[R] extract prop. of. var in pca

From: K. Steinmann <Katharina.Steinmann_at_stud.unibas.ch>
Date: Sat 09 Jul 2005 - 04:51:12 EST


Dear R-helpers,

Using the package Lattice, I performed a PCA.

For example
pca.summary <- summary(pc.cr <- princomp(USArrests, cor = TRUE))

The Output of "pca.summary" looks as follows:

Importance of components:

                          Comp.1    Comp.2    Comp.3     Comp.4
Standard deviation     1.5748783 0.9948694 0.5971291 0.41644938
Proportion of Variance 0.6200604 0.2474413 0.0891408 0.04335752 Cumulative Proportion 0.6200604 0.8675017 0.9566425 1.00000000

How can I extract the proportion of variance?

Since names(pca.summary) or str(pca.summary) do not contain the proportion of variance,
it seems I can not use something similar like pca.summary[[2]]$Comp.1[3]. I can't see how the values are stored.

Thanks in advance.

K. St.



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