[R] Problem with PCA

[Gavin Simpson]

On Wed, 2008-03-05 at 19:43 -0800, phuong thao wrote:
> Dear Ms/Mr,
> In a package, I want to use PCA function. The structure I used follow this
> page: http://www.statmethods.net/advstats/factor.html.
>        fit<-principle(mydata, nfactors=9, rotation=TRUE)
>    or:
>        result<-PCA(mydata)
> 
> But I don't known why R language in my computer noticed: "not found
> principle", "not found PCA".

You have several problems:

It is 'principal' not 'principle' components analysis; the instructions
on that page clearly say:

fit <- principal(mydata, nfactors=5, rotation=TRUE)
       ^^^^^^^^^

And finally, you are not following all the steps on that page. You
*have* to load a package to use functions contained within in it.

principal() is in the psych package, so load it by executing:

library(psych)

PCA() is in the FactoMineR package, so load it by executing:

library(FactoMineR)

On the site you mention, all the R code chunks are higlighted by being
in monospace font with a thick green border to the left of the block.
Make sure you enter all the lines in those code chunks exactly as types
otherwise you'll get errors like the ones reported here.

HTH

G

> I download and installed R-2.6.2-win32.exe.
> Thanks alot for answering me.
> Hue University, VietNam.
> 
> 	[[alternative HTML version deleted]]
> 
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