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la_svd
2009 Nov 25
1
which to trust...princomp() or prcomp() or neither?
...s I see:
Using prcomp(USArrests)
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Standard deviations:
[1] 83.732400 14.212402 6.489426 2.482790
Using princomp(USArrests)
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Comp.1 Comp.2 Comp.3 Comp.4
82.890847 14.069560 6.424204 2.457837
Using my custom pca_svd() --- (my PCA method using native R svd() function):
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$stdev
[1] 82.890847 14.069560 6.424204 2.457837
Using my custom pca_cov() --- (my PCA method using native R cov() and eigen() functions):
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$sdev
[...