Answer:
Last Updated: Sep 24, 2015     Views: 198

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.  

If you don't have Harvard credentials, or if you need help with this, please Ask Us!

If you're unable to find your answer in our FAQs, please Ask Us!