From summer 2014, Scopus and the Centre for Science and Technology Studies (CWTS) at Leiden University will be publishing a new journal-level metric called Impact per Publication (IPP).This metric is similar to Thomson Reuters’ journal Impact Factor (IF) and is based on citations in one year to articles, reviews, and conference papers published in the preceding three years, divided by the number of articles, reviews, and conference papers published in those three years.
2013 Impact per Publication formula:
There are several key differences between the IPP and IF. Most obviously, the IPP uses citations to a three-year window of content rather than either the two years or five years used by the Impact Factor. Unlike the Impact Factor, which only considers the journal name and year in a citation, this new metric has been constructed on article-level citations, therefore it can distinguish between citations to editorials and articles. It has been decided that citation to content other than articles, reviews, and conference papers should be excluded; this means that the metric does not include “free” citations to or from content such as editorials. However, as with the Impact Factor, articles that have been published as latest articles (without pagination) will not be included in either citation or article counts for the IPP.
We have the option to display the new Impact metric on Taylor & Francis Online. If you think this would be suitable for your journal, please discuss with your Managing Editor.