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st: AW: RE: FEM and GLS

From   "Martin Weiss" <>
To   <>
Subject   st: AW: RE: FEM and GLS
Date   Thu, 18 Feb 2010 14:15:18 +0100


-xttab- the variable which you suspect to be constant, and see whether the
"within Percent" column comes in at 100%.


-----Ursprüngliche Nachricht-----
[] Im Auftrag von simon nyokabi
Gesendet: Donnerstag, 18. Februar 2010 09:41
An: stata uni
Betreff: st: RE: FEM and GLS

Hello there, 
I was running a FE regression (gravity model) and i was expecting that time
invariant variables would be dropped, but they were not. What could be the
Also GLS and OLS results appear identical. What is a possible explanation
for this?
I will highly appreciate your response.
Best regards,

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