Like the Impact Factor, the Eigenfactor™ Score and Article Influence™ Score use citation data to assess and track the influence of a journal in relation to other journals. Eigenfactor™ Metrics are available only for JCR years 2007 and later.

You can learn more about Eigenfactor Score and Article Influence Score at www.eigenfactor.org.

Eigenfactor Score

The Eigenfactor Score measures the number of times articles from the journal published in the past five years have been cited in the JCR year.

Like the Impact Factor, the Eigenfactor Score is essentially a ratio of number of citations to total number of articles. However, unlike the Impact Factor, the Eigenfactor Score:

• Counts citations to journals in both the sciences and social sciences.
• Eliminates self-citations. Every reference from one article in a journal to another article from the same journal is discounted.
• Weights each reference according to a stochastic measure of the amount of time researchers spend reading the journal.

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.

Eigenfactor™ Metrics, Eigenfactor™ Score, Article Influence™ Score are Licensed Marks used with permission from the University of Washington

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