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Mathematics & Statistics: Write/Cite/Publish

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Journal Impact Factors

 JOURNAL Rankings & Impact Factors

1. Journal Citation Reports (JCR)

  •  Subscription.  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.,).  For info. Click here.
  •  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:  For a 2008 journal, the 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.


  • Free. Uses all ISI data into a 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  

  • Free. 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)  

  • Free. Based on Google Scgolar ciatations. Analyzes 999 or less entries by author, journal. Gives Average cites/paper, Average number authors/paper, h-index.

5. In-Cites

  • A website 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).


1. PLoS Medicine Editors (June 6, 2006). "The Impact Factor Game". PLoS Medicine. doi:10.1371/journal.pmed.0030291.

2.Joint Committee on Quantitative Assessment of Research (June 12, 2008). "Citation Statistics" (PDF). International Mathematical Union.  Joint Committee on Quantitative Assessment of Research (June 12, 2008). "Citation Statistics" (PDF). International Mathematical Union. 

3. Seglen PO (1997). "Why the impact factor of journals should not be used for evaluating research". BMJ 314 (7079): 498–502. PMID 9056804. PMC: 2126010

4. C. T. Bergstrom. (May 2007). "Eigenfactor: Measuring the value and prestige of scholarly journals". College & Research Libraries News 68 (5).

5. Johan Bollen, Marko A. Rodriguez, and Herbert Van de Sompel. (December 2006). "Journal Status". Scientometrics 69 (3). 

Author Impact Factors

AUTHOR Impact Factor

1. h-Index

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

    E.g. a 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 is available for free!

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