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Journal metrics attempt to quantify the research impact of a publication or authors work. Referred to as the impact factor, these calculations attempt to provide context for the scientific importance, or relevance of a journal or publication.
Traditionally, two different companies have provided journal level metric data:
The library licenses the Scopus database from Elsevier. However, both publishers have made their data freely available to third parties, who in turn have developed their own mathematical models based on these datasets to determine a journals impact.
Scopus incorporates SCImago Journal & Country Rank along side their own proprietary metrics called CiteScore.
The SCImago Journal & Country Rank is a portal that includes the journals and country scientific indicators developed from the information contained in the Scopus® database (Elsevier B.V.). This platform takes its name from the SCImago Journal Rank (SJR) indicator, developed by SCImago from the widely known algorithm Google PageRank™.
"CWTS Journal Indicators provides free access to bibliometric indicators on scientific journals. The indicators have been calculated by Leiden University’s Centre for Science and Technology Studies (CWTS) based on the Scopus bibliographic database produced by Elsevier."
"A journal's Eigenfactor score is our measure of the journal's total importance to the scientific community....The journal citation data for the Eigenfactor.org website come from the Thomson-Reuters Journal Citation Reports (JCR)." This metric is freely available online.