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Last Updated: Sep 24, 2015     Views: 69

The impact factor measures how often an average article in a journal has been cited in a particular year or period, as published in ISI (Institute for Scientific Information)/Web of Science's Journal Citation Reports (JCR). The cited half-life measures the median age of the articles that were cited in a JCR year. 

If you have a Harvard University ID (HUID) or eCommons login and password, you can find out a journal's impact factor for yourself. From the Countway home page, click Web of Science

From Web of Science, click Journal Citation Reports and search for a journal to get information on its impact factor and cited half-life by year.  

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