Thanks everyone,
Paul
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pgseye wrote:
After doing a PCA using princomp, how do you view how much each component
contributes to variance in the dataset. I'm still quite new to the theory of
PCA - I have a little idea about eigenvectors and eigenvalues (these
determine the variance explained?). Are the eigenvalues related
lf Of pgseye
Sent: Tuesday, September 09, 2008 5:39 AM
To: r-help@r-project.org
Subject: [R] PCA and % variance explained
After doing a PCA using princomp, how do you view how much each
component contributes to variance in the dataset. I'm still quite new to
the theory of PCA - I have a little
After doing a PCA using princomp, how do you view how much each component
contributes to variance in the dataset. I'm still quite new to the theory of
PCA - I have a little idea about eigenvectors and eigenvalues (these
determine the variance explained?). Are the eigenvalues related to loadings
in
Hi Paul,
>> how do you view how much each component contributes to variance in the
>> dataset ...
It helps to read the help:
?princomp
?prcomp
Contributions to inertia or variance are reported as standard deviations
(princomp.obj$sdev). So square these values to get the variance accounted
for
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