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The IF provides quantitative tools for ranking, evaluating, categorizing, and comparing journals. The impact factor is a measure of the frequency with which the "average article" in a journal has been cited in a particular year or period. The impact factor of a journal is calculated by dividing the number of current year citations to the source items published in that journal during the previous two years.
The impact factor is useful in clarifying the significance of absolute (or total) citation frequencies. It eliminates some of the bias of such counts which favor large journals over small ones, or frequently issued journals over less frequently issued ones, and of older journals over newer ones. Particularly in the latter case such journals have a larger citable body of literature than smaller or younger journals. All things being equal, the larger the number of previously published articles, the more often a journal will be cited.
Calculation of journal impact factors:
A= Total cites in 2015
B = 2015 cites to articles published in 2013-2014 (this is the subset of A)
C = Number of articles published in 2013- 2014
D = B/C = 2015 Impact Factor
Here is the list of all the top journals which are indexed, this helps in differentiating the true journals which are well indexed from that of fake journals. This document will also provide you the journal cited half - life.
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Regards,
Deepak Kumar Bandari,
Pharm.D Intern,
Vaagdevi College of Pharmacy - India
Elsevier Student Ambassador - South Asia
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