Re: [R] slightly off-topic re prcomp()

From: Berton Gunter <gunter.berton_at_gene.com>
Date: Thu 09 Feb 2006 - 06:37:36 EST


If you don't get a response:

reproducible example, please.

I suspect that you're looking at numerical analysis artifacts, assuming I have correctly interpreted you.

"The business of the statistician is to catalyze the scientific learning process." - George E. P. Box    

> -----Original Message-----
> From: r-help-bounces@stat.math.ethz.ch
> [mailto:r-help-bounces@stat.math.ethz.ch] On Behalf Of Laura Quinn
> Sent: Wednesday, February 08, 2006 9:50 AM
> To: r-help@stat.math.ethz.ch
> Subject: [R] slightly off-topic re prcomp()
>
> Hi,
>
> I was wondering if anyone could tell me why prcomp() will
> "Invent" modes
> of variation in a PCA on identical replicates of data? I would have
> expected 50 (or whatever number) of identical replicates to
> return a null
> score in such an analysis (or at the least, all variables
> would share the

> same PC score). This is not the case and I was wondering could someone
> point me in the direction of some literature to explain the
> reason behind
> this?
>
> Laura Quinn
> Institute of Atmospheric Science
> School of Earth and Environment
> University of Leeds
> Leeds
> LS2 9JT
>
> tel: +44 113 343 1596
> fax: +44 113 343 6716
> mail: laura@env.leeds.ac.uk
>
> ______________________________________________
> R-help@stat.math.ethz.ch mailing list
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> PLEASE do read the posting guide!
> http://www.R-project.org/posting-guide.html
>



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 Received on Thu Feb 09 07:51:04 2006

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