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Journal Citation Reports (JCR)

Per Thomson Reuters, the JCR provides quantitative tools for ranking, evaluating, categorizing, and comparing journals. The impact factor is one of these; it is a measure of the frequency with which the "average article" in a journal has been cited in a particular year or period. The annual JCR impact factor is a ratio between citations and recent citable items published. Thus, the impact factor of a journal is calculated by dividing the number of current year citations to the source items published in that journal during the previous two years 

Calculation for journal impact factor. A= total cites in 1992 B= 1992 cites to articles published in 1990-91 (this is a subset of A) C= number of articles published in 1990-91 D= B/C = 1992 impact factor

Scientific Journal Rankings

The SCImago Journal & Country Rank (SJR) is a public portal that includes the journals and country scientific indicators developed from the information contained in the Scopus® database.  These indicators can be used to assess and analyze scientific domains.  Journals can be compared or analysed separately.  Country rankings may also be compared or analysed separately.   Journals can be grouped by subject area, category or country.  Citation data is drawn from over 21,500 titles from more than 5,000 international publishers and country performance metrics from 239 countries worldwide.