R help - Jun 2005 - PCA and MDS

Dear All,

I am not familar with R. I want to use PCA (principal components
analysis) and MDS (multidimensional scaling). Can someone tell me
which R package I should use for PCA and MDS? I appreciate your help
in advance.

Ray

prcomp(stats) Principal Components Analysis
princomp(stats) Principal Components Analysis
scale(base) Scaling and Centering of Matrix-like Objects


2005/6/22, Ray Xiong <ray.xiong@gmail.com>:
> 
> Dear All,
> 
> I am not familar with R. I want to use PCA (principal components
> analysis) and MDS (multidimensional scaling). Can someone tell me
> which R package I should use for PCA and MDS? I appreciate your help
> in advance.
> 
> Ray
> 
> ______________________________________________
> R-help@stat.math.ethz.ch mailing list
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide! 
> http://www.R-project.org/posting-guide.html
> 


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On Wed, 22 Jun 2005, Guohui Ding wrote:
> prcomp(stats) Principal Components Analysis
> princomp(stats) Principal Components Analysis
> scale(base) Scaling and Centering of Matrix-like Objects
The first two are correct for PCA, but scale is not MDS.

MDS is available in cmdscale (stats), isoMDS (MASS), sammon (MASS) and 
elsewhere.
>> I am not familar with R. I want to use PCA (principal components
>> analysis) and MDS (multidimensional scaling). Can someone tell me
>> which R package I should use for PCA and MDS? I appreciate your help
>> in advance.
-- 
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 272866 (PA)
Oxford OX1 3TG, UK                Fax:  +44 1865 272595