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st: RE: Principal Component Analysis accounting for clustering
From
Nick Cox <[email protected]>
To
"'[email protected]'" <[email protected]>
Subject
st: RE: Principal Component Analysis accounting for clustering
Date
Tue, 19 Jun 2012 18:41:04 +0100
Yes; that's wrong.
First, -pca- has no -cluster()- option. It's not clear why you thought there was one.
Second, what would "accounting for clustering" look like? In PCA, at least as handled in Stata, there is no question of estimation or error structure as the PCA is just a mathematical transformation of the data.
You may have in mind some flavour of factor analysis, and it may be that -sem- offers more of what you want.
Nick
[email protected]
Armen Martirosyan
i am doing Principal Component Analysis (PCA) but would like to also
account for clustering. So when i write the following syntax
pca var 1 var 2 var 3 var n, cluster (cluster variable) i am getting
"option cluster not allowed". am i doing something wrong or it is just
impossible to account for clustering in PCA?
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