are two versions in the literature of counting co-author pairs. Whereas the first version leads to a two-dimensional (2-D) power function distribution; the other version shows three-dimensional (3-D) graphs, totally rotatable around and their shapes are visible in space from all possible points of view. As a result, these new 3-D computer graphs, called "Social Gestalts" deliver more comprehensive information about social network structures than simple 2-D power function distributions. The mathematical model of Social Gestalts and the corresponding methods for the 3-D visualization and animation of collaboration networks are presented in Part I of this paper. Fundamental findings in psychology/sociology and physics are used as a basis for the development of this model. The application of these new methods to male and to female networks is shown in Part II. After regression analysis the visualized Social Gestalts are rather identical with the corresponding empirical distributions (R-2 >0.99). The structures of female co-authorship networks differ markedly from the structures of the male co-authorship networks. For female co-author pairs' networks, accentuation of productivity dissimilarities of the pairs is becoming visible but on the contrary, for male co-author pairs' networks, accentuation of productivity similarities of the pairs is expressed. (c) 2015 The Authors. Published by Elsevier Ltd. C1 [Kretschmer, Hildrun; Kretschmer, Theo] COLLNET Ctr, D-16540 Hohen Neuendorf, Germany. [Beaver, Donald deB.] Williams Coll, Williamstown, MA 01267 USA. [Ozel, Bulent] Univ Jaume 1, Dept Econ, Castellon De La Plana, Spain. RP Kretschmer, H (reprint author), COLLNET Ctr, Borgsdorfer Str 5, D-16540 Hohen Neuendorf, Germany. EM kretschmer.h@onlinehome.de; dbeaver@williams.edu; ozel@uji.es; kretschmer.h@onlinehome.de CR Bradford S. 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Informetr. PD APR PY 2015 VL 9 IS 2 BP 359 EP 372 DI 10.1016/j.joi.2015.01.004 PG 14 WC Information Science & Library Science SC Information Science & Library Science GA CE2JA UT WOS:000351640700009 ER PT J AU Kretschmer, H Beaver, DD Ozel, B Kretschmer, T AF Kretschmer, Hildrun Beaver, Donald deB. Ozel, Bulent Kretschmer, Theo TI Who is collaborating with whom? Part II. Application of the methods to male and to female networks SO JOURNAL OF INFORMETRICS LA English DT Article DE Social network analysis; Self-organization; Complementarities; Co-authorship; Gender; Mathematical model ID GENDER AB The theoretical approach of the mathematical model of Social Gestalts and the corresponding methods for the 3-D visualization and animation of collaboration networks are presented in Part I. The application of these new methods to male and female networks is shown in Part II. After regression analysis the visualized Social Gestalts are rather identically with the corresponding empirical distributions (R-2 >0.99). The structures of female co-authorship networks differ markedly from the structures of the male co-authorship networks. For female co-author pairs' networks, accentuation of productivity dissimilarities of the pairs is becoming visible but on the contrary, for male co-author pairs' networks, accentuation of productivity similarities of the pairs is expressed. (c) 2015 The Authors. Published by Elsevier Ltd. C1 [Kretschmer, Hildrun; Kretschmer, Theo] COLLNET Ctr, D-16540 Hohen Neuendmf, Germany. [Beaver, Donald deB.] Williams Coll, Williamstown, MA 01267 USA. [Ozel, Bulent] Univ Jaume 1, Dept Econ, Castellon De La Plana, Spain. RP Kretschmer, H (reprint author), COLLNET Ctr, Borgsdorfer Str 5, D-16540 Hohen Neuendmf, Germany. EM kretschmer.h@onlinehome.de; dbeaver@williams.edu; ozel@uji.es; kretschmer.h@onlinehome.de CR Dehdarirad T, 2014, SCIENTOMETRICS, V101, P273, DOI 10.1007/s11192-014-1327-2 Kretschmer H., 2009, P 5 INT C WEB INF SC Kretschmer H, 2012, SCIENTOMETRICS, V93, P135, DOI 10.1007/s11192-012-0661-5 Ozel B, 2014, SCIENTOMETRICS, V98, P703, DOI 10.1007/s11192-013-1145-y NR 4 TC 0 Z9 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 1751-1577 EI 1875-5879 J9 J INFORMETR JI J. Informetr. PD APR PY 2015 VL 9 IS 2 BP 373 EP 384 DI 10.1016/j.joi.2015.02.009 PG 12 WC Information Science & Library Science SC Information Science & Library Science GA CE2JA UT WOS:000351640700010 ER PT J AU Marzolla, M AF Marzolla, Moreno TI Quantitative analysis of the Italian National Scientific Qualification SO JOURNAL OF INFORMETRICS LA English DT Article DE National Scientific Qualification; ASN; Research evaluation; Bibliometrics; Italy ID H-INDEX AB The Italian National Scientific Qualification (ASN) was introduced in 2010 as part of a major reform of the national university system. Under the new regulation, the scientific qualification for a specific role (associate or full professor) and field of study is required to apply for a permanent professor position. The ASN is peculiar since it makes use of bibliometric indicators with associated thresholds as one of the parameters used to assess applicants. The first round of the ASN received 59,149 applications, and the results have been made publicly available for a short period of time, including the values of the quantitative indicators for each applicant. The availability of this wealth of information provides an opportunity to draw a fairly detailed picture of a nation-wide evaluation exercise, and to study the impact of the bibliometric indicators on the qualification results. In this paper, we provide a first account of the Italian National Scientific Qualification from a quantitative point of view. We show that significant differences exist among scientific disciplines, in particular with respect to the fraction of qualified applicants, that cannot be easily explained. Furthermore, we describe some issues related to the definition and use of the bibliometric indicators and the corresponding thresholds. Our analysis aims at drawing attention to potential problems that should be addressed by decision-makers in future rounds of the ASN. (c) 2015 Elsevier Ltd. All rights reserved. C1 Univ Bologna, Dept Comp Sci & Engn, I-40126 Bologna, Italy. RP Marzolla, M (reprint author), Univ Bologna, Dept Comp Sci & Engn, Mura Anteo Zamboni 7, I-40126 Bologna, Italy. 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Informetr. PD APR PY 2015 VL 9 IS 2 BP 285 EP 316 DI 10.1016/j.joi.2015.02.006 PG 32 WC Information Science & Library Science SC Information Science & Library Science GA CE2JA UT WOS:000351640700005 ER PT J AU Campanario, JM AF Miguel Campanario, Juan TI Providing impact: The distribution of JCR journals according to references they contribute to the 2-year and 5-year journal impact factors SO JOURNAL OF INFORMETRICS LA English DT Article DE Journal impact factor; Citations; References; Journal distribution ID SCIENTIFIC JOURNALS; CITATION ANALYSIS; NORMALIZATION; UNIVERSALITY; FREQUENCY; TIMES AB In general, scientometrics studies tend to focus on citations received from journals (incoming citations) and usually neglect references to journals (outgoing citations). The aim of this study is to suggest a new approach to the journal impact factor on a wider scale, i.e., from the viewpoint of citing journals. I studied how citations (references) given by JCR journals contribute to the 2-year and 5-year journal impact factors (JIF). To do so, data were obtained from the 2011 edition of JCR (Science Edition) available for universities in Spain, and the citing journal matrix for each journal was used. This matrix records the number of times articles published in other journals (cited journals) were cited in a given journal (citing journal) in 2011. The results showed that a set of 50 journals produced about 15% of all references that contributed to the 2-year JIF. Similarly, a set of 50 journals produced about 13% of all references that contributed to the 5-year JIF. A Bradford-like plot was obtained by plotting the cumulative number of references that contributed to the 2-year and 5-year JIF against the cumulative number of citing journals. The distribution of journals according to the number and percentage of references they contributed to the 2-year and 5-year JIF showed peaks. A rank-order distribution of references that contributed to the 2-year and 5 year JIF was obtained with a previously described empirical two-exponent equation. Based on the maximum contribution to the 2-year JIF of different 2-year rolling reference windows, the second rolling window (references to articles published 2 and 3 years before 2011) made the greatest contribution to impact in 41% of journals. (c) 2015 Elsevier Ltd. All rights reserved. C1 Univ Alcala De Henares, Dept Fis & Matemat, Madrid 28871, Spain. RP Campanario, JM (reprint author), Univ Alcala De Henares, Dept Fis & Matemat, Madrid 28871, Spain. 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Informetr. PD APR PY 2015 VL 9 IS 2 BP 398 EP 407 DI 10.1016/j.joi.2015.01.005 PG 10 WC Information Science & Library Science SC Information Science & Library Science GA CE2JA UT WOS:000351640700012 ER PT J AU Peng, TQ AF Peng, Tai-Quan TI Assortative mixing, preferential attachment, and triadic closure: A longitudinal study of tie-generative mechanisms in journal citation networks SO JOURNAL OF INFORMETRICS LA English DT Article DE Homophily; Preferential attachment; Triadic closure; ERGM ID P-ASTERISK MODELS; RANDOM GRAPH MODELS; SOCIAL NETWORKS; CENTRALITY; SCIENCE; BIRDS; INTERDISCIPLINARITY; INDICATORS; EMERGENCE; EVOLUTION AB This study reveals the roles of three tie-generative mechanisms, namely, assortative mixing, preferential attachment, and triadic closure, in forming citation links in journals through the exponential random graph modeling approach. The study also adopts a longitudinal design to examine how the roles of the three mechanisms evolve over time. The data involve citation exchanges in Internet research among 680 journals in 12 subject areas from 2000 to 2013. Assortative mixing by discipline and publication foci is a significant tie-generative mechanism in journal citation networks. The magnitude of as sortative mixing by discipline remains stable over time, whereas that by publication foci declines over time. Journals in Internet research demonstrate an increasing preference for influential journals to form citation links over time. The indegree of journals does not exert a significant impact on citation link formation among journals, whereas the outdegree of journals imposes a significantly negative impact on citation link formation among journals. Triadic closure is an important force that facilitates the formation of citation links among journals. The findings of this study improve our knowledge of the organizing principles that underlie journal citation networks and advance our understanding of the production process of scientific knowledge in Internet research. (c) 2015 Elsevier Ltd. All rights reserved. C1 Nanyang Technol Univ, Wee Kim Wee Sch Commun & Informat, Singapore 637718, Singapore. RP Peng, TQ (reprint author), Nanyang Technol Univ, Wee Kim Wee Sch Commun & Informat, 31 Nanyang Link, Singapore 637718, Singapore. 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TI Publication rate expressed by age, gender and academic position - A large-scale analysis of Norwegian academic staff SO JOURNAL OF INFORMETRICS LA English DT Article DE Publication; Productivity; Age; Gender; Academic; Position ID RESEARCH PRODUCTIVITY; SCIENTIFIC PRODUCTIVITY; RESEARCH PERFORMANCE; SEX-DIFFERENCES; SCIENCE; COLLABORATION; DETERMINANTS; EDUCATION; FACULTY; SYSTEM AB This study investigates how scientific performance in terms of publication rate is influenced by the gender, age and academic position of the researchers. Previous studies have shown that these factors are important variables when analysing scientific productivity at the individual level. What is new with our approach is that we have been able to identify the relative importance of the different factors based on regression analyses (OLS) of each major academic field. The study, involving almost 12,400 Norwegian university researchers, shows that academic position is more important than age and gender. In the fields analysed, the regression model can explain 13.5-19 per cent of the variance in the publication output at the levels of individuals. This also means that most of the variance in publication rate is due to other factors. (C) 2015 The Authors. Published by Elsevier Ltd. C1 [Rorstad, Kristoffer; Aksnes, Dag W.] NIFU Nord Inst Studies Innovat Res & Educ, NO-0167 Oslo, Norway. RP Rorstad, K (reprint author), NIFU Nord Inst Studies Innovat Res & Educ, Wergelandsveien 7, NO-0167 Oslo, Norway. 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B., 1996, HIGHER ED HDB THEORY, VXI Diem A, 2013, RES HIGH EDUC, V54, P86, DOI 10.1007/s11162-012-9264-5 Xie Y, 1998, AM SOCIOL REV, V63, P847, DOI 10.2307/2657505 NR 44 TC 0 Z9 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 1751-1577 EI 1875-5879 J9 J INFORMETR JI J. Informetr. PD APR PY 2015 VL 9 IS 2 BP 317 EP 333 DI 10.1016/j.joi.2015.02.003 PG 17 WC Information Science & Library Science SC Information Science & Library Science GA CE2JA UT WOS:000351640700006 ER PT J AU Thelwall, M Fairclough, R AF Thelwall, Mike Fairclough, Ruth TI Geometric journal impact factors correcting for individual highly cited articles SO JOURNAL OF INFORMETRICS LA English DT Article DE Journal impact factors; Mendeley; Altmetrics ID ACADEMIC JOURNALS; RANKINGS; SCIENCE; METRICS; INFORMATION; CITATIONS; ECONOMICS AB Journal impact factors (JIFs) are widely used and promoted but have important limitations. In particular, JIFs can be unduly influenced by individual highly cited articles and hence are inherently unstable. A logical way to reduce the impact of individual high citation counts is to use the geometric mean rather than the standard mean in JIF calculations. Based upon journal rankings 2004-2014 in 50 sub-categories within 5 broad categories, this study shows that journal rankings based on JIF variants tend to be more stable over time if the geometric mean is used rather than the standard mean. The same is true for JIF variants using Mendeley reader counts instead of citation counts. Thus, although the difference is not large, the geometric mean is recommended instead of the arithmetic mean for future JIF calculations. In addition, Mendeley readership-based JIF variants are as stable as those using Scopus citations, confirming the value of Mendeley readership as an academic impact indicator. (c) 2015 Elsevier Ltd. All rights reserved. C1 [Thelwall, Mike; Fairclough, Ruth] Wolverhampton Univ, Stat Cybermetr Res Grp, Sch Math & Comp Sci, Wolverhampton WV1 1LY, W Midlands, England. RP Thelwall, M (reprint author), Wolverhampton Univ, Stat Cybermetr Res Grp, Sch Math & Comp Sci, Wulfruna St, Wolverhampton WV1 1LY, W Midlands, England. 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PD APR PY 2015 VL 9 IS 2 BP 263 EP 272 DI 10.1016/j.joi.2015.02.004 PG 10 WC Information Science & Library Science SC Information Science & Library Science GA CE2JA UT WOS:000351640700003 ER PT J AU Abramo, G Cicero, T D'Angelo, CA AF Abramo, Giovanni Cicero, Tindaro D'Angelo, Ciriaco Andrea TI Should the research performance of scientists be distinguished by gender? SO JOURNAL OF INFORMETRICS LA English DT Article DE Research evaluation; Gender; Bibliometrics; Italy ID RESEARCH PRODUCTIVITY; RESEARCH COLLABORATION; LIFE SCIENCES; PUBLICATION PRODUCTIVITY; BIBLIOMETRIC INDICATORS; HIGHER-EDUCATION; SEX-DIFFERENCES; CITATIONS; COAUTHOR; IMPACT AB The literature on gender differences in research performance seems to suggest a gap between men and women, where the former outperform the latter. Whether one agrees with the different factors proposed to explain the phenomenon, it is worthwhile to verify if comparing the performance within each gender, rather than without distinction, gives significantly different ranking lists. If there were some structural factor that determined a penalty in performance of female researchers compared to their male peers, then under conditions of equal capacities of men and women, any comparative evaluations of individual performance that fail to account for gender differences would lead to distortion of the judgments in favor of men. In this work we measure the extent of differences in rank between the two methods of comparing performance in each field of the hard sciences: for professors in the Italian university system, we compare the distributions of research performance for men and women and subsequently the ranking lists with and without distinction by gender. The results are of interest for the optimization of efficient selection in formulation of recruitment, career advancement and incentive schemes. (C) 2014 Elsevier Ltd. All rights reserved. C1 [Abramo, Giovanni; D'Angelo, Ciriaco Andrea] Natl Res Council Italy, Inst Syst Anal & Comp Sci IASI CNR, Lab Studies Res & Technol Transfer, Rome, Italy. [Cicero, Tindaro] Italian Natl Agcy Evaluat Univ & Res Inst ANVUR, Rome, Italy. [D'Angelo, Ciriaco Andrea] Univ Roma Tor Vergata, Dept Engn & Management, Rome, Italy. RP Abramo, G (reprint author), Natl Res Council Italy, Inst Syst Anal & Comp Sci IASI CNR, Lab Studies Res & Technol Transfer, Rome, Italy. 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TI The relationship between the research performance of scientists and their position in co-authorship networks in three fields SO JOURNAL OF INFORMETRICS LA English DT Article DE Research performance; Collaboration; Social network analysis; Co-authorship; G-index; Poisson regression model ID COLLABORATION NETWORKS; STRUCTURAL HOLES; SOCIAL NETWORK; G-INDEX; IMPACT; CENTRALITY; PRODUCTIVITY; PERSPECTIVE; INNOVATION; INDUSTRY AB Research networks play a crucial role in the production of new knowledge since collaboration contributes to determine the cognitive and social structure of scientific fields and has a positive influence on research. This paper analyses the structure of co-authorship networks in three different fields (Nanoscience, Pharmacology and Statistics) in Spain over a three-year period (2006-2008) and explores the relationship between the research performance of scientists and their position in co-authorship networks. A denser co-authorship network is found in the two experimental fields than in Statistics, where the network is of a less connected and more fragmented nature. Using the g-index as a proxy for individual research performance, a Poisson regression model is used to explore how performance is related to different co-authorship network measures and to disclose interfield differences. The number of co-authors (degree centrality) and the strength of links show a positive relationship with the g-index in the three fields. Local cohesion presents a negative relationship with the g-index in the two experimental fields, where open networks and the diversity of co-authors seem to be beneficial. No clear advantages from intermediary positions (high betweenness) or from being linked to well-connected authors (high eigenvector) can be inferred from this analysis. In terms of g-index, the benefits derived by authors from their position in co-authorship networks are larger in the two experimental fields than in the theoretical one. (C) 2014 Elsevier Ltd. All rights reserved. C1 [Bordons, Maria; Diaz-Faes, Adrian A.] CSIC, IFS, Madrid 28037, Spain. [Aparicio, Javier; Gonzalez-Albo, Borja] CSIC, Ctr Humanities & Social Sci CCHS, Madrid 28037, Spain. RP Bordons, M (reprint author), CSIC, IFS, Albasanz 26-28, Madrid 28037, Spain. 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Informetr. PD JAN PY 2015 VL 9 IS 1 BP 135 EP 144 DI 10.1016/j.joi.2014.12.001 PG 10 WC Information Science & Library Science SC Information Science & Library Science GA CB6XO UT WOS:000349770500014 ER PT J AU Chakraborty, T Tammana, V Ganguly, N Mukherjee, A AF Chakraborty, Tanmoy Tammana, Vihar Ganguly, Niloy Mukherjee, Animesh TI Understanding and modeling diverse scientific careers of researchers SO JOURNAL OF INFORMETRICS LA English DT Article DE Scientific career; Diversity; Stochastic model ID ACADEMIC DISCIPLINES; COLLABORATION NETWORKS; FIELD MOBILITY; SCIENCE; NETHERLANDS; PHYSICISTS AB This paper analyzes the diverse scientific careers of researchers in order to understand the key factors that could lead to a successful career. Essentially, we intend to answer some specific questions pertaining to a researcher's scientific career - What are the local and the global dynamics regulating a researcher's decision to select a new field of research at different points of her entire career? What are the suitable quantitative indicators to measure the diversity of a researcher's scientific career? We propose two entropy-based metrics to measure a researcher's choice of research topics. Experiments with large computer science bibliographic dataset reveal that there is a strong correlation between the diversity of the career of a researcher and her success in scientific research in terms of the number of citations. We observe that while most of the researchers are biased toward either adopting diverse research fields or concentrating on very few fields, a majority of the prominent researchers tend to follow a typical "scatter-gather" policy - although their entire careers are immensely diverse with different types of fields selected at different time periods, they remain focused primarily in at most one or two fields at any particular time point of their career. Finally, we propose a stochastic model which, quite accurately, mimics the notion of field selection process observed in the real publication dataset. (C) 2014 Elsevier Ltd. All rights reserved. C1 [Chakraborty, Tanmoy; Ganguly, Niloy; Mukherjee, Animesh] Indian Inst Technol, Dept Comp Sci & Engn, Kharagpur 721302, W Bengal, India. [Tammana, Vihar] Microsoft Corp, Bellevue, WA USA. RP Chakraborty, T (reprint author), Indian Inst Technol, Dept Comp Sci & Engn, Kharagpur 721302, W Bengal, India. 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Jarmelo, Susana Formosinho, Sebastiao J. Sergio Seixas de Melo, J. Pais, Alberto A. C. C. TI Unsupervised characterization of research institutions with task-force estimation SO JOURNAL OF INFORMETRICS LA English DT Article DE Task-force; Scientific productivity; Scientific collaboration; Scientific leadership; Research indicators ID ACADEMIC-INSTITUTIONS; CITATION IMPACT; RESEARCH PERFORMANCE; UNIVERSITIES; SCIENCE; INDEX; PUBLICATION; METHODOLOGY; INDICATORS; ADDRESSES AB This work aims at establishing the task-force involved in scientific production at the institutional or national level, globally or per area or sub-area of knowledge. In the proposed system, the estimated task-force is further divided into core (permanent members of the institution(s)) and collaborators (more mobile members), and allows normalization of scientific production. Research groups/institutions/countries of different sizes/scientific areas can, thus, be directly compared and the time evolution of these groups inspected. Results are presented for the characterization of four universities (from Portugal, Sweden and USA) in the 2008-2012 period, for the research area of Chemistry. It is shown that it is possible not only to estimate the task-force, but also to derive new, relevant indicators for the set under analysis. Aspects pertaining to collaboration fluxes are also assessed. (C) 2014 Elsevier Ltd. All rights reserved. C1 [Cova, Tania F. G. C.; Formosinho, Sebastiao J.; Sergio Seixas de Melo, J.; Pais, Alberto A. C. C.] Univ Coimbra, Dept Chem, Ctr Chem Coimbra, P-3004535 Coimbra, Portugal. [Jarmelo, Susana; Sergio Seixas de Melo, J.] Univ Coimbra, Fac Sci & Technol, Ctr Chem Coimbra, P-3030790 Coimbra, Portugal. RP Pais, AACC (reprint author), Univ Coimbra, Dept Chem, Ctr Chem Coimbra, P-3004535 Coimbra, Portugal. 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Informetr. PD JAN PY 2015 VL 9 IS 1 BP 59 EP 68 DI 10.1016/j.joi.2014.11.005 PG 10 WC Information Science & Library Science SC Information Science & Library Science GA CB6XO UT WOS:000349770500008 ER PT J AU Egghe, L AF Egghe, Leo TI Message from the retiring Editor-in-Chief SO JOURNAL OF INFORMETRICS LA English DT Editorial Material NR 0 TC 0 Z9 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 1751-1577 EI 1875-5879 J9 J INFORMETR JI J. Informetr. PD JAN PY 2015 VL 9 IS 1 BP A1 EP A2 DI 10.1016/j.joi.2015.01.007 PG 2 WC Information Science & Library Science SC Information Science & Library Science GA CB6XO UT WOS:000349770500001 ER PT J AU Ennas, G Di Guardo, MC AF Ennas, Gianfranco Di Guardo, Maria Chiara TI Features of top-rated gold open access journals: An analysis of the scopus database SO JOURNAL OF INFORMETRICS LA English DT Article DE Gold open access ranking; Open access impact analysis; SJR; Open access journals ID IMPACT FACTOR; CITATION IMPACT; ARTICLES AB Purpose: The goal is to identify the features of top-rated gold open access (OA) journals by testing seven main variables: languages, countries, years of activity and years in the DOAJ repository, publication fee, the field of study, whether the journal has been launched as OA or converted, and the type of publisher. Sample: A sample of 1910 gold OA journals has been obtained by combining Scopus SJR 2012, the DOAJ, and data provided by previous studies (Solomon, 2013). Method: We have divided the SJR index into quartiles for all journals' subject areas. First, we show descriptive statistics by combining quartiles based on their features. Then, after having converted the quartiles into a dummy variable, we test it as a dependent variable in a binary logistic regression. Contribute: This work contributes empirically to better understanding the gold OA efficacy of data analysis, which may be helpful in improving journals' rankings in the areas where this is still a struggle. Findings: Significant results have been found for all variables, except for the types of publishers, and for born or converted journals. (C) 2014 Elsevier Ltd. All rights reserved. C1 [Ennas, Gianfranco; Di Guardo, Maria Chiara] Univ Cagliari, Dept Econ & Business, I-09123 Cagliari, Italy. RP Ennas, G (reprint author), Univ Cagliari, Dept Econ & Business, Viale S Ignazio 17, I-09123 Cagliari, Italy. 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PD JAN PY 2015 VL 9 IS 1 BP 79 EP 89 DI 10.1016/j.joi.2014.11.007 PG 11 WC Information Science & Library Science SC Information Science & Library Science GA CB6XO UT WOS:000349770500010 ER PT J AU Feng, F Zhang, LY Du, YN Wang, WG AF Feng, Feng Zhang, Leiyong Du, Yuneng Wang, Weiguang TI Visualization and quantitative study in bibliographic databases: A case in the field of university-industry cooperation SO JOURNAL OF INFORMETRICS LA English DT Article DE Bibliometrics; Visualizing; Quantitative; CiteSpace; University-industry collaboration ID AUTHOR COCITATION ANALYSIS; INFORMATION-SCIENCE; TECHNOLOGY-TRANSFER; ACADEMIC RESEARCH; PEARSONS R; INNOVATION; NETWORKS; BIBLIOMETRICS; LINKS AB CiteSpace is a visual document analysis software, by which performances and trends of certain disciplines can be displayed for a given period. Moreover, the evolution of a frontier research can be explored by such software as well. This research focuses on the visualization and quantitative study in bibliographic databases by taking the university-industry collaboration studies as an example. Using the Web of Science (WOS), 587 publications and over 30,000 references were selected for analysis, which produced the following results: (1) Our method can clearly reveal the key elements of certain disciplines, such as the largest share of publications, the most frequently cited authors and journals in the university-industry cooperation research field; (2) The relationships among the frequently cited authors, references, journals and keywords can be explained visually in the university-industry cooperation research field; (3) Of special note is that the potential problems and evolutionary trends of certain research fields such as university-industry cooperation can also be ascertained via our method; (4) In general, according to the case study, our visualization and quantitative method evolved a new research framework to evaluate the performance of some research areas. (C) 2014 Elsevier Ltd. All rights reserved. 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PD JAN PY 2015 VL 9 IS 1 BP 118 EP 134 DI 10.1016/j.joi.2014.11.009 PG 17 WC Information Science & Library Science SC Information Science & Library Science GA CB6XO UT WOS:000349770500013 ER PT J AU Hanssen, TES Jorgensen, F AF Hanssen, Thor-Erik Sandberg Jorgensen, Finn TI The value of experience in research SO JOURNAL OF INFORMETRICS LA English DT Article DE Human capital; Experience; Citation count; Publications; Negative binomial model ID CITATION COUNTS; SCIENTIFIC-PRODUCTIVITY; ARTICLE IMPACT; DOWNLOADS; JOURNALS; BEHAVIOR; SCIENCE; QUALITY; TITLES; AUTHOR AB This article examines how different factors influence the number of times articles in the five most recognized transportation journals are cited. The effects of most of the explanatory variables indicating the characteristics of articles, authors and journals correspond with earlier studies of citation counts. Special focus in this study is placed on estimating the relationship between researchers' human capital or skills and their experience. For the purpose of this study, human capital is defined as a scientist's ability to conduct research at the frontier of his or her discipline and is measured by how frequently his or her research is cited. Experience is measured by counting the number of their previous scientific articles. Using negative binomial regression, we find that experience offers a statistically significant positive effect on the human capital of scientists. However, this effect diminishes rapidly with the level of experience. This suggests that young researchers relatively quickly learn the skills and gain the knowledge necessary to produce high-quality research. (C) 2014 Elsevier Ltd. All rights reserved. C1 [Hanssen, Thor-Erik Sandberg; Jorgensen, Finn] Univ Nordland, Bodo Grad Sch Business, NO-8049 Bodo, Norway. 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PD JAN PY 2015 VL 9 IS 1 BP 16 EP 24 DI 10.1016/j.joi.2014.11.003 PG 9 WC Information Science & Library Science SC Information Science & Library Science GA CB6XO UT WOS:000349770500004 ER PT J AU Kim, J Diesner, J AF Kim, Jinseok Diesner, Jana TI The effect of data pre-processing on understanding the evolution of collaboration networks SO JOURNAL OF INFORMETRICS LA English DT Article DE Collaboration network; Network evolution; Name ambiguity; Disambiguation ID AUTHOR NAME DISAMBIGUATION; SCIENTIFIC COLLABORATION; SCIENCE AB This paper shows empirically how the choice of certain data pre-processing methods for disambiguating author names affects our understanding of the structure and evolution of co-publication networks. Thirty years of publication records from 125 Information Systems journals were obtained from DBLP. Author names in the data were pre-processed via algorithmic disambiguation. We applied the commonly used all-initials and first-initial based disambiguation methods to the data, generated over-time networks with a yearly resolution, and calculated standard network metrics on these graphs. Our results show that initial-based methods underestimate the number of unique authors, average distance, and clustering coefficient, while overestimating the number of edges, average degree, and ratios of the largest components. These self-reinforcing growth and shrinkage mechanisms amplify over time. This can lead to false findings about fundamental network characteristics such as topology and reasoning about underlying social processes. It can also cause erroneous predictions of trends in future network evolution and suggest unjustified policies, interventions and funding decisions. The findings from this study suggest that scholars need to be more attentive to data pre-processing when analyzing or reusing bibliometric data. (C) 2015 Elsevier Ltd. All rights reserved. C1 [Kim, Jinseok; Diesner, Jana] Univ Illinois, Grad Sch Lib & Informat Sci, Champaign, IL 61820 USA. RP Kim, J (reprint author), Univ Illinois, Grad Sch Lib & Informat Sci, 501 East Daniel St, Champaign, IL 61820 USA. EM jkim362@illinois.edu CR Abramo G, 2013, J INFORMETR, V7, P442, DOI 10.1016/j.joi.2013.01.009 Barabasi AL, 2002, PHYSICA A, V311, P590, DOI 10.1016/S0378-4371(02)00736-7 Brandes U, 2001, J MATH SOCIOL, V25, P163 Cavero JM, 2014, SCIENTOMETRICS, V98, P2103, DOI 10.1007/s11192-013-1178-2 Cavusoglu A, 2013, CHAOS SOLITON FRACT, V57, P9, DOI 10.1016/j.chaos.2013.07.022 Clauset A, 2009, SIAM REV, V51, P661, DOI 10.1137/070710111 Cota RG, 2010, J AM SOC INF SCI TEC, V61, P1853, DOI 10.1002/asi.21363 De Nooy W., 2011, EXPLORATORY SOCIAL N Deville P., 2014, SCI REPORTS, V4 Eom YH, 2014, SCI REP-UK, V4, DOI 10.1038/srep04603 Fegley B. 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A., 2009, P 9 ACM IEEE CS JOIN Radicchi F., 2009, PHYS REV E, V80 Shin D, 2014, SCIENTOMETRICS, V100, P15, DOI 10.1007/s11192-014-1289-4 Strotmann A, 2012, J AM SOC INF SCI TEC, V63, P1820, DOI 10.1002/asi.22695 Wagner CS, 2005, RES POLICY, V34, P1608, DOI 10.1016/j.respol.2005.08.002 YOSHIKANE F., 2004, SCIENTOMETRICS, V60, P435, DOI 10.1023/B:SCIE.0000034385.05897.46 NR 29 TC 0 Z9 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 1751-1577 EI 1875-5879 J9 J INFORMETR JI J. Informetr. PD JAN PY 2015 VL 9 IS 1 BP 226 EP 236 DI 10.1016/j.joi.2015.01.002 PG 11 WC Information Science & Library Science SC Information Science & Library Science GA CB6XO UT WOS:000349770500022 ER PT J AU Kraker, P Schlogl, C Jack, K Lindstaedt, S AF Kraker, Peter Schloegl, Christian Jack, Kris Lindstaedt, Stefanie TI Visualization of co-readership patterns from an online reference management system SO JOURNAL OF INFORMETRICS LA English DT Article DE Relational scientometrics; Topical distribution; Knowledge domain visualization; Mapping; Altmetrics; Readership statistics ID COCITATION ANALYSIS; SCIENCE; USAGE; CITATION; METRICS; IMPACT; INFORMATION AB In this paper, we analyze the adequacy and applicability of readership statistics recorded in social reference management systems for creating knowledge domain visualizations. First, we investigate the distribution of subject areas in user libraries of educational technology researchers on Mendeley. The results show that around 69% of the publications in an average user library can be attributed to a single subject area. Then, we use co-readership patterns to map the field of educational technology. The resulting visualization prototype, based on the most read publications in this field on Mendeley, reveals 13 topic areas of educational technology research. The visualization is a recent representation of the field: 80% of the publications included were published within ten years of data collection. The characteristics of the readers, however, introduce certain biases to the visualization. Knowledge domain visualizations based on readership statistics are therefore multifaceted and timely, but it is important that the characteristics of the underlying sample are made transparent. (C) 2015 Elsevier Ltd. All rights reserved. C1 [Kraker, Peter; Lindstaedt, Stefanie] Know Ctr, A-8010 Graz, Austria. [Schloegl, Christian] Graz Univ, A-8010 Graz, Austria. 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Informetr. PD JAN PY 2015 VL 9 IS 1 BP 169 EP 182 DI 10.1016/j.joi.2014.12.003 PG 14 WC Information Science & Library Science SC Information Science & Library Science GA CB6XO UT WOS:000349770500018 ER PT J AU Lafouge, T Agouzal, A AF Lafouge, Thierry Agouzal, Abdelatif TI The source-effort coverage of an exponential informetric process SO JOURNAL OF INFORMETRICS LA English DT Article DE Inverse power distribution; Mathematical adjustment; Effort function; Entropy; Exponential distribution ID DISTRIBUTIONS AB Lotkaian informetrics is the framework most often used to study statistical distributions in the production and usage of information. Although Lotkaian distributions are traditionally used to characterize the Information Production Process (IPP), we have shown in a previous article that the IPP can successfully be studied using the effort function - the latter having been initially introduced to define the Exponential Informetric Process (EIP). These themes continue to be developed in this article, in which we present a necessary and sufficient condition for the existence of the EIP. Our current approach is similar to the one used to study IPPs. Inverse power and exponential distributions serve to illustrate the results obtained in the context of an EIP. Numerical examples are discussed. (C) 2014 Elsevier Ltd. All rights reserved. C1 [Lafouge, Thierry] EA 4147, ELICO, Villeurbanne, France. [Agouzal, Abdelatif] Univ Lyon 1, CNRS UMR 5208, Inst Camille Jordan, F-69622 Villeurbanne, France. RP Lafouge, T (reprint author), EA 4147, ELICO, Villeurbanne, France. 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PD JAN PY 2015 VL 9 IS 1 BP 156 EP 168 DI 10.1016/j.joi.2014.12.004 PG 13 WC Information Science & Library Science SC Information Science & Library Science GA CB6XO UT WOS:000349770500017 ER PT J AU Liang, LM Zhong, Z Rousseau, R AF Liang, Liming Zhong, Zhen Rousseau, Ronald TI Uncited papers, uncited authors and uncited topics: A case study in library and information science SO JOURNAL OF INFORMETRICS LA English DT Article DE Uncitedness; Uncited articles; Uncited authors; Uncited topics and their definitions; Scope of a journal ID CITED PAPERS; ARTICLES; BIBLIOMETRICS; LANCET; NEVER AB In this article we study three types of uncitedness in Library and Information Science journals: uncitedness for articles, authors and topics. One important aspect in this study is giving accurate definitions of the indicators for measuring uncited papers, uncited authors and uncited topics. It is found that for the period 1991-2010 ratios of uncited papers fluctuate within the interval [0,0.1]. This ratio is relatively stable and not very high. Comparison of average number of pages, average number of references, average number of authors per paper and percentage of single-authored papers between cited and uncited papers shows that no matter the journal, the first three indicators' values for uncited papers are lower, while the values of the fourth indicator are higher, than the corresponding values for cited papers. The fact that almost all uncited authors in a journal published only one paper in this journal illustrates that a journal's uncited authors are the least productive authors in this journal. Yet, productive and highly cited authors also publish uncited papers. As to why some topics fall into the group of uncited topics, the hypothesis is that the combination of unfamiliar keywords forms an unfamiliar topic, a topic authors have elected not to study further. Another assumption is that some uncited topics fall outside the field of Library and Information Science. Retrieval results in the Web of Science for a set of uncited keywords and keyword combinations support this assumption. (C) 2014 Elsevier Ltd. All rights reserved. C1 [Liang, Liming] Henan Normal Univ, Inst Sci Technol & Soc, Xinxiang 453007, Peoples R China. [Zhong, Zhen] Henan Univ Technol, Sch Management, Zhengzhou 450001, Peoples R China. [Rousseau, Ronald] Univ Antwerp, IOIW IBW, B-2000 Antwerp, Belgium. [Rousseau, Ronald] Katholieke Univ Leuven, Dept Math, B-3000 Heverlee, Belgium. RP Liang, LM (reprint author), Henan Normal Univ, Inst Sci Technol & Soc, Xinxiang 453007, Peoples R China. EM liangliming1949@sina.com; zhongzhen@haut.edu.cn; ronald.rousseau@khbo.be CR Abramo G, 2014, J INFORMETR, V8, P89, DOI 10.1016/j.joi.2013.10.011 Bar-Ilan J, 2008, J INFORMETR, V2, P1, DOI 10.1016/j.joi.2007.11.001 Bornmann L, 2014, RES EVALUAT, V23, P166, DOI 10.1093/reseval/rvu002 Bott D. 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F. J., 2004, SCIENTOMETRICS, V59, P461, DOI 10.1023/B:SCIE.0000018543 Wallace ML, 2009, J INFORMETR, V3, P296, DOI 10.1016/j.joi.2009.03.010 NR 23 TC 0 Z9 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 1751-1577 EI 1875-5879 J9 J INFORMETR JI J. Informetr. PD JAN PY 2015 VL 9 IS 1 BP 50 EP 58 DI 10.1016/j.joi.2014.11.001 PG 9 WC Information Science & Library Science SC Information Science & Library Science GA CB6XO UT WOS:000349770500007 ER PT J AU Ortega, JL AF Luis Ortega, Jose TI Relationship between altmetric and bibliometric indicators across academic social sites: The case of CSIC's members SO JOURNAL OF INFORMETRICS LA English DT Article DE CSIC; Altmetrics; Bibliometrics; Academic social network sites; Academic search engines ID GOOGLE SCHOLAR; SCIENTIFIC IMPACT; CITATIONS; METRICS; SEARCH AB This study explores the connections between social and usage metrics (altmetrics) and bibliometric indicators at the author level. It studies to what extent these indicators, gained from academic sites, can provide a proxy for research impact. Close to 10,000 author profiles belonging to the Spanish National Research Council were extracted from the principal scholarly social sites: ResearchGate, Academia.edu and Mendeley and academic search engines: Microsoft Academic Search and Google Scholar Citations. Results describe little overlapping between sites because most of the researchers only manage one profile (72%). Correlations point out that there is scant relationship between altmetric and bibliometric indicators at author level. This is due to the almetric ones are site-dependent, while the bibliometric ones are more stable across web sites. It is concluded that altmetrics could reflect an alternative dimension of the research performance, close, perhaps, to science popularization and networking abilities, but far from citation impact. (C) 2014 Elsevier Ltd. All rights reserved. C1 CCHS CSIC, Cybermetr Lab, Madrid 28037, Spain. RP Ortega, JL (reprint author), CCHS CSIC, Cybermetr Lab, Albasanz 26-28, Madrid 28037, Spain. 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L., 2014, CHANDOS INF PROF SER Ortega JL, 2014, J ASSOC INF SCI TECH, V65, P1149, DOI 10.1002/asi.23036 Ortega JL, 2012, J AM SOC INF SCI TEC, V63, P2370, DOI 10.1002/asi.22761 Perneger TV, 2004, BRIT MED J, V329, P546, DOI 10.1136/bmj.329.7465.546 Pitts M., 2014, P 17 INT C EXT DAT T, P648 Ponte D, 2011, SERIALS REV, V37, P149, DOI 10.1016/j.serrev.2011.06.002 Priem J., 2012, ARXIV12034745, DOI 10.1371/journal.pone.0006022 Priem J., 2010, 1 MONDAY, V15 ResearchGate, 2014, RG SCOR FAW RES Rowlands I, 2011, LEARN PUBL, V24, P183, DOI 10.1087/20110306 Thelwall M, 2014, J ASSOC INF SCI TECH, V65, P721, DOI 10.1002/asi.23038 Thelwall M, 2013, PLOS ONE, V8, DOI 10.1371/journal.pone.0064841 Thelwall M., 2014, J ASS INFORM SCI TEC Wallace D., 2013, SEARCH ENGINE J Watson A. B., 2009, J VISION, V9 Zahedi Z., 2013, PLOS ALM WORKSH SAN NR 44 TC 0 Z9 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 1751-1577 EI 1875-5879 J9 J INFORMETR JI J. Informetr. PD JAN PY 2015 VL 9 IS 1 BP 39 EP 49 DI 10.1016/j.joi.2014.11.004 PG 11 WC Information Science & Library Science SC Information Science & Library Science GA CB6XO UT WOS:000349770500006 ER PT J AU Rousseau, R Zhao, SX AF Rousseau, Ronald Zhao, Star X. TI A general conceptual framework for characterizing the ego in a network SO JOURNAL OF INFORMETRICS LA English DT Article DE Network analysis; h-Index; h-Degree; a-Index; g-Index; Zipf list ID HIRSCH-TYPE INDEXES; WEIGHTED NETWORKS; H-DEGREE; CENTRALITY AB In this contribution we consider one particular node in a network, referred to as the ego. We combine Zipf lists and ego measures to put forward a conceptual framework for characterizing this particular node. In this framework we unify different forms of h-indices, in particular the h-degree, introduced in the literature. Similarly, different forms of the g-index, the a-index and the R-index are unified. We focus on the pure mathematical and logical concepts, referring to the existing literature for practical examples. (C) 2014 Elsevier Ltd. All rights reserved. C1 [Rousseau, Ronald] UA, IBW, B-2000 Antwerp, Belgium. [Rousseau, Ronald] Katholieke Univ Leuven, Dept Math, B-3000 Leuven, Belgium. [Zhao, Star X.] E China Normal Univ, Sch Business, Dept Informat Sci, Shanghai 200241, Peoples R China. RP Zhao, SX (reprint author), E China Normal Univ, Room 437,Bldg Law & Business,500 Dongchuan Rd, Shanghai 200241, Peoples R China. 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Informetr. PD JAN PY 2015 VL 9 IS 1 BP 145 EP 149 DI 10.1016/j.joi.2011.12.002 PG 5 WC Information Science & Library Science SC Information Science & Library Science GA CB6XO UT WOS:000349770500015 ER PT J AU Ruiz-Castillo, J Waltman, L AF Ruiz-Castillo, Javier Waltman, Ludo TI Field-normalized citation impact indicators using algorithmically constructed classification systems of science SO JOURNAL OF INFORMETRICS LA English DT Article DE Field normalization; Classification systems; Clustering methodology; Citation impact indicators; University rankings ID CHARACTERISTIC SCORES; RESEARCH PERFORMANCE; SCALES; DISTRIBUTIONS; UNIVERSALITY; NETWORKS; SKEWNESS AB We study the problem of normalizing citation impact indicators for differences in citation practices across scientific fields. Normalization of citation impact indicators is usually done based on a field classification system. In practice, the Web of Science journal subject categories are often used for this purpose. However, many of these subject categories have a quite broad scope and are not sufficiently homogeneous in terms of citation practices. As an alternative, we propose to work with algorithmically constructed classification systems. We construct these classification systems by performing a large-scale clustering of publications based on their citation relations. In our analysis, 12 classification systems are constructed, each at a different granularity level. The number of fields in these systems ranges from 390 to 73,205 in granularity levels 1-12. This contrasts with the 236 subject categories in the WoS classification system. Based on an investigation of some key characteristics of the 12 classification systems, we argue that working with a few thousand fields may be an optimal choice. We then study the effect of the choice of a classification system on the citation impact of the 500 universities included in the 2013 edition of the CWTS Leiden Ranking. We consider both the MNCS and the PPtop 10% indicator. Globally, for all the universities taken together citation impact indicators generally turn out to be relatively insensitive to the choice of a classification system. Nevertheless, for individual universities, we sometimes observe substantial differences between indicators normalized based on the journal subject categories and indicators normalized based on an appropriately chosen algorithmically constructed classification system. (C) 2014 Elsevier Ltd. All rights reserved. C1 [Ruiz-Castillo, Javier] Univ Carlos III Madrid, Dept Econ, E-28903 Getafe, Spain. [Waltman, Ludo] Leiden Univ, Ctr Sci & Technol Studies, NL-2300 RA Leiden, Netherlands. RP Ruiz-Castillo, J (reprint author), Univ Carlos III Madrid, Dept Econ, E-28903 Getafe, Spain. 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Informetr. PD JAN PY 2015 VL 9 IS 1 BP 102 EP 117 DI 10.1016/j.joi.2014.11.010 PG 16 WC Information Science & Library Science SC Information Science & Library Science GA CB6XO UT WOS:000349770500012 ER PT J AU Schreiber, M AF Schreiber, Michael TI Restricting the h-index to a publication and citation time window: A case study of a timed Hirsch index SO JOURNAL OF INFORMETRICS LA English DT Article DE h-Index; Hirsch index; Evaluation; Citation analysis; Citation time window; Publication time window ID PREDICTIVE POWER; IMPACT; PROPOSAL AB The h-index has been shown to increase in many cases mostly because of citations to rather old publications. This inertia can be circumvented by restricting the evaluation to a publication and citation time window. Here I report results of an empirical study analyzing the evolution of the thus defined timed h-index in dependence on the length of the time window. (C) 2014 Elsevier Ltd. All rights reserved. C1 Tech Univ Chemnitz, Inst Phys, D-09107 Chemnitz, Germany. RP Schreiber, M (reprint author), Tech Univ Chemnitz, Inst Phys, D-09107 Chemnitz, Germany. EM schreiber@physik.tu-chemnitz.de CR Acuna DE, 2012, NATURE, V489, P201, DOI 10.1038/489201a Adams J, 2005, SCIENTOMETRICS, V63, P567, DOI 10.1007/s11192-005-0228-9 Bornmann L, 2014, J INFORMETR, V8, P175, DOI 10.1016/j.joi.2013.11.005 Bornmann L, 2009, EUR J ORG CHEM, P1471, DOI 10.1002/ejoc.200801243 Fiala D, 2014, J ASSOC INF SCI TECH, V65, P850, DOI 10.1002/asi.23049 Garcia-Perez MA, 2013, J INFORMETR, V7, P542, DOI 10.1016/j.joi.2013.01.010 Hirsch JE, 2007, P NATL ACAD SCI USA, V104, P19193, DOI 10.1073/pnas.0707962104 Levitt JM, 2011, INFORM PROCESS MANAG, V47, P300, DOI 10.1016/j.ipm.2010.09.005 Liang LM, 2009, PRO INT CONF SCI INF, V1, P143 Mazloumian A, 2012, PLOS ONE, V7, DOI 10.1371/journal.pone.0049246 Pan RK, 2014, SCI REP-UK, V4, DOI 10.1038/srep04880 Penner O, 2013, PHYS TODAY, V66, P8 Rousseau R, 2008, J AM SOC INF SCI TEC, V59, P1853, DOI 10.1002/asi.20890 Schreiber M, 2013, J INFORMETR, V7, P325, DOI 10.1016/j.joi.2013.01.001 Schreiber M, 2008, J AM SOC INF SCI TEC, V59, P1513, DOI 10.1002/asi.20856 Schreiber M., 2015, J AM SOC INFORM SCI Schreiber M, 2009, ANN PHYS-BERLIN, V18, P607, DOI 10.1002/andp.200910360 Sidiropoulos A., 2006, SCIENTOMETRICS, V2, P253 Stern DI, 2014, PLOS ONE, V9, DOI 10.1371/journal.pone.0112520 van Eck NJ, 2008, J INFORMETR, V2, P263, DOI 10.1016/j.joi.2008.09.004 Van Raan AFJ, 2006, SCIENTOMETRICS, V67, P491, DOI 10.1556/Scient.67.2006.3.10 Waltman L, 2011, SCIENTOMETRICS, V87, P467, DOI 10.1007/s11192-011-0354-5 Wang J, 2013, SCIENTOMETRICS, V94, P851, DOI 10.1007/s11192-012-0775-9 NR 23 TC 0 Z9 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 1751-1577 EI 1875-5879 J9 J INFORMETR JI J. Informetr. PD JAN PY 2015 VL 9 IS 1 BP 150 EP 155 DI 10.1016/j.joi.2014.12.005 PG 6 WC Information Science & Library Science SC Information Science & Library Science GA CB6XO UT WOS:000349770500016 ER PT J AU Waltman, L AF Waltman, Ludo TI Untitled SO JOURNAL OF INFORMETRICS LA English DT Editorial Material C1 Leiden Univ, Ctr Sci & Technol Studies, NL-2300 RA Leiden, Netherlands. RP Waltman, L (reprint author), Leiden Univ, Ctr Sci & Technol Studies, NL-2300 RA Leiden, Netherlands. EM waltmanlr@cwts.leidenuniv.nl CR Egghe L, 2012, J INFORMETR, V6, P422, DOI 10.1016/j.joi.2012.02.003 Frey BS, 2003, PUBLIC CHOICE, V116, P205, DOI 10.1023/A:1024208701874 NR 2 TC 0 Z9 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 1751-1577 EI 1875-5879 J9 J INFORMETR JI J. Informetr. PD JAN PY 2015 VL 9 IS 1 BP A3 EP A6 DI 10.1016/j.joi.2015.01.008 PG 4 WC Information Science & Library Science SC Information Science & Library Science GA CB6XO UT WOS:000349770500002 ER PT J AU Wang, J Hicks, D AF Wang, Jian Hicks, Diana TI Scientific teams: Self-assembly, fluidness, and interdependence SO JOURNAL OF INFORMETRICS LA English DT Article DE Organization of science; Team science; Social networks; Research collaboration ID RESEARCH-AND-DEVELOPMENT; CROSS-FUNCTIONAL TEAMS; RESEARCH COLLABORATION; MULTITEAM SYSTEMS; CO-AUTHORSHIPS; PERFORMANCE; IMPACT; SCIENCE; CREATIVITY; MODELS AB Science is increasingly produced in collaborative teams, but collaborative teams in science are self-assembled and fluid. Such characteristics call for a network approach to account for external activities responsible for team product but taking place beyond closed team boundaries in the open network. Given such characteristics of collaborative teams in science, we empirically test the interdependence between collaborative teams in the same network. Specifically, using fixed effects Poisson models and panel data of 1310 American scientists' life-time publication histories, we demonstrate knowledge spillovers from new collaborators to other teams not involving these new collaborators. Our findings have important implications for studying the organization of science. (C) 2014 Elsevier Ltd. All rights reserved. C1 [Wang, Jian] Univ Leuven, Ctr R&D Monitoring ECOOM, B-3000 Leuven, Belgium. [Wang, Jian] Univ Leuven, Dept Managerial Econ Strategy & Innovat, B-3000 Leuven, Belgium. [Wang, Jian] Inst Res Informat & Qual Assurance iFQ, D-10117 Berlin, Germany. [Hicks, Diana] Georgia Inst Technol, Sch Publ Policy, Atlanta, GA 30332 USA. RP Wang, J (reprint author), Waaistr 6,Bus 3536, B-3000 Leuven, Belgium. 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Informetr. PD JAN PY 2015 VL 9 IS 1 BP 197 EP 207 DI 10.1016/j.joi.2014.12.006 PG 11 WC Information Science & Library Science SC Information Science & Library Science GA CB6XO UT WOS:000349770500020 ER PT J AU Wong, CY Wang, LL AF Wong, Chan-Yuan Wang, Lili TI Trajectories of science and technology and their co-evolution in BRICS: Insights from publication and patent analysis SO JOURNAL OF INFORMETRICS LA English DT Article DE Science and technology; Publications; Patents; Logistic growth; Relative science impact index; BRICS ID EMERGING ECONOMIES; INNOVATION; PERFORMANCE; GROWTH; COUNTRIES; PATTERNS; POLICIES; PROGRESS; CHINA; PUSH AB By empirical demonstration, this study extends the assessments of BRICS countries (Brazil, Russia, India, China and South Africa) in performing science and technology in previous studies by exploring their cumulative patterns of science and technology (proxied by publications and patents respectively). Projections of cumulative production in science and technology are made using logistic growth function. Our analyses show that - though having different growth trajectories in science production - the BRICS countries exhibit similar patterns in pursuing technology. This embodies the strong commitment of BRICS to improve their technological capabilities in the process of industrial development. Inspired by the Relative Impact Index (RII) proposed by Nesta and Patel, we propose the Relative Science Impact Index (RSII) to evaluate the relative impact of science and technology on the process of technological catching-up in emerging economies and examine the co-evolution between science-based patents and patent citations. Our correlation analysis between forward citation and RSII marks some distinctive pursuits of BRICS countries in science-based patenting activities. (C) 2014 Elsevier Ltd. All rights reserved. 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Informetr. PD JAN PY 2015 VL 9 IS 1 BP 90 EP 101 DI 10.1016/j.joi.2014.11.006 PG 12 WC Information Science & Library Science SC Information Science & Library Science GA CB6XO UT WOS:000349770500011 ER PT J AU Wu, J AF Wu, Jiang TI Distributions of scientific funding across universities and research disciplines SO JOURNAL OF INFORMETRICS LA English DT Article DE Gini coefficient; NSFC; Distribution of scientific funding; Distribution fits; Inequality of funding allocation ID SCIENCE; IMPACT; PROJECT AB Distributing scientific funding to the suitable universities and research fields is very important to the innovation acceleration in science and technology. Using a longitudinal panel dataset of the National Natural Science Foundation of China (NSFC), the total 224,087 sponsored projects is utilized to investigate the distributions of scientific funding across universities and research disciplines. The inequality of funding distribution is studied through the investigation of Gini coefficient, and its fundamental rules are discovered through the technique of distribution fitting. It is found that the inequality of distributions of NSFC funding across 1971 universities is decreasing, and the distribution of funding and supported universities of 971 research fields follow Generalized Pareto distribution and Geometric distribution function, respectively. This study is dedicated to give an entire landscape to help make policy of distributing scientific funding. (C) 2015 Elsevier Ltd. All rights reserved. C1 [Wu, Jiang] Wuhan Univ, Sch Informat Management, Wuhan 430072, Hubei, Peoples R China. [Wu, Jiang] Chinese Acad Sci, Inst Automat, Beijing 100081, Peoples R China. RP Wu, J (reprint author), Wuhan Univ, Sch Informat Management, Wuhan 430072, Hubei, Peoples R China. 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PD JAN PY 2015 VL 9 IS 1 BP 183 EP 196 DI 10.1016/j.joi.2014.12.007 PG 14 WC Information Science & Library Science SC Information Science & Library Science GA CB6XO UT WOS:000349770500019 ER PT J AU Yang, SL Wang, FF AF Yang, Siluo Wang, Feifei TI Visualizing information science: Author direct citation analysis in China and around the world SO JOURNAL OF INFORMETRICS LA English DT Article DE Author direct citation; Information science; Citation network; Visualization ID BIBLIOGRAPHIC-COUPLING ANALYSIS; COCITATION ANALYSIS; RESEARCH-FRONT; NETWORKS; DOCUMENTS; LEVEL AB Author direct citation analysis (ADCA, also called inter-citation or cross citation) is a new feasible and applicable technique for exploring knowledge communication and discovering scientific structure. This study explored ADCA among prolific, highly cited, and core authors in information science in China and around the world. The results revealed the following. (1) The datasets in China and around the world cover overlapping, but also unique topics. Research subjects on information science around the world can be divided into three categories and 10 clusters; meanwhile, that in China can be divided into three categories and 9 clusters. Chinese scholars who are mostly involved in cross subjects and multi-fields are not as specialized and profound as foreign scholars. An obvious imbalance exists in the evolution of discipline structure around the world, indicating the necessity of a synchronous promotion of research specialty and cross comprehensiveness. Chinese scholars concentrate more on topics such as competitive intelligence, information resource management, and information retrieval, and they focus less on information security and user analysis. (2) Knowledge communication between active authors is stronger than the knowledge flow from highly influential authors to active authors around the world; meanwhile, Chinese researchers tend to adopt the knowledge of authoritative literature. The knowledge flow through bidirectional direct citation is related to mutual knowledge communication. Authoritative scholars are produced when prolific authors cite highly cited authors. The level of mutual recognition among Chinese scholars has not reached that among foreign scholars; in the former, less bidirectional flow of knowledge is involved, and unidirectional flow is limited to geographical proximity, cooperation, or teacher-student relationship. (3) In contrast to traditional author co-citation analysis (ACA), ADCA pays more attention to the mutual interaction among currently active scholars and to mainly showing the current research focus. (C) 2015 Elsevier Ltd. All rights reserved. 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PD JAN PY 2015 VL 9 IS 1 BP 208 EP 225 DI 10.1016/j.joi.2015.01.001 PG 18 WC Information Science & Library Science SC Information Science & Library Science GA CB6XO UT WOS:000349770500021 ER PT J AU Yu, Q Ding, Y Song, M Song, SJ Liu, JH Zhang, B AF Yu, Qi Ding, Ying Song, Min Song, Sungjeon Liu, Jianhua Zhang, Bin TI Tracing database usage: Detecting main paths in database link networks SO JOURNAL OF INFORMETRICS LA English DT Article DE Database link network; Main path; Bibliometrics; Bioinformatrics ID INFORMATION-SCIENCE; CITATION NETWORK; IMPACT; BIOINFORMATICS; RESOURCES; JOURNALS AB This paper presents a database link network to measure the impact of databases on biological research. To this end, we used the 20,861 full-text articles from PubMed Central in the field of Bioinformatics. We then extracted databases from the methodology sections of these articles and their references. The list of databases was built with The 2013 Nucleic Acids Research Molecular Biology Database Collection (available online), which includes 1512 databases. The database link network was constructed from sets of pairs of databases mentioned in the methodology sections of full-text PubMed Central articles. The edges of the database link network represent the link relationships between two databases. The weight of each edge is determined either by the link frequency of the two databases (i.e., in the link-weighted database link network) or the topic similarity between two databases (i.e., in the similarity-weighted database link network). With the database link network, we analyzed the topological structure and main paths of the database link network to trace the usage, connection, and evolution of databases. We also conducted content analysis by comparing content similarities among the papers citing databases. (C) 2014 Elsevier Ltd. All rights reserved. C1 [Yu, Qi] Shanxi Med Univ, Sch Management, Taiyuan 030001, Peoples R China. [Ding, Ying] Indiana Univ, Dept Informat & Lib Sci, Bloomington, IN USA. [Song, Min; Song, Sungjeon] Yonsei Univ, Dept Lib & Informat Sci, Seoul 120749, South Korea. [Liu, Jianhua] Chinese Acad Sci, Natl Sci Lib, Beijing, Peoples R China. [Zhang, Bin] Wuhan Univ, Ctr Studies Informat Resources, Wuhan 430072, Peoples R China. RP Yu, Q (reprint author), Shanxi Med Univ, Sch Management, 56 Xinjian South Rd, Taiyuan 030001, Peoples R China. 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PD JAN PY 2015 VL 9 IS 1 BP 1 EP 15 DI 10.1016/j.joi.2014.10.002 PG 15 WC Information Science & Library Science SC Information Science & Library Science GA CB6XO UT WOS:000349770500003 ER PT J AU Ahlgren, P Waltman, L AF Ahlgren, Per Waltman, Ludo TI The correlation between citation-based and expert-based assessments of publication channels: SNIP and SJR vs. Norwegian quality assessments SO JOURNAL OF INFORMETRICS LA English DT Article DE Citation impact; Field normalization; Norwegian model; RIP; SJR2; SNIP ID JOURNAL IMPACT FACTOR; FIELD-NORMALIZATION; INDICATOR; PERFORMANCE AB We study the correlation between citation-based and expert-based assessments of journals and series, which we collectively refer to as sources. The source normalized impact per paper (SNIP), the Scimago Journal Rank 2 (SJR2) and the raw impact per paper (RIP) indicators are used to assess sources based on their citations, while the Norwegian model is used to obtain expert-based source assessments. We first analyze - within different subject area categories and across such categories - the degree to which RIP, SNIP and SJR2 values correlate with the quality levels in the Norwegian model. We find that sources at higher quality levels on average have substantially higher RIP, SNIP, and SJR2 values. Regarding subject area categories, SNIP seems to perform substantially better than SJR2 from the field normalization point of view. We then compare the ability of RIP, SNIP and SJR2 to predict whether a source is classified at the highest quality level in the Norwegian model or not. SNIP and SJR2 turn out to give more accurate predictions than RIP, which provides evidence that normalizing for differences in citation practices between scientific fields indeed improves the accuracy of citation indicators. (C) 2014 Elsevier Ltd. All rights reserved. C1 [Ahlgren, Per] Stockholm Univ, Univ Lib, SE-10691 Stockholm, Sweden. [Waltman, Ludo] Leiden Univ, Ctr Sci & Technol Studies CWTS, NL-2300 AX Leiden, Netherlands. RP Ahlgren, P (reprint author), Stockholm Univ, Univ Lib, SE-10691 Stockholm, Sweden. 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Informetr. PD OCT PY 2014 VL 8 IS 4 BP 985 EP 996 DI 10.1016/j.joi.2014.09.010 PG 12 WC Information Science & Library Science SC Information Science & Library Science GA AU3QB UT WOS:000345527400018 ER PT J AU Birkmaier, D Wohlrabe, K AF Birkmaier, Daniel Wohlrabe, Klaus TI The Matthew effect in economics reconsidered SO JOURNAL OF INFORMETRICS LA English DT Article DE Matthew effect; Gibrat's law; Kolmogorov-Smirnov ID CITIES; LAW AB We apply the test of Ijiri and Simon (1974) to a large data set of authors in economics. This test has been used by Tol (2009, 2013a) to identify a (within-author) Matthew effect for authors based on citations. We show that the test is quite sensitive to its underlying assumptions and identifies too often a potential Matthew effect. We propose an alternative test based on the pure form of Gibrat's law. It states that stochastic proportionate citation growth, i.e. independent of its size, leads to a lognormal distribution. By using a one-sided Kolmogorov-Smirnov test we test for deviations from the lognormal distribution which we interpret as an indication of the Matthew effect. Using our large data set we also explore potential empirical characteristics of economists with a Matthew effect. (C) 2014 Elsevier Ltd. All rights reserved. C1 [Birkmaier, Daniel] Univ Munich, D-81679 Munich, Germany. [Wohlrabe, Klaus] Univ Munich, Ifo Inst Econ Res, D-81679 Munich, Germany. RP Wohlrabe, K (reprint author), Univ Munich, Ifo Inst Econ Res, Poschingerstr 5, D-81679 Munich, Germany. EM wohlrabe@ifo.de CR Eeckhout J, 2004, AM ECON REV, V94, P1429, DOI 10.1257/0002828043052303 Gabaix X., 2004, HDB REGIONAL URBAN E Gabaix X, 1999, Q J ECON, V114, P739, DOI 10.1162/003355399556133 Harzing AW, 2009, J AM SOC INF SCI TEC, V60, P41, DOI 10.1002/asi.20953 IJIRI Y, 1974, J POLIT ECON, V82, P315, DOI 10.1086/260194 MERTON RK, 1968, SCIENCE, V159, P56, DOI 10.1126/science.159.3810.56 Seiler C, 2012, J INFORMETR, V6, P389, DOI 10.1016/j.joi.2012.01.007 Tol R. S. J., 2013, WORKING PAPER SERIES, V5513 Tol RSJ, 2013, J INFORMETR, V7, P522, DOI 10.1016/j.joi.2013.02.001 Tol RSJ, 2009, J AM SOC INF SCI TEC, V60, P420, DOI 10.1002/asi.20968 Wang J, 2014, J INFORMETR, V8, P329, DOI 10.1016/j.joi.2014.01.006 NR 11 TC 0 Z9 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 1751-1577 EI 1875-5879 J9 J INFORMETR JI J. Informetr. PD OCT PY 2014 VL 8 IS 4 BP 880 EP 889 DI 10.1016/j.joi.2014.08.005 PG 10 WC Information Science & Library Science SC Information Science & Library Science GA AU3QB UT WOS:000345527400008 ER PT J AU Bornmann, L AF Bornmann, Lutz TI Do altmetrics point to the broader impact of research? An overview of benefits and disadvantages of altmetrics SO JOURNAL OF INFORMETRICS LA English DT Article DE Societal impact; Broader impact; Altmetrics; Scientometrics ID SOCIETAL IMPACT; SOCIAL MEDIA; CITATIONS; SCIENCE; METRICS; BIBLIOMETRICS; TWITTER; TWEETS; AGE AB Today, it is not clear how the impact of research on other areas of society than science should be measured. While peer review and bibliometrics have become standard methods for measuring the impact of research in science, there is not yet an accepted framework within which to measure societal impact. Alternative metrics (called altmetrics to distinguish them from bibliometrics) are considered an interesting option for assessing the societal impact of research, as they offer new ways to measure (public) engagement with research output. Altmetrics is a term to describe web-based metrics for the impact of publications and other scholarly material by using data from social media platforms (e. g. Twitter or Mendeley). This overview of studies explores the potential of altmetrics for measuring societal impact. It deals with the definition and classification of altmetrics. Furthermore, their benefits and disadvantages for measuring impact are discussed. (C) 2014 Elsevier Ltd. All rights reserved. C1 Adm Headquarters Max Planck Soc, Div Sci & Innovat Studies, D-80539 Munich, Germany. RP Bornmann, L (reprint author), Adm Headquarters Max Planck Soc, Div Sci & Innovat Studies, Hofgartenstr 8, D-80539 Munich, Germany. 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Y., 2013, CHINESE SCI BULL, P58, DOI [10.1007/s11434-013-5939-3, DOI 10.1007/S11434-013-5939-3] Zahedi Z, 2014, SCIENTOMETRICS, V101, P1491, DOI 10.1007/s11192-014-1264-0 NR 78 TC 0 Z9 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 1751-1577 EI 1875-5879 J9 J INFORMETR JI J. Informetr. PD OCT PY 2014 VL 8 IS 4 BP 895 EP 903 DI 10.1016/j.joi.2014.09.005 PG 9 WC Information Science & Library Science SC Information Science & Library Science GA AU3QB UT WOS:000345527400010 ER PT J AU Bornmann, L AF Bornmann, Lutz TI Validity of altmetrics data for measuring societal impact: A study using data from Altmetric and F1000Prime SO JOURNAL OF INFORMETRICS LA English DT Article DE Altmetrics; Bibliometrics; F1000; Twitter; Societal impact ID ADJUSTED PREDICTIONS AB Can altmetric data be validly used for the measurement of societal impact? The current study seeks to answer this question with a comprehensive dataset (about 100,000 records) from very disparate sources (F1000, Altmetric, and an in-house database based on Web of Science). In the F1000 peer review system, experts attach particular tags to scientific papers which indicate whether a paper could be of interest for science or rather for other segments of society. The results show that papers with the tag "good for teaching" do achieve higher altmetric counts than papers without this tag - if the quality of the papers is controlled. At the same time, a higher citation count is shown especially by papers with a tag that is specifically scientifically oriented ("new finding"). The findings indicate that papers tailored for a readership outside the area of research should lead to societal impact. If altmetric data is to be used for the measurement of societal impact, the question arises of its normalization. In bibliometrics, citations are normalized for the papers' subject area and publication year. This study has taken a second analytic step involving a possible normalization of altmetric data. As the results show there are particular scientific topics which are of especial interest for a wide audience. Since these more or less interesting topics are not completely reflected in Thomson Reuters' journal sets, a normalization of altmetric data should not be based on the level of subject categories, but on the level of topics. (C) 2014 Elsevier Ltd. All rights reserved. C1 Adm Headquarters Max Planck Soc, Div Sci & Innovat Studies, D-80539 Munich, Germany. RP Bornmann, L (reprint author), Adm Headquarters Max Planck Soc, Div Sci & Innovat Studies, D-80539 Munich, Germany. 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P., 2013, LOOK ALTMETRICS ITS StataCorp, 2013, STATA STATISTICAL SO Torres-Salinas D, 2013, COMUNICAR, P53, DOI 10.3916/C41-2013-05 Vinkler P., 2010, THE EVALUATION OF RE Waltman L, 2014, J ASSOC INF SCI TECH, V65, P433, DOI 10.1002/asi.23040 Wang J, 2013, SCIENTOMETRICS, V94, P851, DOI 10.1007/s11192-012-0775-9 Wets K, 2003, LEARN PUBL, V16, P249, DOI 10.1087/095315103322421982 Williams R, 2012, STATA J, V12, P308 Williams R., 2014, MEASURING SCHOLARLY Wouters P., 2012, USERS NARCISSISM AND Zubiaga A., 2014, JOURNAL OF THE ASSOC NR 40 TC 0 Z9 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 1751-1577 EI 1875-5879 J9 J INFORMETR JI J. Informetr. PD OCT PY 2014 VL 8 IS 4 BP 935 EP 950 DI 10.1016/j.joi.2014.09.007 PG 16 WC Information Science & Library Science SC Information Science & Library Science GA AU3QB UT WOS:000345527400014 ER PT J AU Chuang, KY Ho, YS AF Chuang, Kun-Yang Ho, Yuh-Shan TI Bibliometric profile of top-cited single-author articles in the Science Citation Index Expanded SO JOURNAL OF INFORMETRICS LA English DT Article DE Web of science; SCI-EXPANDED; Bibliometric; Top-cited publication; Citations; Single-author articles ID EQUAL CONTRIBUTIONS; JOURNALS; CREDIT; ELECTROPHORESIS; SCIENTISTS; PROTEINS; CRITERIA; GROWTH; PERIOD; ORDER AB In this study, we identified and analyzed characteristics of top-cited single-author articles published in the Science Citation Index Expanded from 1991 to 2010. A top-cited single-author article was defined as an article that had been cited at least 1000 times from the time of its publication to 2012. Results showed that 1760 top-cited single-author articles were published in 539 journals listed in 130 Web of Science categories between 1901 and 2010. The top productive journal was Science and the most productive category was multidisciplinary physics. Most of the articles were not published in high-impact journals. Harvard University led all other institutions in publishing top-cited single-author articles. Nobel Prize winners contributed 7.0% of articles. In total, 72 Nobel Prize winners published 124 single-author articles. Single-authored papers published in different periods exhibited different patterns of citation trends. However, top-cited articles consistently showed repetitive peaks regardless of the time period of publication. "Theory (or theories)" was the most frequently appeared title word of all time. Leading title words varied at different time periods, and only five title words, method(s), protein(s), structure(s), molecular, and quantum consistently remained in the top 20 in different time periods. (C) 2014 Elsevier Ltd. All rights reserved. C1 [Chuang, Kun-Yang] Taipei Med Univ, Sch Publ Hlth, Taipei 11014, Taiwan. [Ho, Yuh-Shan] Asia Univ, Trend Res Ctr, Wufeng 41354, Taichung County, Taiwan. RP Ho, YS (reprint author), Asia Univ, Trend Res Ctr, 500 Lioufeng Rd, Wufeng 41354, Taichung County, Taiwan. 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Informetr. PD OCT PY 2014 VL 8 IS 4 BP 951 EP 962 DI 10.1016/j.joi.2014.09.008 PG 12 WC Information Science & Library Science SC Information Science & Library Science GA AU3QB UT WOS:000345527400015 ER PT J AU Lachance, C Lariviere, V AF Lachance, Christian Lariviere, Vincent TI On the citation lifecycle of papers with delayed recognition SO JOURNAL OF INFORMETRICS LA English DT Article DE Delayed recognition; Sleeping beauties; Citation lifecycle ID SLEEPING-BEAUTIES; SCIENTIFIC LITERATURE; SCIENCE; DURABILITY; HUMANITIES AB Delayed recognition is a concept applied to articles that receive very few to no citations for a certain period of time following publication, before becoming actively cited. To determine whether such a time spent in relative obscurity had an effect on subsequent citation patterns, we selected articles that received no citations before the passage of ten full years since publication, investigated the subsequent yearly citations received over a period of 37 years and compared them with the citations received by a group of papers without such a latency period. Our study finds that papers with delayed recognition do not exhibit the typical early peak, then slow decline in citations, but that the vast majority enter decline immediately after their first - and often only - citation. Middling papers' citations remain stable over their lifetime, whereas the more highly cited papers, some of which fall into the "sleeping beauty" subtype, show non-stop growth in citations received. Finally, papers published in different disciplines exhibit similar behavior and did not differ significantly. (C) 2014 Elsevier Ltd. All rights reserved. C1 [Lachance, Christian; Lariviere, Vincent] Univ Montreal, Ecole Bibliothecon & Sci Informat, Montreal, PQ H3C 3J7, Canada. [Lariviere, Vincent] Univ Quebec, CIRST, OST, Montreal, PQ H3C 3P8, Canada. RP Lachance, C (reprint author), Univ Montreal, Ecole Bibliothecon & Sci Informat, CP 6128,Succ Ctr Ville, Montreal, PQ H3C 3J7, Canada. 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Informetr. PD OCT PY 2014 VL 8 IS 4 BP 863 EP 872 DI 10.1016/j.joi.2014.08.002 PG 10 WC Information Science & Library Science SC Information Science & Library Science GA AU3QB UT WOS:000345527400006 ER PT J AU Li, J Qiao, L Li, WYZ Jin, YD AF Li, Jiang Qiao, Lili Li, Wenyuze Jin, Yidan TI Chinese-language articles are not biased in citations: Evidences from Chinese-English bilingual journals in Scopus and Web of Science SO JOURNAL OF INFORMETRICS LA English DT Article DE Language bias; Chinese-language article; Chinese-English bilingual journal; Knowledge diffusion; Scopus; Web of Science ID INTERNATIONAL VISIBILITY; PUBLICATIONS; SAMPLE; TWINS AB This paper examined the citation impact of Chinese- and English-language articles in Chinese-English bilingual journals indexed by Scopus and Web of Science (WoS). Two findings were obtained from comparative analysis: (1) Chinese-language articles were not biased in citations compared with English-language articles, since they received a large number of citations from Chinese scientists; (2) a Chinese-language community was found in Scopus, in which Chinese-language articles mainly received citations from Chinese-language articles, but it was not found in WoS whose coverage of Chinese-language articles is only one-tenth of Scopus. The findings suggest some implications for academic evaluation of journals including Chinese-language articles in Scopus and WoS. (C) 2014 Elsevier Ltd. All rights reserved. C1 [Li, Jiang; Qiao, Lili; Li, Wenyuze; Jin, Yidan] Zhejiang Univ, Dept Informat Resource Management, Hangzhou 310058, Zhejiang, Peoples R China. RP Li, J (reprint author), Zhejiang Univ, Dept Informat Resource Management, Hangzhou 310058, Zhejiang, Peoples R China. 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Informetr. PD OCT PY 2014 VL 8 IS 4 BP 912 EP 916 DI 10.1016/j.joi.2014.09.003 PG 5 WC Information Science & Library Science SC Information Science & Library Science GA AU3QB UT WOS:000345527400012 ER PT J AU Mingers, J AF Mingers, John TI Problems with the SNIP indicator SO JOURNAL OF INFORMETRICS LA English DT Letter ID JOURNAL IMPACT FACTOR; CITATION ANALYSIS; TOOL C1 Univ Kent, Kent Business Sch, Canterbury CT2 7PE, Kent, England. RP Mingers, J (reprint author), Univ Kent, Kent Business Sch, Canterbury CT2 7PE, Kent, England. 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PD OCT PY 2014 VL 8 IS 4 BP 890 EP 894 DI 10.1016/j.joi.2014.09.004 PG 5 WC Information Science & Library Science SC Information Science & Library Science GA AU3QB UT WOS:000345527400009 ER PT J AU Sangwal, K AF Sangwal, Keshra TI Distributions of citations of papers of individual authors publishing in different scientific disciplines: Application of Langmuir-type function SO JOURNAL OF INFORMETRICS LA English DT Article DE Citation analysis; Citation distribution; Langmuir-type function ID RANK-ORDER DISTRIBUTION; ICEBERG HYPOTHESIS; RESEARCH OUTPUT; H-INDEX; IMPACT; LAW; UNIVERSALITY; STATISTICS; NETWORKS; BEHAVIOR AB The distribution of cumulative citations L and contributed citations L-f to individual multi-authored papers published by selected authors working in different scientific disciplinesis analyzed and discussed using Langmuir-type function: y(n)=y(0)[1-alpha Kn/(1 + Kn)], where y(n)-denotes the total number of normalized cumulative citations l(n)* and normalized contributed citations l(nf)* received by individual papers of rank n, y(0) is the maximum value of y(n) when n = 0, alpha >= 1 is an effectiveness parameter, and K is the Langmuir constant related to the dimensionless differential energy Q = ln(KNc), with N-c as the number of papers receiving citations. Relationships between the values of the Langmuir constant K of the distribution function, the number N-c of papers of an individual author receiving citations and the effectiveness parameter alpha of this function, obtained from analysis of the data of rank size distributions of the authors, are investigated. It was found that: (1) the quantity KNc obtained from the real citation distribution of papers of various authors working in different disciplines is inversely proportional to (alpha-1) with a proportional constant (KNc)(0)< 1, (2) the relation KNc=(KNc)(0)/(alpha-1) also holds for the citation distribution of journals published in countries of two different groups, investigated earlier (Sangwal, K. (2013). Journal of Informetrics, 7, 487-504), and (3) deviations of the real citation distribution from curves predicted by the Langmuir-type function are associated with changing activity of sources of generation of items (citations). (C) 2014 Elsevier Ltd. All rights reserved. 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Informetr. PD OCT PY 2014 VL 8 IS 4 BP 972 EP 984 DI 10.1016/j.joi.2014.09.009 PG 13 WC Information Science & Library Science SC Information Science & Library Science GA AU3QB UT WOS:000345527400017 ER PT J AU Schreiber, M AF Schreiber, Michael TI How to improve the outcome of performance evaluations in terms of percentiles for citation frequencies of my papers SO JOURNAL OF INFORMETRICS LA English DT Article DE Evaluation; Percentiles; Citation analysis; Bibliometric rankings ID HIRSCH INDEX; IMPACT INDICATORS; EXCELLENCE; RANKS; P100 AB Using empirical data I demonstrate that the result of performance evaluations by percentiles can be drastically influenced by the proper choice of the journal in which a manuscript is published. (C) 2014 Elsevier Ltd. All rights reserved. C1 Tech Univ Chemnitz, Inst Phys, D-09107 Chemnitz, Germany. RP Schreiber, M (reprint author), Tech Univ Chemnitz, Inst Phys, D-09107 Chemnitz, Germany. 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Informetr. PD OCT PY 2014 VL 8 IS 4 BP 873 EP 879 DI 10.1016/j.joi.2014.09.002 PG 7 WC Information Science & Library Science SC Information Science & Library Science GA AU3QB UT WOS:000345527400007 ER PT J AU Seiler, C Wohlrabe, K AF Seiler, Christian Wohlrabe, Klaus TI How robust are journal rankings based on the impact factor? Evidence from the economic sciences SO JOURNAL OF INFORMETRICS LA English DT Article DE Impact factor; Ranking; Skewness; Economics journals ID RELIABILITY AB It is well-known that the distribution of citations to articles in a journal is skewed. We ask whether journal rankings based on the impact factor are robust with respect to this fact. We exclude the most cited paper, the top 5 and 10 cited papers for 100 economics journals and recalculate the impact factor. Afterwards we compare the resulting rankings with the original ones from 2012. Our results show that the rankings are relatively robust. This holds both for the 2-year and the 5-year impact factor. (C) 2014 Elsevier Ltd. All rights reserved. C1 [Seiler, Christian; Wohlrabe, Klaus] Univ Munich, Ifo Inst Econ Res, D-81679 Munich, Germany. RP Seiler, C (reprint author), Univ Munich, Ifo Inst Econ Res, Poschingerstr 5, D-81679 Munich, Germany. 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Informetr. PD OCT PY 2014 VL 8 IS 4 BP 904 EP 911 DI 10.1016/j.joi.2014.09.001 PG 8 WC Information Science & Library Science SC Information Science & Library Science GA AU3QB UT WOS:000345527400011 ER PT J AU Thelwall, M Wilson, P AF Thelwall, Mike Wilson, Paul TI Regression for citation data: An evaluation of different methods SO JOURNAL OF INFORMETRICS LA English DT Article DE Informetrics; Altmetrics; Citation distributions; Lognormal; Powerlaw; Regression ID INTERNATIONAL COLLABORATION; SELF-CITATION; IMPACT; ARTICLES; DISTRIBUTIONS; METRICS; COUNTS; NUMBER; CLASSIFICATION; DETERMINANTS AB Citations are increasingly used for research evaluations. It is therefore important to identify factors affecting citation scores that are unrelated to scholarly quality or usefulness so that these can be taken into account. Regression is the most powerful statistical technique to identify these factors and hence it is important to identify the best regression strategy for citation data. Citation counts tend to follow a discrete lognormal distribution and, in the absence of alternatives, have been investigated with negative binomial regression. Using simulated discrete lognormal data (continuous lognormal data rounded to the nearest integer) this article shows that a better strategy is to add one to the citations, take their log and then use the general linear (ordinary least squares) model for regression (e. g., multiple linear regression, ANOVA), or to use the generalised linear model without the log. Reasonable results can also be obtained if all the zero citations are discarded, the log is taken of the remaining citation counts and then the general linear model is used, or if the generalised linear model is used with the continuous lognormal distribution. Similar approaches are recommended for altmetric data, if it proves to be lognormally distributed. (C) 2014 Elsevier Ltd. All rights reserved. C1 [Thelwall, Mike; Wilson, Paul] Wolverhampton Univ, Sch Math & Comp Sci, Stat Cybermetr Res Grp, Wolverhampton WV1 1LY, W Midlands, England. RP Thelwall, M (reprint author), Wolverhampton Univ, Sch Math & Comp Sci, Stat Cybermetr Res Grp, Wulfruna St, Wolverhampton WV1 1LY, W Midlands, England. EM m.thelwall@wlv.ac.uk; PaulJWilson@wlv.ac.uk CR Abramo G, 2013, SCIENTOMETRICS, V95, P311, DOI 10.1007/s11192-012-0875-6 Abramo G, 2011, SCIENTOMETRICS, V89, P929, DOI 10.1007/s11192-011-0459-x ACUMEN, 2014, GUID GOOD EV PRACT A Adie E, 2013, LEARN PUBL, V26, P11, DOI 10.1087/20130103 AITCHISON J, 1989, BIOMETRIKA, V76, P643 Aksnes DW, 2013, RES EVALUAT, V22, P215, DOI 10.1093/reseval/rvt012 Aksnes DW, 2003, RES EVALUAT, V12, P159, DOI 10.3152/147154403781776645 Almind TC, 1997, J DOC, V53, P404, DOI 10.1108/EUM0000000007205 Anderson D. 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PD OCT PY 2014 VL 8 IS 4 BP 963 EP 971 DI 10.1016/j.joi.2014.09.011 PG 9 WC Information Science & Library Science SC Information Science & Library Science GA AU3QB UT WOS:000345527400016 ER PT J AU van den Besselaar, P Bornmann, L Leydesdorff, L AF van den Besselaar, Peter Bornmann, Lutz Leydesdorff, Loet TI Untitled SO JOURNAL OF INFORMETRICS LA English DT Letter ID SELECTION RI Bornmann, Lutz/A-3926-2008; van den Besselaar, Peter/E-5938-2013 OI Bornmann, Lutz/0000-0003-0810-7091; van den Besselaar, Peter/0000-0002-8304-8565 CR Bornmann L, 2010, J INFORMETR, V4, P211, DOI 10.1016/j.joi.2009.10.004 Bornmann L, 2008, PLOS ONE, V3, DOI 10.1371/journal.pone.0003480 van den Besselaar P., 2007, PAST PERFORMANCE AS van den Besselaar P., INVESTIGATING THE QU van den Besselaar P., 2013, P 18 STI BERL, P385 van den Besselaar P, 2009, RES EVALUAT, V18, P273, DOI 10.3152/095820209X475360 NR 6 TC 0 Z9 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 1751-1577 EI 1875-5879 J9 J INFORMETR JI J. Informetr. PD OCT PY 2014 VL 8 IS 4 BP 801 EP 801 DI 10.1016/j.joi.2014.07.008 PG 1 WC Information Science & Library Science SC Information Science & Library Science GA AU3QB UT WOS:000345527400001 ER PT J AU van Eck, NJ Waltman, L AF van Eck, Nees Jan Waltman, Ludo TI CitNetExplorer: A new software tool for analyzing and visualizing citation networks SO JOURNAL OF INFORMETRICS LA English DT Article DE Citation network; CitNetExplorer; Computer software; Network analysis; Visualization ID TRAJECTORIES; KNOWLEDGE; ALGORITHM; SCIENCE AB We present CitNetExplorer, a new software tool for analyzing and visualizing citation networks of scientific publications. CitNetExplorer can for instance be used to study the development of a research field, to delineate the literature on a research topic, and to support literature reviewing. We first introduce the main concepts that need to be understood when working with CitNetExplorer. We then demonstrate CitNetExplorer by using the tool to analyze the scientometric literature and the literature on community detection in networks. Finally, we discuss some technical details on the construction, visualization, and analysis of citation networks in CitNetExplorer. (C) 2014 Elsevier Ltd. All rights reserved. C1 [van Eck, Nees Jan; Waltman, Ludo] Leiden Univ, Ctr Sci & Technol Studies, NL-2300 RA Leiden, Netherlands. RP van Eck, NJ (reprint author), Leiden Univ, Ctr Sci & Technol Studies, NL-2300 RA Leiden, Netherlands. EM ecknjpvan@cwts.leidenuniv.nl; waltmanlr@cwts.leidenuniv.nl RI Golwal, Madansing/A-1097-2015 CR Barbera-Tomas D., 2011, RES POLICY, V40, P473, DOI 10.1016/j.respol.2010.11.002 Blondel VD, 2008, J STAT MECH-THEORY E, DOI 10.1088/1742-5468/2008/10/P10008 Borner K., 2010, ATLAS OF SCIENCE VIS CAWKELL AE, 1974, J AM SOC INFORM SCI, V25, P123, DOI 10.1002/asi.4630250208 Clough J. 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PD OCT PY 2014 VL 8 IS 4 BP 802 EP 823 DI 10.1016/j.joi.2014.07.006 PG 22 WC Information Science & Library Science SC Information Science & Library Science GA AU3QB UT WOS:000345527400002 ER PT J AU Wang, XF Huang, M Wang, HY Lei, M Zhu, DH Ren, J Jabeen, M AF Wang, Xuefeng Huang, Meng Wang, Hongyuan Lei, Ming Zhu, Donghua Ren, Jie Jabeen, Munazza TI International Collaboration Activity Index: Case study of dye-sensitized solar cells SO JOURNAL OF INFORMETRICS LA English DT Article DE International Collaboration Activity Index; Dye-sensitized solar cells; Cluster analysis; International collaboration network; Inter-country collaboration; Intra-continent collaboration ID SCIENTIFIC COLLABORATION; RESEARCH PRODUCTIVITY; PUBLICATION; AUTHORSHIP; PATTERNS; CREDIT; INDICATORS AB International scientific collaboration has been the dominant driving force for promoting scientific and technological advancement. However, current international scientific collaboration analysis and evaluation mainly concentrate on the exploration of international collaboration network; hence, an evaluation method of international scientific collaboration is yet to be formed. In this paper, we take the dye-sensitized solar cells (DSSCs) as an empirical object and combine the international collaboration network with geographic information, which we call the International Collaboration Map, to display the international collaboration situations among countries or regions worldwide (inter-country collaboration), the collaborations among countries or regions within each continent (intra-continent collaboration), and the collaborations among continents (inter-continent collaboration) from different angles. Based on the thought of fractional count, this study introduces the indicators of collaborative country rank, international collaboration width, and international collaboration activity; the study employs the International Collaboration Activity Index (ICAI) to comprehensively measure the degree of countries or regions international collaboration at the country or region level. It systematically evaluates the differences between the active degree of relevant countries or regions in collaborative research. We use correlation analysis among the five sub-criterions and verify the rationality of index construction. K-means clustering analysis is undertaken among 84 countries or regions in the DSSCs field. The results show the formation of three groups, each with their unique international collaboration features. (C) 2014 Elsevier Ltd. All rights reserved. C1 [Wang, Xuefeng; Huang, Meng; Wang, Hongyuan; Zhu, Donghua; Ren, Jie; Jabeen, Munazza] Beijing Inst Technol, Sch Management & Econ, Beijing, Peoples R China. [Lei, Ming] Beijing Inst Technol, Sch Comp Sci & Technol, Beijing, Peoples R China. RP Wang, XF (reprint author), Beijing Inst Technol, Sch Management & Econ, Beijing, Peoples R China. 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PD OCT PY 2014 VL 8 IS 4 BP 854 EP 862 DI 10.1016/j.joi.2014.08.004 PG 9 WC Information Science & Library Science SC Information Science & Library Science GA AU3QB UT WOS:000345527400005 ER PT J AU Wolfram, D Zhao, YH AF Wolfram, Dietmar Zhao, Yuehua TI A comparison of journal similarity across six disciplines using citing discipline analysis SO JOURNAL OF INFORMETRICS LA English DT Article DE Journal similarity; Citer analysis; Citation analysis; Citing discipline analysis ID PEARSONS CORRELATION-COEFFICIENT; COCITATION ANALYSIS; INFORMATION-SCIENCE; SCIENTIFIC JOURNALS; CITATION; INTERDISCIPLINARITY; CATEGORIES; MAPS AB A similarity comparison is made between 120 journals from five allied Web of Science disciplines (Communication, Computer Science-Information Systems, Education & Educational Research, Information Science & Library Science, Management) and a more distant discipline (Geology) across three time periods using a novel method called citing discipline analysis that relies on the frequency distribution of Web of Science Research Areas for citing articles. Similarities among journals are evaluated using multidimensional scaling with hierarchical cluster analysis and Principal Component Analysis. The resulting visualizations and groupings reveal clusters that align with the discipline assignments for the journals for four of the six disciplines, but also greater overlaps among some journals for two of the disciplines or categorizations that do not necessarily align with their assigned disciplines. Some journals categorized into a single given discipline were found to be more closely aligned with other disciplines and some journals assigned to multiple disciplines more closely aligned with only one of the assigned disciplines. The proposed method offers a complementary way to more traditional methods such as journal co-citation analysis to compare journal similarity using data that are readily available through Web of Science. (C) 2014 Elsevier Ltd. All rights reserved. C1 [Wolfram, Dietmar; Zhao, Yuehua] Univ Wisconsin, Sch Informat Studies, Milwaukee, WI 53201 USA. RP Wolfram, D (reprint author), Univ Wisconsin, Sch Informat Studies, POB 413, Milwaukee, WI 53201 USA. 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Informetr. PD OCT PY 2014 VL 8 IS 4 BP 840 EP 853 DI 10.1016/j.joi.2014.08.003 PG 14 WC Information Science & Library Science SC Information Science & Library Science GA AU3QB UT WOS:000345527400004 ER PT J AU Bongioanni, I Daraio, C Ruocco, G AF Bongioanni, Irene Daraio, Cinzia Ruocco, Giancarlo TI A quantitative measure to compare the disciplinary profiles of research systems and their evolution over time SO JOURNAL OF INFORMETRICS LA English DT Article DE Diversity/similarity; Disciplinary profiles; Spin glasses; Overlap; Overlap distribution; European science ID SPIN-GLASS PHASE; SCIENCE AB By modeling research systems as complex systems we generalize similarity measures used in the literature during the last two decades. We propose to use the mathematical tools developed within the spin-glasses literature to evaluate similarity within systems and between systems in a unified manner. Our measure is based on the 'overlap' of disciplinary profiles of a set of research systems and can readily be integrated in the framework of traditional bibliometric profile analysis. The investigation of the distribution of the overlaps provides useful insights on the dynamics of the general system, that is whether it converges toward a unique disciplinary structure or to a differentiated pattern. We illustrate the usefulness of the approach by investigating the dynamics of disciplinary profiles of European countries from 1996 to 2011. We analyze several bibliometric indicators (including publications and citations) of European countries in the 27 Scopus subject categories. We compare the disciplinary profiles of European countries (i) among them; (ii) with respect to the European standard; and (iii) to the World reference. We find that there is a convergence toward a unique European disciplinary profile of the scientific production even if large differences in the scientific profiles still remain. The investigation of the dynamics by year shows that developing countries are converging toward the European model while some developed countries are departing from it. (C) 2014 Elsevier Ltd. All rights reserved. C1 [Bongioanni, Irene; Ruocco, Giancarlo] Univ Roma La Sapienza, Dept Phys, I-00185 Rome, Italy. [Daraio, Cinzia] Univ Roma La Sapienza, Dept Comp Control & Management Engn Antonio Ruber, I-00185 Rome, Italy. [Ruocco, Giancarlo] Univ Roma La Sapienza, Ctr Life NanoSci LaSapienza, IIT, I-00185 Rome, Italy. RP Daraio, C (reprint author), Univ Roma La Sapienza, Dept Comp Control & Management Engn Antonio Ruber, Via Ariosto 25, I-00185 Rome, Italy. 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L., 2013, SPIN GLASSES AND COM Stirling A, 2007, J R SOC INTERFACE, V4, P707, DOI 10.1098/rsif.2007.0213 Tian YG, 2008, J INFORMETR, V2, P65, DOI 10.1016/j.joi.2007.10.001 van Raan AFJ, 2004, HANDBOOK OF QUANTITATIVE SCIENCE AND TECHNOLOGY RESEARCH: THE USE OF PUBLICATION AND PATENT STATISTICS IN STUDIES OF S&T SYSTEMS, P19 Zhou QJ, 2012, SCIENTOMETRICS, V93, P787, DOI 10.1007/s11192-012-0767-9 Zuccala A, 2006, J AM SOC INF SCI TEC, V57, P152, DOI 10.1002/asi.20256 NR 22 TC 0 Z9 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 1751-1577 EI 1875-5879 J9 J INFORMETR JI J. Informetr. PD JUL PY 2014 VL 8 IS 3 BP 710 EP 727 DI 10.1016/j.joi.2014.06.006 PG 18 WC Information Science & Library Science SC Information Science & Library Science GA AO5IE UT WOS:000341376700023 ER PT J AU Boyack, KW Klavans, R AF Boyack, Kevin W. Klavans, Richard TI Including cited non-source items in a large-scale map of science: What difference does it make? SO JOURNAL OF INFORMETRICS LA English DT Article DE Science mapping; Direct citation; Non-source documents; Books ID SCIENTIFIC LITERATURE; SOCIAL-SCIENCES; COCITATION; EXPLORATION; PERSPECTIVE; INDICATORS; HUMANITIES; OUTPUT AB Cited non-source documents such as articles from regional journals, conference papers, books and book chapters, working papers and reports have begun to attract more attention in the literature. Most of this attention has been directed at understanding the effects of including non-source items in research evaluation. In contrast, little work has been done to examine the effects of including non-source items on science maps and on the structure of science as reflected by those maps. In this study we compare two direct citation maps of a 16-year set of Scopus documents - one that includes only source documents, and one that includes non-source documents along with the source documents. In addition to more than doubling the contents of the map, from 19 M to 43 M documents, the inclusion of non-source items strongly augments the social sciences relative to the natural sciences and medicine and makes their position in the map more central. Books are also found to play a significant role in the map, and are much more highly cited on average than articles. (C) 2014 Elsevier Ltd. All rights reserved. C1 [Boyack, Kevin W.] SciTech Strategies Inc, Albuquerque, NM 87122 USA. [Klavans, Richard] SciTech Strategies Inc, Berwyn, PA 19312 USA. RP Boyack, KW (reprint author), SciTech Strategies Inc, Albuquerque, NM 87122 USA. 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Informetr. PD JUL PY 2014 VL 8 IS 3 BP 569 EP 580 DI 10.1016/j.joi.2014.04.001 PG 12 WC Information Science & Library Science SC Information Science & Library Science GA AO5IE UT WOS:000341376700011 ER PT J AU Franceschini, F Maisano, D AF Franceschini, Fiorenzo Maisano, Domenico TI Sub-field normalization of the IEEE scientific journals based on their connection with Technical Societies SO JOURNAL OF INFORMETRICS LA English DT Article DE Journal ranking; IEEE journal; Propensity to cite; Sub-field normalization; IEEE Society ID RESEARCH PERFORMANCE; IMPACT FACTOR; CITATIONS; INDICATORS AB A recent paper (Canavero et al., 2014. Journal of the American Society for Information Science and Technology, doi:10.1109/TPC.2013.2255935) performed a bibliometric analysis of an extensive set of scientific journals within the Engineering field, published by IEEE (Institute of Electrical and Electronics Engineers). The analysis was based on (i) the citation impact of journal articles and (ii) the reputation of journal authors in terms of total scientific production and relevant citation impact. The goal of this paper is to complement the prior analysis, investigating on the different citation cultures of these journals, depending on the sub-field/specialty of interest. To perform this evaluation, it is suggested a novel technique, which takes into account the connections between journals and some highly specialized communities of scientists, known as IEEE Technical Societies and Councils. After showing significant differences in terms of propensity to cite, probably attributable to the large variety of sub-fields and specialties covered by IEEE journals, it is presented a simplified technique for the sub-field normalization of the results of the prior study. 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PD JUL PY 2014 VL 8 IS 3 BP 508 EP 533 DI 10.1016/j.joi.2014.04.005 PG 26 WC Information Science & Library Science SC Information Science & Library Science GA AO5IE UT WOS:000341376700007 ER PT J AU Jeong, DH Song, M AF Jeong, Do-Heon Song, Min TI Time gap analysis by the topic model-based temporal technique SO JOURNAL OF INFORMETRICS LA English DT Article DE Text mining; Topic modeling; Latent Dirichlet Allocation (LDA); Content analysis; Temporal analysis; Multiple resources ID LATENT DIRICHLET ALLOCATION; BIBLIOMETRIC ANALYSIS; SCIENCE; INNOVATION; FIELD AB This study proposes a temporal analysis method to utilize heterogeneous resources such as papers, patents, and web news articles in an integrated manner. We analyzed the time gap phenomena between three resources and two academic areas by conducting text mining-based content analysis. To this end, a topic modeling technique, Latent Dirichlet Allocation (LDA) was used to estimate the optimal time gaps among three resources (papers, patents, and web news articles) in two research domains. The contributions of this study are summarized as follows: firstly, we propose a new temporal analysis method to understand the content characteristics and trends of heterogeneous multiple resources in an integrated manner. We applied it to measure the exact time intervals between academic areas by understanding the time gap phenomena. The results of temporal analysis showed that the resources of the medical field had more up-to-date property than those of the computer field, and thus prompter disclosure to the public. Secondly, we adopted a power-law exponent measurement and content analysis to evaluate the proposed method. With the proposed method, we demonstrate how to analyze heterogeneous resources more precisely and comprehensively. (C) 2014 Elsevier Ltd. All rights reserved. C1 [Jeong, Do-Heon] KISTI, Taejon 305806, South Korea. [Song, Min] Yonsei Univ, Seoul 120749, South Korea. RP Song, M (reprint author), Yonsei Univ, 50 Yonsei Ro, Seoul 120749, South Korea. EM heon@kisti.re.kr; min.song@yonsei.ac.kr CR AMITAY E, 2004, AM SOC INFORM SCI TE, V55, P1270 Ball R, 2006, SCIENTOMETRICS, V66, P561, DOI 10.1007/s11192-006-0041-0 Bjorneborn L, 2004, J AM SOC INF SCI TEC, V55, P1216, DOI 10.1002/asi.20077 Blei D. 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Informetr. PD JUL PY 2014 VL 8 IS 3 BP 776 EP 790 DI 10.1016/j.joi.2014.07.005 PG 15 WC Information Science & Library Science SC Information Science & Library Science GA AO5IE UT WOS:000341376700029 ER PT J AU Li, YL Wu, C Wang, XY Luo, P AF Li, Yongli Wu, Chong Wang, Xiaoyu Luo, Peng TI A network-based and multi-parameter model for finding influential authors SO JOURNAL OF INFORMETRICS LA English DT Article DE Author's influence; Network analysis; Coauthor network; Multi parameter model; Simulation; Evaluation techniques for scientific output ID SCIENTIFIC FIELDS; CENTRALITY; COLLABORATION; INDEX; BETWEENNESS; COUNTRY; GRAPH AB This study proposes a network-based model with two parameters to find influential authors based on the idea that the prestige of a whole network changes when a node is removed. We apply the Katz-Bonacich centrality to define network prestige, which agrees with the idea behind the PageRank algorithm. We further deduce a concise mathematical formula to calculate each author's influence score to find the influential ones. Furthermore, the functions of two parameters are revealed by the analysis of simulation and the test on the real-world data. Parameter alpha provides useful information exogenous to the established network, and parameter beta measures the robustness of the result for cases in which the incompleteness of the network is considered. On the basis of the coauthor network of Paul Erdos, a comprehensive application of this new model is also provided. (C) 2014 Elsevier Ltd. All rights reserved. C1 [Li, Yongli; Wu, Chong; Luo, Peng] Harbin Inst Technol, Sch Management, Harbin 150001, Peoples R China. [Li, Yongli] Univ Siena, Dipartimento Econ Polit & Stat, I-53100 Siena, Italy. [Wang, Xiaoyu] Harbin Inst Technol, Sch Software, Harbin 150001, Peoples R China. RP Li, YL (reprint author), Harbin Inst Technol, Sch Management, Harbin 150001, Peoples R China. 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PD JUL PY 2014 VL 8 IS 3 BP 791 EP 799 DI 10.1016/j.joi.2014.07.007 PG 9 WC Information Science & Library Science SC Information Science & Library Science GA AO5IE UT WOS:000341376700030 ER PT J AU Liu, Y Yang, YL AF Liu, Yu Yang, Yongliang TI Empirical study of L-Sequence: The basic h-index sequence for cumulative publications with consideration of the yearly citation performance SO JOURNAL OF INFORMETRICS LA English DT Article DE Bibliometrics; Citations; Research evaluation; H-index sequence AB Most current h-type indicators use only a single number to measure a scientist's productivity and impact of his/her published works. Although a single number is simple to calculate, it fails to outline his/her academic performance varying with time. We empirically study the basic h-index sequence for cumulative publications with consideration of the yearly citation performance (for convenience, referred as L-Sequence). L-Sequence consists of a series of L factors. Based on the citations received in the corresponding individual year, every factor along a scientist's career span is calculated by using the h index formula. Thus L-Sequence shows the scientist's dynamic research trajectory and provides insight into his/her scientific performance at different periods. Furthermore, L proportional to, summing up all factors of L-Sequence, is for the evaluation of the whole research career as alternative to other h-index variants. Importantly, the partial factors of the L-Sequence can be adapted for different evaluation tasks. Moreover, L-Sequence could be used to highlight outstanding scientists in a specific period whose research interests can be used to study the history and trends of a specific discipline. (C) 2014 Elsevier Ltd. All rights reserved. C1 [Liu, Yu] Dalian Univ Technol, Sch Software, Dalian 116024, Peoples R China. [Yang, Yongliang] Dalian Univ Technol, Sch Life Sci & Biotechnol, Ctr Mol Med, Dalian 116024, Peoples R China. RP Liu, Y (reprint author), Dalian Univ Technol, Sch Software, Dalian 116024, Peoples R China. 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Informetr. PD JUL PY 2014 VL 8 IS 3 BP 478 EP 485 DI 10.1016/j.joi.2014.03.002 PG 8 WC Information Science & Library Science SC Information Science & Library Science GA AO5IE UT WOS:000341376700002 ER PT J AU Manganote, EJT Araujo, MS Schulz, PA AF Manganote, Edmilson J. T. Araujo, Mariana S. Schulz, Peter A. TI Visualization of ranking data: Geographical signatures in international collaboration, leadership and research impact SO JOURNAL OF INFORMETRICS LA English DT Article DE Institutional rankings; International collaboration; Research impact ID UNIVERSITY; QUALITY AB In this work we address the comprehensive Scimago Institutions Ranking 2012, proposing a data visualization of the listed bibliometric indicators for the 509 Higher Education Institutions among the 600 largest research institutions ranked according to their outputs. We focus on research impact, internationalization and leadership indicators, which became important benchmarks in a worldwide discussion about research quality and impact policies for universities. Our data visualization reveals a qualitative difference between the behavior of Northern American and Western European Higher Education Institutions concerning International collaboration levels. Chinese universities show still a systematic low international collaboration levels which are positively linked to the low research impact. The data suggests that research impact can be related directly to internationalization only to rather low values for both indicators. Above world average, other determinants may become relevant in fostering further impact. The leadership indicator provides further insights to the collaborative environment of universities in different geographical regions, as well as the optimized collaboration portfolio for enhancing research impact. (C) 2014 Elsevier Ltd. All rights reserved. C1 [Manganote, Edmilson J. T.] FACAMP Fac Campinas, BR-13083970 Campinas, SP, Brazil. [Manganote, Edmilson J. T.] Univ Estadual Campinas, Inst Fis Gleb Wataghin, BR-13083859 Campinas, SP, Brazil. [Araujo, Mariana S.; Schulz, Peter A.] Univ Estadual Campinas, Fac Ciencias Aplicadas, BR-13484350 Limeira, SP, Brazil. RP Manganote, EJT (reprint author), Univ Estadual Campinas, Inst Fis Gleb Wataghin, Rua Sergio Buarque de Holanda 777, BR-13083859 Campinas, SP, Brazil. 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PD JUL PY 2014 VL 8 IS 3 BP 642 EP 649 DI 10.1016/j.joi.2014.05.005 PG 8 WC Information Science & Library Science SC Information Science & Library Science GA AO5IE UT WOS:000341376700017 ER PT J AU Campanario, JM AF Miguel Campanario, Juan TI Analysis of the distribution of cited journals according to their positions in the h-core of citing journal listed in Journal Citation Reports SO JOURNAL OF INFORMETRICS LA English DT Article DE Journal citations; Journal distribution; Journal ranking ID IMPACT FACTOR; SCIENTIFIC JOURNALS; INDICATORS; RANKING; SCIENCE; PERFORMANCE; LIBRARY; MARKET; ISI AB The aim of this study is to analyze some properties of the distribution of journals that are cited in the h-core of citing journals listed in the Journal Citation Reports. Data were obtained from the 2011 edition of JCR available for universities in Spain. The citing journal matrix available in JCR was used to identify the cited journals that appear most frequently in the h-core. 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