Looks like my post might get some problems, so I re-wrote my question plus some new one...



I noticed that the points on the biplot are not exactly the same as the predicted values.

Another relevant question: should I expect that all the vector points have the same length if  chose parameters of "cor=T ",
for example, pca2=princomp((data), cor=T)?


Could any body give me a  hint about  any of these questions?

Thanks.



________________________________

To: Jim Lemon <jim@bitwrit.com.au> 
Cc: "r-help@r-project.org" <r-help@r-project.org> 
Sent: Tuesday, April 30, 2013 9:51 AM
Subject: Re: [R] biplot for principal componens analysis




very helpful!! Thanks a lot.


________________________________
From: Jim Lemon <jim@bitwrit.com.au>

Cc: "r-help@r-project.org" <r-help@r-project.org> 
Sent: Monday, April 29, 2013 6:53 PM
Subject: Re: [R] biplot for principal componens analysis


On 04/30/2013 08:24 AM, capricy gao wrote:
>
>
> I did a PCA for my data which has a dimension of 19000X4 using princomp
>> pca2=princomp((data), cor=F)
>
>
>
>
>
> and obtained a biplot with 19000 labels which were very busy. How can I just show 19000 spot w/o labels?
>> biplot(pca2)
>
Hi capricy,
I suppose you could try:

biplot(pca2,xlabs=rep(".",19000))

Jim
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