Impact Factors and other quality measures

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Impact Factor
The Impact Factor is the most widely referenced quality measure amongst academic publications. It is defined as the
ratio between citations and recent citable articles published in a journal; the average number of citations received per
published article. The following is an explanation of how Thomson Reuters calculate Impact Factors.
Calculating Impact Factors
Citations in 2007 to articles published in: 2006 187 total citations
2005 318 total citations
Sum 505
Number of articles published in: 2006 54 total articles
2005 46 total articles
Sum 100
Calculation: 505 Total citations to articles published in 2005 and 2006
100 Number of articles published in 2005 and 2006
The 2007 Impact Factor for the journal is 5.050
Impact Factors vary greatly by subject discipline and comparison is only meaningful within the same subject category or group.

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