[R] Naive Bayes Classifier

Prof Brian Ripley ripley at stats.ox.ac.uk
Wed May 16 17:28:08 CEST 2001

On Wed, 16 May 2001, Ursula Sondhauss wrote:

> I am looking for an implementation of the Naive Bayes classifier for a
> multi-class classification problem. I can not even find the Naive Bayes
> classifier for two classes, though I can not believe it is not
> available. Can anyone help me?

Hard to believe but likely true. However, as I understand this, it applies
to a (K+1)-way contingency table, with K explanatory factors and and one
response.  And the `naive Bayes' model is a particular model for that
table.  If you want a classifier, you only need the conditional
distribution of the response given the explanatory factors, and that is a
main-effects-only multiple logistic model.  Now the *estimation*
procedures may be slightly different (`naive Bayes' is not fully defined),
but if that does not matter, use multinom() in package nnet to fit this.

A book on Graphical Modelling (e.g. Whittaker or Edwards) may help
elucidate the connections.

Let me stress *as I understand this* here.

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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