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Vol. 3, No. 1 Fall 2005
The journal impact factor is the average
number of times articles from the journal published in the past
two years have been cited in the JCR year. The impact factor is
calculated by dividing the number of citations in the JCR year
by the total number of articles published in the two previous
years. An impact factor of 1.0 means that, on average, the articles
published one or two year ago have been cited one time. An impact
factor of 2.5 means that, on average, the articles published one
or two year ago have been cited two and a half times. Citing articles
may be from the same journal; most citing articles are from different
journals.
There are other important "impact
factor" measures, but journal impact factor is the one most commonly
referred to.
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