----- Forwarded message from "Maga, Murat" <ali.m...@seattlechildrens.org> -----
Date: Thu, 15 May 2014 18:54:15 -0400
From: "Maga, Murat" <ali.m...@seattlechildrens.org>
Reply-To: "Maga, Murat" <ali.m...@seattlechildrens.org>
Subject: Comparing svd() and prcomp() output from R
To: "'morphmet@morphometrics.org'" <morphmet@morphometrics.org>
Hi folks,
This is really a R question, but perhaps someone can help me.
When I run svd() and prcomp() functions on my procrustes aligned coordinates, I
end up with an interesting situation, where the 1st component from the prcomp()
is identical to the 2nd component from svd() and it keeps going with this
shift.
The first component from SVD has a large variance attached to it. If you remove
that and recalculate the percentages, they are identical to the variances
explained by prcomp.
Any ideas what's happening?
Thanks,
M
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