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 Journal Impact Factor

Measures the average citations received by recent articles of a Journal.

JIF  in a year X = Citations in year X to items published in X-1 and X-2 

                              -----------------------------------------------------------------

                                Citable items published in X-1 and X-2

 

Ex. Journal Articles   500 citations  .-. 100 citable items = JIF 5.0

      (X-1 & X-2) 

Introduced by 

Eugene Garfield

Published in Journal citation reports

Citation Window

Previous two years

used for 

Journal evaluation and selection