Facts about Impact Factors
- Impact Factors are only calculated for journals (not articles or researchers).
- Impact Factors are calculated by:
- selecting a JCR year
- adding the total # of citations to all items published in the two previous years that were cited in the JCR year
- divided by the total # of citable items (articles, reviews, and proceedings) published in that two previous years
- Impact factors are only available from Journal Citation Reports (JCR).
- Not every journal has an impact factor.
- Only journals indexed ISI Citation Indexes.
- Many subject areas in science and social science are covered in JCR.