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Reasons for Journal Impact Factor Changes: Influence of Changing Source Items

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  • Tobias Kiesslich
  • Silke B Weineck
  • Dorothea Koelblinger

Abstract

Both the concept and the application of the impact factor (IF) have been subject to widespread critique, including concerns over its potential manipulation. This study provides a systematic analysis of significant journal Impact Factor changes, based on the relative contribution of either one or both variables of the IF equation (i.e. citations / articles as the numerator / denominator of the quotient). A cohort of JCR-listed journals which faced the most dramatic absolute IF changes between 2013 and 2014 (ΔIF ≥ 3.0, n = 49) was analyzed for the causes resulting in IF changes that theses journals have experienced in the last five years. Along with the variation by number of articles and citations, this analysis includes the relative change of both variables compared to each other and offers a classification of `valid`and `invalid`scenarios of IF variation in terms of the intended goal of the IF to measure journal quality. The sample cohort features a considerable incidence of IF increases (18%) which are qualified as `invalid`according to this classification because the IF increase is merely based on a favorably changing number of articles (denominator). The results of this analysis point out the potentially delusive effect of IF increases gained through effective shrinkage of publication output. Therefore, careful consideration of the details of the IF equation and possible implementation of control mechanisms versus the volatile factor of number of articles may help to improve the expressiveness of this metric.

Suggested Citation

  • Tobias Kiesslich & Silke B Weineck & Dorothea Koelblinger, 2016. "Reasons for Journal Impact Factor Changes: Influence of Changing Source Items," PLOS ONE, Public Library of Science, vol. 11(4), pages 1-12, April.
    • Handle: RePEc:plo:pone00:0154199
    DOI: 10.1371/journal.pone.0154199
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    References listed on IDEAS

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    1. Benjamin M. Althouse & Jevin D. West & Carl T. Bergstrom & Theodore Bergstrom, 2009. "Differences in impact factor across fields and over time," Journal of the American Society for Information Science and Technology, Association for Information Science & Technology, vol. 60(1), pages 27-34, January.
    2. Mutz, Rüdiger & Daniel, Hans-Dieter, 2012. "Skewed citation distributions and bias factors: Solutions to two core problems with the journal impact factor," Journal of Informetrics, Elsevier, vol. 6(2), pages 169-176.
    3. Tom Clarke, 2003. "Copied citations give impact factors a boost," Nature, Nature, vol. 423(6938), pages 373-373, May.
    4. Jerome K. Vanclay, 2012. "Impact factor: outdated artefact or stepping-stone to journal certification?," Scientometrics, Springer;Akadémiai Kiadó, vol. 92(2), pages 211-238, August.
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    Cited by:

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    5. Wilhite, Allen & Fong, Eric A. & Wilhite, Seth, 2019. "The influence of editorial decisions and the academic network on self-citations and journal impact factors," Research Policy, Elsevier, vol. 48(6), pages 1513-1522.
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