Answered By: Jamie Emery
Last Updated: May 15, 2023     Views: 232

The "impact factor" was created by Dr. Eugene Garfield over 50 years ago as a way to measure the importance or impact of particular journals. It is one of several "quantitative tools for ranking, evaluating, categorizing, and comparing journals. The impact factor ... is a measure of the frequency with which the "average article" in a journal has been cited in a particular year or period." (text from Clarivate essay linked below.)

The impact factor is calculated by Clarivate in its Journal Citation Reports each year for the the journals included in its Social Sciences Citation Index and in its Science Citation Index Expanded.

For more information about the origin of the impact factor and how it is calculated, see the essays linked below. 

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