The Article Influence score measures the average influence, per article, of the papers in a journal. As such, it is comparable to Thomson Scientific's Impact Factor. It is calculated by dividing the Eigenfactor score by the number of articles published. Article Influence scores are normalized so that the mean article in the entire Thomson Journal Citation Reports (JCR) database has an article influence of 1.00.
The Article Influence score is a journal specific Eigenfactor score. It is calculated by dividing the Eigenfactor score of the journal by the number of articles published. It tells the average impact of an article published in a journal from a five year period after the publication of the article. The Article Influence score is comparable with the IF of Thomson Reuters.
The Article Influence scores for journals are available at http://www.eigenfactor.org/. Thomson Reuter's Journal Citation Reports also publishes Article Influence scores in edition 2007 and later at http://www.isiknowledge.com/JCR.