Re: [R] Factor loadings and principal component plots

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From: Jari Oksanen (jarioksa@sun3.oulu.fi)
Date: Tue 04 May 2004 - 18:02:42 EST


Message-id: <1083657762.7580.20.camel@biol102145.oulu.fi>


On Tue, 2004-05-04 at 09:56, Prof Brian Ripley wrote:
> On 4 May 2004, Jari Oksanen wrote:
>
> > On Tue, 2004-05-04 at 09:34, Prof Brian Ripley wrote:
> >
> > >
> > > Yes, but princomp is the recommended way, not prcomp.
> >
> > But the documentation seems to recommend prcomp:
>
> For numerical accuracy, but not for flexibility.
>
Wouldn't the best alternative be to combine flexibility and accuracy
into one alternative? I mean, I'd still use prcomp after reading the
help pages, and I'd put more weight on accuracy than on flexibility. A
quick exploitation of the princomp would yield the attached "flexible
prcomp" code.

prcomp is more flexible at least in one point: it can handle data with
less units than variables.

cheers, jari oksanen

-- 
Jari Oksanen <jarioksa@sun3.oulu.fi>



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