minor incompatibility in model.matrix
Douglas Bates
bates@stat.wisc.edu
Thu, 18 Jun 1998 16:52:38 -0500 (CDT)
The S and S-PLUS versions of model.matrix will ignore elements of a
contrasts argument that do not correspond to factors. R does not. It
produces and error of
Error: contrasts apply only to factors
even if the contrasts themselves are NULL.
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