[R] principal component analysis

From: David J. Netherway <david.netherway_at_adelaide.edu.au>
Date: Thu 17 Mar 2005 - 10:47:56 EST

Hello,

I have used "prcomp" and the variances for the first 3 PC's are 2.65, 1.97 and 0.38.

When I plot the principal component values for each data point I can see that the points lie in a plane as one might expect from the variances.

But this plane is diagonal through the 3D space of the first 3 PC's. My question is: is it usual to follow a PC analysis with an eigen analysis to align this plane with with 2 principal directions, or is there a way of incorporating this into "prcomp".

Thanks, David



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