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st: MIME-Version: 1.0


From   hfaruq@indiana.edu
To   statalist@hsphsun2.harvard.edu
Subject   st: MIME-Version: 1.0
Date   Mon, 12 Mar 2007 13:14:44 -0400

Hi,

I'm running a fixed effect regression in STATA with some dummy
variables for countries:

xtreg variable_Y variable_X countrydummy1-countrydummyN log(population), fe

(Some observations for population are missing)

Whenever I run this regression, I get the message that:

"matrix not positive definite"

Can you please give me an idea what's going on and how I can run this
regression? Any help will be gratefully appreciated.

Thanks,
Hasan Faruq

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