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Journal Rankings: Commonly used rankings

Impact Factor (IF)

Definition: A measure of the frequency with which the "average article" in a journal has been cited in a particular year or period. Thomson Reuters

Calculation: 2012 impact factor = A/B.
A = the number of times articles published in 2011 and 2012 were cited by journals indexed by Thomson Reuters' Web of Science during 2012.
B = the total number of "citable items" published by that journal in 2011 and 2012

Available from: Journal Citation Reports/JCR

Journal Rankings by Discipline

Impact per Publication (IPP)

Definition:  The Impact per Publication measures the ratio of citations in a year (Y) to scholarly papers published in the three previous years (Y-1, Y-2, Y-3) divided by the number of scholarly papers published in those same years (Y-1, Y-2, Y-3). Scopus

Available from: Scopus Journal Metrics

EigenFactor

Definition: Ranking based on incoming citations for a journal with more weight given to citations from significant and larger journals.

Available from:  Journal Citation Reports/JCR and Eigenfactor Search

Further information: Eigenfactor: Detailed Methods (2007)

Article Influence

Definition:  A measure of the average influence of each of a journals' articles over the first five years after publication. 

  • It is the journal's Eigenfactor score divided by the fraction of articles published by the journal.That fraction is normalized so that the sum total of articles from all journals is 1.
  • The mean Article Influence score is 1.00. A score greater than 1.00 indicates that each article in the journal has above-average influence. A score less than 1.00 indicates that each article in the journal has below-average influence.

Available from: Journal Citation Reports/JCR and Eigenfactor Search