From Thomson Scientific's ISI Web of Knowledge ... the latest impact factors for most of the journals I read, i.e. those that publish cell biology & molecular biology manuscripts. Note that the list does not contain neuroscience or review journals.
(Inspired by Coturnix' entry.)
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How exactly does one find Thomson's Impact Factor calculations?
How exactly does one find Thomson's Impact Factor calculations?
The calculation is simple: if a journal has a 2004 IF of 5, then papers published in that journal in 2001-2002 were cited, on average, 5 times each in 2003.
As for the data from which Thomson calculates this meaningless metric, one does not find that -- it is proprietary.