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Re: st: factormat STATA 10

From   Anders Alexandersson <>
Subject   Re: st: factormat STATA 10
Date   Tue, 21 Sep 2010 12:08:53 -0400

I would think that 4 observations are too few for factor analysis
regardless of the size of the underlying matrix.
What would be a meaningful result of factor analysis with 4 observations?
Maybe you instead want to use a 4*4 matrix with 88 observations, that
is, with option n(88)?


On Mon, Sep 20, 2010 at 12:22 PM,  <> wrote:
This is regarding factormat. I have an 88 by 88 co-variance matrix. In the
> n(#) I input n(4) as I have a panel of 88 firms and 4 years. I get the error
> message about too few observations.
> Is there anything I can do to get STATA to perform the factor analysis? If
> not, can someone point out exactly where STATA fails (e.g. is there a matrix
> that it cannot invert) so that I can figure a way around it. I went to the
> Stata 10 manual and it did not have any formulas for factor mat.
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