What is Impact factor?

A journals's Impact factor is a measure reflecting the number of citations the journal has in a given year. Impact factor is determinated each year, on the basis of the two previous years.

Impact factor is a quantitative tool for comparing journals, and not a measure for the individual published articles.

The more citations a journal has, the higher the Impact factor.

The main source for finding the Impact factor is ISI- Journal Citations Reports. The basis for the calculation is the journals indexed in this database.

Impact factor is often used as a quality measure for research. Impact factor used as this is controversial and should be used with care.

Calculation of the journal Nature's Impact factor in 2009

  • Citations of published articles in Nature in 2007+2008=59 996
  • Number of published articles in Nature in 2007+2008=1 740

Citations of Nature : Published articles in Nature = Impact factor

59 996 : 1740 = 34,480

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Published Sep. 6, 2013 10:33 AM - Last modified May 3, 2016 1:40 PM