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- W2735258014 abstract "New versions of journal impact factor are proposed for comparing them with JCR IF. They focus on the journal self-citation and the number of citing sources. The proposed versions are grouped into: 1) IFs penalized by self-citations, 2) IF encouraged by the number of citing sources and 3) IFs combining the penalized IFs and encouraged IF. This study evaluates the impact of journal self-citations and distribution of citations among sources on JCR IF. The study indicates that self-citations have little impact on the values of IF and the IF rankings, whether or not journal self-citations are included. The proposed indicators have been evaluated for the 30 journals in Computer Science field indexed in JCR 2013. The Spearman’s ρ correlation between the JCR IF and IFs penalized by self-citations is in the range of 0.76–0.96 and the Kendall’s τ correlation is in the range of 0.57–0.86. The study also indicates that compared to the IFs penalized by self-citations, the IF encouraged (EIF) by the number of citing sources correlated moderate with the JCR IF, the Spearman’s ρ correlation is 0.73 and the Kendall’s τ correlation is 0.59. Experiment results showed that the JCR IF moderately correlated with the combined IFs, Spearman’s ρ correlation is in the range of 0.69–0.72 and Kendall’s τ correlation is in the range of 0.55–0.58. We also showed that penalization strategy of self-citation can influence on the result. For example, IF linearly penalized (LPIF) by self-citations highly correlated with the JCR IF (Spearman’s ρ correlation is 0.99 and Kendall’s τ correlation is 0.93), and IF non-linearly penalized (nLPIF) by self-citations moderately correlated with the JCR IF (Spearman’s ρ correlation is 0.76 and Kendall’s τ correlation is 0.57). Finally, we concluded that IFs with and without penalization of self-citations lowly correlated with the number of articles and the number of citing sources." @default.
- W2735258014 created "2017-07-21" @default.
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- W2735258014 date "2017-01-02" @default.
- W2735258014 modified "2023-10-18" @default.
- W2735258014 title "Modifications to the journal impact factor" @default.
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- W2735258014 doi "https://doi.org/10.1080/09737766.2016.1235251" @default.
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