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Impact Factor

Impact factors refer to the number of times an article in a journal has been cited.  It determines the journal's importance and ranking.  The higher a journal's impact factor the greater its importance in a specific field.

Calculating Impact Factor

A = the number of times articles published in 2008 and 2009 were cited by indexed journals during 2010.
B = the total number of "citable items" published in 2008 and 2009.
 

A/B = 2010 impact factor

 

Where to Find Impact Factors