Have you ever read the help pages? It tells you:
"Note
The signs of the columns of the loadings and scores are arbitrary,
and so may differ between different programs for PCA, and even
between different builds of R."
Also the references given on ?princomp are really worth reading...
Best,
Uwe Ligges
On 16.05.2011 07:44, Ooi Wen Fong wrote:
Hi.
I was comparing the components from princomp's loadings and the eigen given
the same input.
I found that the sign of componenets (+/-) are opposite between the two
components (from princmop and eigen) but the magnitudes are identical. Why?
Thanks!
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