You should not depend solely on citation data when evaluating journals, but it can be used to help support and inform qualitative, peer review. Many factors can influence citation rates such as language, journal history, publication schedule, and subject specialty and scope.
Other factors which can affect a journal's ranking or metrics include:
Many of the journals in Web of Science and Scopus are English-language from North America, Western Europe and Australia. Irish journals in many research areas can be underrepresented.
Review journals and original research journals are treated the same even though the citation patterns of these types of articles differ.
CiteScore is a set of journal metrics produced by Elsevier and calculated using citation data from Scopus. A journal's CiteScore represents the average number of citations received in the CiteScore year (e.g. 2015), by papers published in the three preceding years (e.g. 2012, 2013 and 2014). In contrast, the Journal Impact Factor (Clarivate Analytics) uses a two year, rather than three year, window. All types of documents (research articles, review articles, conference proceedings, editorials errata, letters, notes, and short surveys) are included in the CiteScore calculation. Although articles in press are included in Scopus they are not included in the calculation. CiteScore rankings and CiteScore percentile metrics are also available.
CiteScore metrics (along with the SJR and SNIP) can be viewed on Scopus or through Elsevier's Journal Metrics website.
Source: journalmetrics.com (Elsevier)
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