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Misconceptions surrounding the relationship between journal impact factor and citation distribution in veterinary
1Department of Clinical Sciences, Faculty of Veterinary Medicine, Université de Montréal, Saint-Hyacinthe, QC, Canada; Groupe de recherche en pharmacologie animale du Québec (GREPAQ), Université de Montréal, Saint-Hyacinthe, QC, Canada; Department of Veterinary Clinical and Diagnostic Sciences, Faculty of Veterinary Medicine, University of Calgary, Calgary, AB, Canada.
Objective:
To define the relationship between journal impact factor (JIF) and citation distribution in veterinary journals. Citation distribution is a summary of the number of citations of individual papers published in a defined period, and JIF is said to represent the mean number of citations received by a paper published in a given journal. JIF is criticized for promoting unimportant differences between journals, exaggerating small differences in journal citation distributions by misrepresenting a skewed citation distribution. The hypothesis was that veterinary journals have a skewed citation distribution and that median citation rates between journals would be smaller than that indicated by JIF.
Study Design:
Bibliometric study.
Animals:
None.
Methods:
A published method was used to generate journal citation reports from a commercial database, with search limits set for document ('article' and 'review') and the 2 year citation window of interest. Citation distributions [median (range)] and cumulative citations were calculated for Veterinary Anaesthesia and Analgesia (Vet Anaesth Analg, 2007-2017), 11 preselected subject- and species-specific and general veterinary journals (2016) and veterinary journals from the top (n = 10) and bottom (n = 10) of the Veterinary Sciences category ranking (2016) with a 10 year publication record.
Results:
Citation distributions were right-skewed for all journals, with 15-20% of papers contributing approximately 50% of citations. For Vet Anaesth Analg, the median citation distribution [1 (0-2)] did not change despite JIF ranging from 1.044 to 2.064 between 2007 and 2017. Calculated median citation rates revealed minimal differences between journals, with only three groups identified: bottom (median citation 0), preselected (median citation 1) and top (median citation 2) journals. These groups represent over 100 places in the JIF (0.316-3.148) ranking.
Conclusions:
Ranking veterinary journals according to JIF is misleading, exaggerating differences while concealing minimally different citation distributions.
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