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Moed, H.F.; Halevi, G.: On full text download and citation distributions in scientific-scholarly journals (2016)
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- Date
- 22. 1.2016 14:11:17
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Reedijk, J.; Moed, H.F.: Is the impact of journal impact factors decreasing? (2008)
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- Abstract
- The purpose of this paper is to examine the effects of the use of the citation-based journal impact factor for evaluative purposes upon the behaviour of authors and editors. It seeks to give a critical examination of a number of claims as regards the manipulability of this indicator on the basis of an empirical analysis of publication and referencing practices of authors and journal editors Design/methodology/approach - The paper describes mechanisms that may affect the numerical values of journal impact factors. It also analyses general, "macro" patterns in large samples of journals in order to obtain indications of the extent to which such mechanisms are actually applied on a large scale. Finally it presents case studies of particular science journals in order to illustrate what their effects may be in individual cases. Findings - The paper shows that the commonly used journal impact factor can to some extent be relatively easily manipulated. It discusses several types of strategic editorial behaviour, and presents cases in which journal impact factors were - intentionally or otherwise - affected by particular editorial strategies. These findings lead to the conclusion that one must be most careful in interpreting and using journal impact factors, and that authors, editors and policy makers must be aware of their potential manipulability. They also show that some mechanisms occur as of yet rather infrequently, while for others it is most difficult if not impossible to assess empirically how often they are actually applied. If their frequency of occurrence increases, one should come to the conclusion that the impact of impact factors is decreasing. Originality/value - The paper systematically describes a number of claims about the manipulability of journal impact factors that are often based on "informal" or even anecdotal evidences and illustrates how these claims can be further examined in thorough empirical research of large data samples.
- Language
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Moed, H.F.; Bruin, R.E.D.; Leeuwen, T.N.V.: New bibliometric tools for the assessment of national research performance : database description, overview of indicators and first applications (1995)
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- Abstract
- Gives an outline of a new bibliometric database based upon all articles published by authors from the Netherlands and processed during 1980-1993 by ISI for the SCI, SSCI and AHCI. Describes various types of information added to the database: data on articles citing the Dutch publications; detailed citation data on ISI journals and subfields; and a classification system of the main publishing organizations. Also gives an overview of the types of bibliometric indicators constructed. and discusses their relationship to indicators developed by other researchers in the field. Gives 2 applications to illustrate the potentials of the database and of the bibliometric indicators derived from it: one that represents a synthesis of 'classical' macro indicator studies on the one hand and bibliometric analyses of research groups on the other; and a second that gives for the first time a detailed analysis of a country's publications per institutional sector
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Matia, K.; Nunes Amaral, L.A.; Luwel, M.; Moed, H.F.; Stanley, H.E.: Scaling phenomena in the growth dynamics of scientific output (2005)
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- Abstract
- We analyze a set of three databases at different levels of aggregation: (a) a database of approximately 106 publications from 247 countries published from 1980-2001, (b) a database of 508 academic institutions from the European Union (EU) and 408 institutes from the United States for the 11-year period of 1991-2001, and (c) a database of 2,330 Flemish authors published in the period from 1980-2000. At all levels of aggregation we find that the mean annual growth rates of publications is independent of the number of publications of the various units involved. We also find that the standard deviation of the distribution of annual growth rates decays with the number of publications as a Power law with exponent 0.3. These findings are consistent with those of recent studies of systems such as the size of research and development funding budgets of countries, the research publication volumes of U.S. universities, and the size of business firms.
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Moed, H.F.: ¬The effect of "open access" on citation impact : an analysis of ArXiv's condensed matter section (2007)
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- Abstract
- This article statistically analyzes how the citation impact of articles deposited in the Condensed Matter section of the preprint server ArXiv (hosted by Cornell University), and subsequently published in a scientific journal, compares to that of articles in the same journal that were not deposited in the archive. Its principal aim is to further illustrate and roughly estimate the effect of two factors, early view and quality bias, on differences in citation impact between these two sets of papers, using citation data from Thomson Scientific's Web of Science. It presents estimates for a number of journals in the field of condensed matter physics. To discriminate between an open access effect and an early view effect, longitudinal citation data were analyzed covering a time period as long as 7 years. Quality bias was measured by calculating ArXiv citation impact differentials at the level of individual authors publishing in a journal, taking into account coauthorship. The analysis provided evidence of a strong quality bias and early view effect. Correcting for these effects, there is in a sample of six condensed matter physics journals studied in detail no sign of a general open access advantage of papers deposited in ArXiv. The study does provide evidence that ArXiv accelerates citation due to the fact that ArXiv makes papers available earlier rather than makes them freely available.
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Moed, H.F.; Vriens, M.: Possible inaccuracies occuring in citation analysis (1989)
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Glänzel, W.; Moed, H.F.: Journal impact measures in bibliometric research (2002)
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Braam, R.R.; Moed, H.F.; Raan, F.J. van: Mapping of science by combined co-citation and word analysis : T.1: Structural aspects - T.2: Dynamical Aspects (1991)
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Moed, H.F.: Differences in the construction of SCI based bibliometric indicators among various producers : a first overview (1996)
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Korevaar, J.C.; Moed, H.F.: Validation of bibliometric indicators in the field of mathematics (1996)
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Noyons, E.C.M.; Moed, H.F.; Luwel, M.: Combining mapping and citation analysis for evaluative bibliometric purposes : a bibliometric study (1999)
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Halevi, G.; Moed, H.F.: ¬The thematic and conceptual flow of disciplinary research : a citation context analysis of the journal of informetrics, 2007 (2013)
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Moed, H.F.; Halevi, G.: Multidimensional assessment of scholarly research impact (2015)
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Moed, H.F.: Statistical relationships between downloads and citations at the level of individual documents within a single journal (2005)
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Moed, H.F.; Leeuwen, T.N. van; Reedijk, J.: ¬A new classification system to describe the ageing of scientific journals and their impact factors (1998)
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Moed, H.F.; Luwel, M.; Nederhof, A.J.: Towards research performance in the humanities (2002)
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