[R] quadratic discriminant analysis ?
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:
> 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
> 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
r-help mailing list -- Read http://www.ci.tuwien.ac.at/~hornik/R/R-FAQ.html
Send "info", "help", or "[un]subscribe"
(in the "body", not the subject !) To: r-help-request at stat.math.ethz.ch
More information about the R-help