[R]: multinom()

[Prof Brian D Ripley]

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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