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2007 Feb 27
2
factor documentation issue
There is a warning in the documentation for ?factor (R version 2.3.0) as follows: " The interpretation of a factor depends on both the codes and the '"levels"' attribute. Be careful only to compare factors with the same set of levels (in the same order). In particular, 'as.numeric' applied to a factor is meaningless, and may happen by implicit coercion.