Elkins, MR; Maher, CG; Herbert, RD; Moseley, AM; Sherrington, C. 2010. Correlation between the Journal Impact Factor and three other journal citation indices. SCIENTOMETRICS 85 (1): 81-93
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Tue Sep 21 13:16:11 EDT 2010
Elkins, MR; Maher, CG; Herbert, RD; Moseley, AM; Sherrington, C. 2010.
Correlation between the Journal Impact Factor and three other journal citation
indices. SCIENTOMETRICS 85 (1): 81-93.
Author Full Name(s): Elkins, Mark R.; Maher, Christopher G.; Herbert, Robert D.;
Moseley, Anne M.; Sherrington, Catherine
Document Type: Article
Author Keywords: Bibliometric analysis; Citation analysis; Impact factor
KeyWords Plus: SCIENCE; NONSENSE; SENSE; TOOL
Abstract: To determine the degree of correlation among journal citation indices
that reflect the average number of citations per article, the most recent journal
ratings were downloaded from the websites publishing four journal citation
indices: the Institute of Scientific Information's journal impact factor index,
Eigenfactor's article influence index, SCImago's journal rank index and Scopus'
trend line index. Correlations were determined for each pair of indices, using
ratings from all journals that could be identified as having been rated on both
indices. Correlations between the six possible pairings of the four indices were
tested with Spearman's rho. Within each of the six possible pairings, the
prevalence of identifiable errors was examined in a random selection of 10
journals and among the 10 most discordantly ranked journals on the two
indices. The number of journals that could be matched within each pair of
indices ranged from 1,857 to 6,508. Paired ratings for all journals showed strong
to very strong correlations, with Spearman's rho values ranging from 0.61 to
0.89, all p < 0.001. Identifiable errors were more common among scores for
journals that had very discordant ranks on a pair of indices. These four journal
citation indices were significantly correlated, providing evidence of convergent
validity (i.e. they reflect the same underlying construct of average citability per
article in a journal). Discordance in the ranking of a journal on two indices was
in some cases due to an error in one index.
Addresses: [Elkins, Mark R.] Royal Prince Alfred Hosp, Dept Resp Med,
Camperdown, NSW 2050, Australia; [Maher, Christopher G.; Herbert, Robert D.;
Moseley, Anne M.; Sherrington, Catherine] Univ Sydney, George Inst Int Hlth,
Sydney, NSW 2050, Australia
Reprint Address: Elkins, MR, Royal Prince Alfred Hosp, Dept Resp Med,
Missenden Rd, Camperdown, NSW 2050, Australia.
E-mail Address: elkinsm at med.usyd.edu.au
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