5-Year Journal Impact Factor

5-Year Journal Impact Factor

The 5-year journal Impact Factor is the average number of times articles from the journal published in the past five years have been cited in the JCR year. It is calculated by dividing the number of citations in the JCR year by the total number of articles published in the five previous years.

The 5-Year Journal  Impact Factor measurement is the same as the Journal, but with three more years added to both the numerator and the denominator. Instead of a two-year window, it is a five-year window. In the 2015 JCR, the five-year window will include 2010, 2011, 2012, 2013 & 2014.

The calcuation is factored in the same mannner as the Journal Impact Factor, but considers a five-year window of citation data.

The 5-Year Journal Impact Factor provides a broader view onto the citation data, but at the expense of granularity (which is reduced).

Like the the Journal Impact Factor, the 5-Year Journal impact Factor is a publication-level metric. It does not apply to individual papers or subgroups of papers that appeared in the publication. Additonally, it does not apply to authors of papers, research groups, institutions, or universities. Also, note that the typical lag after publication of a paper until peak citation is variable (across papers, across time, across publications, and across domains). When the lag is greater than two years (which it often is), a publication’s 5-year Journal Impact Factor will tend to be higher than its Journal Impact Factor Also, Journal Impact Factor and 5-year Journal Impact Factor will typically be identical for the first two years that a publication is covered in the JCR.