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st: Pooled vs. RE

From   <>
Subject   st: Pooled vs. RE
Date   Mon, 26 May 2003 10:30:53 +0200 (CEST)

Dear all,
I am trying to compare pooled, random effects and fixed effects models. 
I would like to know what test to use to test the specification between 
OLS and random effects. 
I also would like to know why in a Hausman test I get a statistic value 
0 with probability 1, is this possible? what is the interpretation? 

Thank you in advance,
Rosa Maria Martin.

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