The journal impact factor is the average number of times articles from a given journal published in the past two years have been cited in the JCR year.
Calculated by dividing the number of citations from the entire body of scholarly articles in the JCR [current] year by the total number of articles published in a given journal in the two previous years.
JIF is a measure of extreme currency – 2 year window.
JIF is a GROSS average. Ave. article in Child Abuse & Neglect cited 1.506 times, but the citations RANGE from 0-25 times.
Never ever intended to measure quality of an individual article or author.