R-alpha: model.matrix(.) does not allow `contrasts' ..

Thomas Lumley thomas@biostat.washington.edu
Thu, 4 Dec 1997 09:41:09 -0800 (PST)

On Thu, 4 Dec 1997, Martin Maechler wrote:

> and this breaks  multinom from the nnet library
> 	[yes, Kurt, I'm working on that and I'll send you patches..]	
> Is this a bug or an (half-)intentional difference to S ?

I think it's a bug -- you should be able to specify contrasts on a
model-by-model basis if you really want to.  Fortunately it's very rare
for people to use this feature.


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