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The SCImago research group is located at the Consejo Superior de Investigaciones Científicas (CSIC), University of Granada, Extremadura, Carlos III (Madrid) and Alcalá de Henares. The SCImago Journal & Country Rank provides journal rankings based on three-year's worth of citation data from SCOPUS, a major Elsevier scientific abstracting and indexing database.
Unlike Journal Citation Reports (JCR), SCImago journal metrics are free to all users regardless of institutional affiliation. Its journal rankings are based on the SCImago Journal Rank (SJR) indicator, a refinement of Google's PageRank algorithm. SJR understands journal prestige "as a function not of just the quantity of citations received but of a combination of the quantity and the quality" (The SJR Indicator: A New Indicator of Journals' Scientific Prestige).