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Impact Factor : Home

About the Impact Factor

There are a variety of journal ranking metrics.  However, the most widely known is the journal Impact Factor.  Compiled by Thomson Reuters'  Journal Citation Reports, the journal impact factor (IF) is the average number of citations in a year given to eligible papers in a journal published in the previous 2 years.

Glossary of Terms

See the Glossary of Thomson Scientific Terminology for more information.
SJR (SCImago Journal Rank) indicator
It expresses the average number of weighted citations received in the selected year by the documents published in the selected journal in the three previous years
H Index
The h index expresses the journal's number of articles (h) that have received at least h citations. It quantifies both journal scientific productivity and scientific impact and it is also applicable to scientists, countries, etc.
Article Influence
A measure of the average influence of each of its articles over the first five years after publication.
The Eigenfactor® score of a journal is an estimate of the percentage of time that library users spend with that journal. It is comparable to the Google PageRank measure.
Article-level metrics based on article views, downloads and social media postings.

Contributing Librarians


Mahalo to Denise Gehring at Azusa University Library for allowing the use of her libguide page as a template.