Journal Citation Reports (JCR®) has added several additional journal metrics. JCR now reports the 5-Year Impact Factor. Because some fields have a longer lag in citation rate, the normal 2-Year Impact Factor may not capture the true influence for some journals.
JCR has also added the Eigenfactor™ Score and the Article Influence™ Score for 2007 and 2008 data sets. The Eigenfactor is similar to the 5-Year Impact Factor except that the Eigenfactor excludes self-citations, and includes citations to journals in science and social science. The Article Influence determines the average influence of individual articles in a journal, and is normalized, with a mean score of 1.00. Scores higher than 1.00 show above average influence. More information about these scores can be found at http://www.eigenfactor.org.
To account for journal self-citations, JCR now includes an adjusted Impact Factor, which excludes self-citations. To view the details of self-citations and the adjusted Impact Factor, click on the specific journal title in the result list.
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