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Carl Bergstrom, College & Research Libraries News, May 2007
Eigenfactor (EF) and Article Influence (AI)
In 2011, the journal Naturehas the highest Eigenfactor score, with a score of 1.65524. The top thousand journals, as ranked by Eigenfactor score, all haveEigenfactor scores above 0.01.
DEFINITION #2: Article Influence Score
The Article Influence Score calculates measures the relative importance of the journal on a per-article basis. It is the journal's Eigenfactor Score divided by the fraction of articles published by the journal. That fraction is normalized so that the sum total of articles from all journals is 1.
The mean Article Influence Score is 1.00. A score greater than 1.00 indicates that each article in the journal has above-average influence. A score less than 1.00 indicates that each article in the journal has below-average influence.
Article Influence scores of a journal can vary between http://www.eigenfactor.org/ and JCR, even for the same year. This may be because the eigenfactor metrics take into account some other sources, such as dissertation and newspaper citations.
Article Influence (AI) Sample
In 2011, the top journal by Article Influence score is Reviews of Modern Physics, with an article influence of 28.9002. This means that the average article in that journal has twenty eight times the influence of the mean journal in the JCR.