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Computer Science: Subject Guide: Impact Factors

Journal Abbreviations

Digital Object Identifier (DOI)

A DOI is a unique and persistent identification number for the digital object with which it is associated. DOIs are commonly assigned to online scientific articles. Many journals now require DOIs to be included in references. More about DOI.

Have a DOI and need to find out the citation?

Go to the DOI Resolver page, type in the DOI string and click on "Submit". If you are on campus, the DOI Resolver will take you to the "Find it at GSU" page. This page not only shows you the citation of the article, but also shows you if we have the article electronically or in print. If we don't have it in either form, an ILL link will show up so you can request it through Interlibrary Loan.

Have the citation and need to find out its DOI?

Go to the CrossRef Simple Text Query page, paste your reference in the box provided and click on "Submit". It will provide the DOIs if available.

Note: Some articles don't have a DOI.

Journal Ranking and Impact Factors

 1. Journal Citation Reports (JCR)

  •  Allows to search by journal or category as well as to perform a customize a search. Other data is also available (e.g., five-year impact factor, Immediacy Index, Cited-half Life, rank in category, etc.,). 
  • Impact factor is a measure of the relative importance of a journal.  Impact factors give a quantitative measure of a journal’s influence and impact.  Impact Factors compare the citation impact of one journal with others. 
    An Impact Factor gives the average number of times articles from a journal published 2 years that been cited in the Journal Citation Report year. Note:
    Impact Factors are attached to journals, not authors.

E.g. The 2008 Impact Factor for a Journal:

A = the number of times articles published in 2006-7 were cited in indexed journals during 2008
B = the number of articles, reviews, proceedings or notes published in 2006-7
HENCE:   Impact Factor (IF) = A/B

E.g.  A  2008 journal with an Impact Factor (IF) of say 3.333 means that on average, each of its 2006 and 2007 articles was cited 3.333 times in 2008.


  • Uses all ISI data into an algorithm like Google’s PageRank.  Looks at 5 years of data, removes self-citations, and is available in JCR.
  • Gives the Article Influence score (i.e. average influence per article of the papers in a journal, similar to IF).  Also gives the Eigenfactor score (i.e. a measure of the total importance (or value) to science) published in a given year of a journal.  These scores are scaled down such that all journals listed in JCR is 100.  The cost effectiveness values are also provided.

3. Scimago Journal Rank  

  • Similar to eigenfactor, but based on citations in Scopus. Uses PageRank algorithm with 3 years of citation data and no self-citations.  Contains >1300 journals which are more internationally diverse 

4. Publish or Perish (PoP)  

  • Based on Google Scholar citations. Analyzes 999 or less entries by author, journal. Gives average cites/paper, average number authors/paper, h-index.

5. In-Cites

  • From Thompson's Essential Science Indicators includes citation count information, impact statistics, and assessments of scholarly achievement by author, institution, country and journal.  The "Sci-Bytes" section contains "Hot Papers" and top impact rankings by subject field.

6. Others

Journal Usage Factors (Journal Usage Data)

Y Factor (IF & Weighted PageRank from Google)

MESUR (Metrics from Scholarly Usage of Resources) by RedJasper


Impact factors have criticism e.g., limited subset-only uses articles cites by  9000 journal (approx), some disciplines are not completely covered, baised towards English–language journals, short snapshot of a journal, it is an average, includes self-citations, includes only citable articles in the denominator of IF equation), editors can skew data by increasing number of review articles (bring in more citations) or increase number of news items (may not be cited).


Subject Guide

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Laura Carscaddon
Library South 542 (Subject Librarian suite)

Author Impact Factors

1. h-Index

  • Assess scientific productivity of a scientist, group or institution via quantity (# papers) and quality (# citations).  The index is based on a balance between the scientists most cited papers and their number of citations per publication.

    E.g. an h-Index of 25 means that the author has 25 publications that have recieved at least 25 citations.

  • Obtained from Web of Science.
    using the View Citation Report"Create Citation Report" icon)

  • For more info. Click here

2. h-Index from Scopus