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Research Impact

Includes measures of scholarly impact such as journal impact factors, researcher impact, citation analysis and altmetrics.

Measures and Definitions

Impact Factor (JIF)In any given year, the impact factor of a journal is the average number of citations received per paper published in that journal during the two preceding years. The impact factor is based on two figures:  the number of citations to a given journal over the previous two years (A) and the number of research articles and review articles published by that journal over the same two-year period (B), so:  A/B = Impact Factor  (JCR). A 5 year JIF has been introduced more recently.

Cited Half-Life - The citing half-life is the median age of articles cited by the journal in the JCR year.

Immediacy Index - The average number of times an article is cited in the year it is published.  (JCR)

IPP - The Impact per Publication measures the ratio of citations per article published in the journal. (Scopus)

Eigenfactor score - The number of times articles from a journal published in the past five years have been cited in a JCR year.

SNIP - Source-Normalized Impact per Paper (SNIP) measures contextual citation impact by weighting citations based on the total number of citations in a subject field.  (Scopus)  

SJR - SCImago Journal Rank (SJR indicator) is a measure of scientific influence of scholarly journals that accounts for both the number of citations received by a journal and the importance or prestige of the journals where such citations come from.  (Scopus) 


Journal Citation Reports

 Incites Journal Citation Reports (JCR) analyzes journal citation patterns to determine total cites, impact factor, impact factor without self cites, 5 year impact factor, immediacy index, citable items, cited half-life, citing half-life, Eigenfactor Score, and Article Influence Score for  journals in the sciences and the social sciences. Thomas Reuters.  See Training Video about InCites.

Search by Subject:

  1. Select Science Citation Index Expanded (SCIE) or Social Science Citation Index (SSCI)
  2. Click Select Categories and choose one or more categories.
  3. Choose JCR (Journal Citation Report) year.
  4. Data includes number of journals, number of articles, total cites, median impact factor, aggregate impact factor, aggregate immediacy index, aggregate cited half-life, aggregate citing half-life.

Search by Individual Journal Title:

  1. Under "Go to Journal Profile," search journal name, title keyword, or ISSN. If no year is selected, data will range from 1998 to the present.

To see category in which a specifical journal or journals is contained:

  1. Click Select Journals. Enter journal information by complete title, ISSN, abbreviated journal title, or title word.
  2. Choose the JCR (Journal Citation Report) year.
  3. Select Science Citation Index Expanded (SCIE) or Social Science Citation Index (SSCI)


Scopus   -  To see a list of sources available and their Source-Normalised Impact per Paper (SNIP) or SCImago Journal Rank (SJR), click on Browse Sources. Select a journal to display journal details. To analyze and compare journals, choose the Journal Analyzer.  You can compare up to ten journals.


Journal Metrics from Elsevier (Scopus) - Search the entire collection of journals covered by Scopus along with their SNIP, IPP and  SJR metrics going back to 1999.


SCImago Journal and Country Rank -  is a free Web site that uses Scopus data to calculate SCImago Journal Rank (SJR) and Source Normalized Impact per Paper (SNIP). The metrics compare to Web of Knowledge’s Impact Factor.

Google Metrics

Google Metrics - Type in the name of the journal. The h5-index and h5-median will appear if available. Select the hyperlinked h5-index to view the h5-core (articles cited at least h times) and to see if the journal is in the top 20 of a subject category. 

Eigenfactor and Article Influence

Search for Eigenfactor and Article Influence scores  - The journal citation data for the Eigenfactor website come from Thomson Reuter's InCites Journal Citation Reports (JCR) for each year since 1995. To be included on the Eigenfactor website, a journal either must be listed in the JCR or be cited in the last 5 years by a journal that is listed in the JCR. JCR also provides Eigenfactor metrics.  FAQ and Methodology

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