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Journal Citation Reports: JCR ®

Journal Citation Reports has been disassociated from Web of Science subscriptions by the database vendor (Clarivate). Due to financial implications the University therefore does not have a current subscription to the JCR. The SCImago Journal Rank is a reliable, equally authoritative alternative to the JCR.


Through the analysis of citation references, Journal Citation Reports (JCR®) measures research influence and impact at the journal and category levels and shows the relationship between citing and cited journals. It is based on Web of Science data using the Science Citation Index Expanded and the Social Science Citation Index.

Note: the JCR impact factor should not be the only tool used by researchers to assess the usefulness of a journal. It is recommended that it be used together with informed peer review.

Journal Impact Factor (IF)

The Impact Factor is the average number of citations to papers in a journal in one year, from articles published in any Thomson Reuters listed journal during the previous two years.

  • Calculation of a Journal Impact Factor = A / B
    • A = number of citations from year Y to articles published in the journal during (Y-1 + Y-2)
    • B = number of articles* published in the journal during (Y-1 + Y-2)
  • Use to compare journals in the same field of research.
  • Citations to a journal are not weighted and self-citations are not counted in the calculation of Impact Factors.
  • Impact Factors are the most widely used bibliometric measure. It is an indication of journal influence but is frequently used inappropriately as a proxy to evaluate and compare researchers.

* articles include research articles, review articles, substantial notes. Items such as editorials, letters, news items, and meeting abstracts are not counted.

Eigenfactor™ Score

An Eigenfactor Score is the number of current year citations to citable items from the previous five years, similar to the pagerank algorithm used by Google.

  • Use to compare journals from the same or different fields of research.
  • A weighting is assigned to journals which is proportional to the number of incoming citations, with citations from highly cited journals weighted higher than those from less cited journals; self-citations are not counted.
  • All citations received by a journal are tracked so bigger journals tend to have higher Eigenfactor Scores.
  • The sum of Eigenfactor scores for all journals is 100; each journal's Eigenfactor Score is a proportion of this total.

Article Influence™ Score

The Article Influence™ Score determines the average influence of a journal's articles over the first five years after publication, calculated as the journal's Eigenfactor Score divided by the number of articles published by the journal.

  • Use to compare journals, from the same or different fields of research, on a per-article basis; this measure is more directly comparable to the Journal Impact Factor than the Eigenfactor Score.
  • A score > 1.00 indicates that articles in that journal have an above-average influence; a score < 1.00 indicates that the articles in the journal have a below-average influence.