Answered By: Rachel Welch
Last Updated: Apr 10, 2015     Views: 5

An impact factor shows how often articles in a particular journal or category have been cited. In Journal Citation Reports an impact factor is calculated the following formula: Number of Citations in JCR Year/Total number of articles published in previous two years. An impact factor of 1.0 shows that on average the articles in the journal published one or two years ago have been cited once.

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