--- Gao Liu <[email protected]> wrote:
> I like the idea of adding important state-wide variables, although
> some may still argue that some state-wide effects may never be
> observed but have significant impacts.
For that case you can use the random effects model, as I suggested
earlier: http://www.stata.com/statalist/archive/2007-08/msg00076.html
Hope this helps,
Maarten
-----------------------------------------
Maarten L. Buis
Department of Social Research Methodology
Vrije Universiteit Amsterdam
Boelelaan 1081
1081 HV Amsterdam
The Netherlands
visiting address:
Buitenveldertselaan 3 (Metropolitan), room Z434
+31 20 5986715
http://home.fsw.vu.nl/m.buis/
-----------------------------------------
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