[R] Nonlinear PCA function
Frank E Harrell Jr
fharrell at virginia.edu
Fri Oct 18 05:07:55 CEST 2002
On Thu, 17 Oct 2002 16:20:51 -0700
Jan de Leeuw <deleeuw at stat.ucla.edu> wrote:
> but since nonlinear PCA can de defined in various ways,
> you may have something different in mind
> --- Jan
> On Thursday, Oct 17, 2002, at 13:56 US/Pacific, Feng Zhang wrote:
> > Hey, all
> > Do you know if there are some Nonlinear PCA algorithm
> > or functions provided by R package?
> > Now I am working on this and want to see if somebody already did this
> > by R
> > language.
> > Thanks a lot.
> > Fred
The transcan function in the Hmisc package does nonlinear PCs, or at least it derives the nonlinear transformations you can feed into prcomp or other functions. See http://hesweb1.med.virginia.edu/biostat/s/Hmisc.html and a case study in my book Regression Modeling Strategies (Springer, 2001).
Frank E Harrell Jr Prof. of Biostatistics & Statistics
Div. of Biostatistics & Epidem. Dept. of Health Evaluation Sciences
U. Virginia School of Medicine http://hesweb1.med.virginia.edu/biostat
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