The Impact Factor is a tool for ranking, evaluating, categorizing, and comparing journals.
The most common expression of the impact factor (IF) is in the form of the algebraic expression: C=A/B
A = the number of times articles published in two consecutive years were cited by indexed journals in the next year.
B = the total number of "citable items" published by that journal in two consecutive years. ("Citable items" are usually articles, reviews, proceedings, or notes; not editorials or Letters-to-the-Editor.)
C = impact factor
A= 2009 cites to articles published in 2007-2008
B= number of articles published in 2007-2008
C= A/B = 2009 impact factor
The most common source for impact factors is the Thomson-Reuters database Journal Impact Factors.
A journal's Eigenfactor score is a measure of the journal's total importance to the scientific community.
A journal's Article Influence score is a measure of the average influence of each of its articles over the first five years after publication. Article Influence score measures the average influence, per article, of the papers in a journal. As such, it is comparable to Thomson Scientific's widely-used Impact Factor.
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