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Research Impact & Scholarly Publishing

Information about assessing researchers, publications, and journals and increasing the impact of your scholarship.

Impact Metrics

Journal Level Impact and Rankings


How To: Scopus Metrics

  • CiteScore
    • Source: Scopus
    • The number of citations received by a journal in the latest 4 years (including the calculation year), divided by the number of documents published in the journal in those four years. It is an average of citation behavior over a 4 year period.

  • Source-Normalized Impact per Paper (SNIP)
    • Source: Scopus
    • SNIP weights citations based on the number of citations in a field. If there are fewer total citations in a research field, then citations are worth more in that field. Journal's citation count per paper / citation potential in subject field.
  • SCImago Journal Rank (SJR)
    • Source: ScopusSCImago
    • This metric doesn't consider all citations of equal weight; the prestige of the citing journal is taken into account. Inspired by Google page rankings algorithm and the logic that "not all citations are created equally." Average number of weighted citations received in a year / number of documents in previous 3 years.


How To: Eigenfactor Score and AI

  • Eigenfactor Score
    • Source:
    • Measures the number of times articles published in the past 5 years from a particular journal have been cited in the year being evaluated.  Similar to JIF in that it is essentially a ratio of numbers of citations to the total number of articles. However it also eliminates self citations and weights each reference. Only includes information from 1997-2015.
  • Article Influence (AI) Score
    • Source:
    • The Eigenfactor score divided by the number of articles published in journal. "I know how impactful the journal as a whole is, but what about the average individual article in the journal?" Only includes information from 1997-2015.


How To: Google Scholar h5-index

  • h5-index
    • Source: Google Scholar
    • This metric is based on the articles published by a journal over 5 calendar years. h is the largest number of articles that have each been cited h times. A journal with an h5-index of 43 has published, within a 5-year period, 43 articles that each have 43 or more citations.


How To: CWTS Journal Indicators

  • Impact Per Publication (IPP)
    • Source: CWTS Journal Indicators
    • Also known as RIP (raw impact per publication), the IPP is used to calculate SNIP. IPP is number of current-year citations to papers from the previous 3 years, divided by the total number of papers in those 3 previous years.


Journal Citation Reports (not available through UTHSC)

  • Journal Impact Factor (JIF)
    • The number of citations made in the current year to articles in the previous 2 years, divided by the total number of citable articles from the previous 2 years. You may often find a journal's IF on the journal homepage, however note that you may not be able to verify without access to JCR.
  • 5-Year Journal Impact Factor
    • Citations to articles from the most recent five full years, divided by the total number of articles from the most recent five full years. "How much is this journal being cited during the most recent five full years?"
  • Journal Immediacy Index
    • Citations to articles from the current year, divided by the total number of articles from the current year. "How much is this journal being cited during the current year?"
  • Journal Cited Half-Life
    • For the current Journal Citation Reports year, the median age of journal articles cited. "What is the duration of citation to articles in this journal?"
  • Normalized Eigenfactor
    • Turns the Eigenfactor into a multiplier. A score of 2 is twice as good as a score of 1; a score of 20 is 4 times as good as a score of 5.