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 > -----Original Message----- > From: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED] On Behalf Of Berry, Mark R > Sent: Monday, May 09, 2005 11:33 AM > To: 'r-help@stat.math.ethz.ch' > Subject: [R] formula restriction in multinom? > > 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 > > > > > LEGAL NOTICE\ Unless expressly stated otherwise, this > messag...{{dropped}} > > ______________________________________________ > R-help@stat.math.ethz.ch mailing list > https://stat.ethz.ch/mailman/listinfo/r-help > PLEASE do read the posting guide! > http://www.R-project.org/posting-guide.html > ______________________________________________ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html