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formula restriction in multinom?

Bert Gunter 
Note: multinom() is in nnet package.

In any case, the answer is, yes, this is "normal" behavior:

x^2 <==> x:x <==> x in S language linear model notation. So if you want a
quadratic you must use I(x^2). S-Plus does this silently, but it is not
required by the language definition.

-- Bert Gunter
Genentech Non-Clinical Statistics
South San Francisco, CA
 
"The business of the statistician is to catalyze the scientific learning
process."  - George E. P. Box

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Berry, Mark R formula restriction in multinom? May 9 Bert Gunter formula restriction in multinom? May 9