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Gerstein Science Information Centre

Help with Journals

Journal abbreviations, tips on finding journals, journal metrics

Journal Citation Reports

Journal Citation Reports (JCR) provides access to the following metrics:

    • Impact Factor: the frequency with which an "average article" in a journal has been cited in a given year; evaluative measure of a journal's relative importance. (Tutorial about JCR and Impact Factor )
      example of impact factor trend graph for JAMA



    • Article Influence Score: average influence, per article, of the papers in a journal (more info)


    • Eigenfactor Score: measure of the journal's total importance to the scientific community (more info)


    • Journal Self Cites: contribution of journal self cites to its Impact Factor


  • Journal Cited Half Life: median age of its items cited in the the current JCR year


To access JCR:

1. Go to the Gerstein Science Information Centre home page

2. Click on Journal Citation Reports



Video 1. David Pendlebury of Thomson Reuters discusses why impact factors were originally introduced and how they really should be used.



Video 2. How to use Journal Citation Reports to find journals ranked by impact factor in different subjects.


Scopus Journal Analyzer provides access to 5 types of evaluation:

  1. SJR: SCImago Journal Rank  (more info)
  2. SNIP: Source Normalised Impact Per Paper  (more info)
  3. Citations: total number of citations received by a journal per year
  4. Documents: number of articles published by a journal per year
  5. % Not Cited: percentage of articles that were not cited in a journal per year

To access:

1. Go to Scopus

2. Click on Analytics

Analytics link on Scopus search page 
Fig. 1: Analytics link from Scopus search page



  • measures the prestige of scholarly sources i.e. a citation from a source with a high SJR has more weight than a citation from a source with a lower SJR
  • normalizes for differences in citation behaviour between subject fields
  • research behind SJR

SJR values of three journals

Fig. 2: Comparing the SJR values of JAMA, New England Journal of Medicine and the BMJ



  • measures contextual citation impact by weighting citations based on the total number of citations in a subject field
  • citation frequency of different fields taken into account
  • considers immediacy: how quickly a paper is likely to have an impact
  • research behind SNIP

SNIP values of three journals
Fig. 3: Comparing the SNIP values of JAMA, New England Journal of Medicine and the BMJ


Video 1. How SNIP and SJR are calculated.