Journal Impact Factor

The Journal Impact Factor (JIF) is the calculated by dividng the number of citations received by all of the articles in two previous calendar years of a journal by the total number of articles published in the two previous calendar years of those journals.  

Journal Impact Factors can be found in Journal Citation Reports, a subscription based resource that is available through Western Libraries.

 

Limitations of journal impact factor:

  • Only calculates citations for publications that are ndexed by Web of Science
  • Can only be used to evaluate journals within disciplines, not between them
  • Excludes journals covered by the Arts & Humanities Citation Index becasue their citation patterns are so different
  • Most journals are in English and from the developed world, although the Emerging Sources Citation Index is an effort to address that
  • Can be strongly influenced by outlier articles
  • Review articles tend to raise the impact factor