[R] pca in R

[Ista Zahn]

I've found the functions in the psych package easier to use than the
built in functions for principal components analysis.

-Ista

On Sat, Jan 30, 2010 at 2:09 PM, ogbos okike <ogbos.okike at gmail.com> wrote:
> Hi,
> I am learning how to do principal component analysis in R. However, since I
> am family with only a few built-in functions like prcomp, sd, cor, I started
> manually with examples in text books while trying to use the few functions I
> know to manipulate what they have in the text. From the example in the text
> I obtained a data set. Using cor and cov, I calculated the correlation and
> covariance of the data frame. I equally calculated standardized data as they
> did. They plotted a graph of the standardized X against Y, X against Z and Z
> against Y. I tried to plot the same graph in R but could not fit the First
> Principal Component as they did.
> I will be glad if anybody would be good enough as to guide me on how to fit
> this first (and probably second, third) principal component (s). As a
> begginer, I would appreciate any additional information on how to proceed
> with pca in R.
> Thank you.
> Ogbos
>
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>
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-- 
Ista Zahn
Graduate student
University of Rochester
Department of Clinical and Social Psychology
http://yourpsyche.org