[R] formula restriction in multinom?

From: Berry, Mark R <mark.r.berry_at_pfizer.com>
Date: Tue 10 May 2005 - 04:33:19 EST


Good Day: When I used:
multinom(formula = Y ~ X1 + X2 + X3 + X1:X2 + X1:X3 + X3:X2 + X1^2 + X2^2 + X3^2, data = DATASET),
I get estimates and AIC for the model containing main effects and interactions only (no squared terms)...and FYI, all predictors are continuous. Is this "normal" behavior? If I run this in S-Plus I get estimates and AIC for the model containing all terms(including the squared terms).

   Thanks,
   Mark Berry

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