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This article is confusing and incomplete. Especially, the calculation of so-called intrinsic value IV is not clear for me. What is scope of the sum operation? The sentence "where n is the number of examples left in the class after the test on the attribute" indicates that the definition depends on certain hidden model involving classification and tests. This article should either describe such a classification framework and point out the limited scope; or define "information gain ratio" as a general concept using only terminologies from probability theory. — Preceding unsigned comment added by 68.147.156.197 ( talk) 22:08, 15 December 2011 (UTC) reply

fixed the IV formula -- Erel Segal ( talk) 05:45, 13 February 2012 (UTC) reply