Jfactor uses the same calculation method as Thomson Reuters impact factor*.
A = 2014 impact factor for journal X
B = 2014 citations to articles published by journal X in 2012 and 2013
C = total number of articles published by journal X in 2012 and 2013
A = B/C
Below we describe how data are collected to compute Jfactor.
References are collected with a heuristic process directly from the PDF files of the articles. As they are difficult to extract from the XML files. INSPIRE staff provides us with a json file as needed. This file is also parsed and the information transferred to an internal DB. There are roughly 16 mln references.
A table showing the latest data collected can be downloaded here.
There is a row for each year and each row contains 4 data points for each journal. Where known, the following are provided:
For more information and any other requests please contact firstname.lastname@example.org.