[R] quadratic discriminant analysis ?

ripley@stats.ox.ac.uk ripley at stats.ox.ac.uk
Fri May 17 10:08:11 CEST 2002

On Fri, 17 May 2002, [ISO-8859-1] Daniel Amorèse wrote:

> Hello,
> I am a beginner in R and data analysis.
> I have the VR (MASS) library installed and "Modern Applied Statististics
> with S-Plus" is my bedside book.
> Could anybody provide me an R script (or pieces of an R script) to perform
> a
> stepwise quadratic discriminant analysis ?

That needs distribution theory not implemented in R (to my knowledge).

QDA is rather dependent on multivariate normality, and the stepwise
variants are even more so.  It seems to be very rarely appropriate.

When I wanted an example, a student ran one for me in what I recalled was
SPSS under VMS (and it looks like SPSS output), but last time I looked I
could not see it on the PC version.

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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