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st: RE: Matrix of Eigenvalues of Correlation matrix


From   "FEIVESON, ALAN H. (AL) (JSC-SD) (NASA)" <[email protected]>
To   "'[email protected]'" <[email protected]>
Subject   st: RE: Matrix of Eigenvalues of Correlation matrix
Date   Fri, 17 Jan 2003 14:32:04 -0600

You can use matrix symeigen- to get the eigenvalues (there are just n of
them for an n x n matrix,  not a "matrix" of them) - but this will not tell
you which variables are linear combinations of which other variables. There
is no natural correspondence between eignvalues and variables.

Al Feiveson
-----Original Message-----
From: [email protected] [mailto:[email protected]]
Sent: Friday, January 17, 2003 2:07 PM
To: [email protected]
Subject: st: Matrix of Eigenvalues of Correlation matrix


Hi,

I am trying to perform a factor analysis. The correlationmatrix is
semidefinite. So I need to know which eigenvalues in the correlationmatrix
are
positive. Does anybody know hot to generate a matrix of eigenvalues of
correlation
matrices?

Thanks in advance
Andrea Kollmann

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