--- On Wed, 14/7/10, Maarten buis wrote:
> either the individual dummies aren't correctly created
> or the variables that are supposed to be constant within
> the individual aren't constant.
A useful tool for checking that is -xtsum-.
Hope this helps,
Maarten
--------------------------
Maarten L. Buis
Institut fuer Soziologie
Universitaet Tuebingen
Wilhelmstrasse 36
72074 Tuebingen
Germany
http://www.maartenbuis.nl
--------------------------
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