[R]: multinom()

Prof Brian D Ripley ripley at stats.ox.ac.uk
Sun Mar 26 10:18:08 CEST 2000

On Mon, 20 Mar 2000, Peter Ho wrote:

> Dear R users,
> Does anyone know if it is possible to use multinom to do a polychotomous
> fit using one categorical  and one numeric variable as response. The
> doc. for multinom states that for formula , response can be K>2 classes.
> Is this 2 and more, or as I have understood it only greater than 2. I
> have tried fitting my data, but have only encountered error messages.

It does work for K=2, but is not recommended. But what you want is not
a polychotomous fit, as that has only categories.
> On another note, Is it possible to get a set of discriminant scores for
> the multinom fit using predict.nnet or some other function like for lda
> using predict.lda?

Um, what do such scores mean? You can hack predict.multinom to do this,
but only differences in scores are relevant. It fits probabilities, only.	

Brian D. Ripley,                  ripley at stats.ox.ac.uk
Professor of Applied Statistics,  http://www.stats.ox.ac.uk/~ripley/
University of Oxford,             Tel:  +44 1865 272861 (self)
1 South Parks Road,                     +44 1865 272860 (secr)
Oxford OX1 3TG, UK                Fax:  +44 1865 272595

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