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RE: st: Hausman test


From   Maarten buis <[email protected]>
To   [email protected]
Subject   RE: st: Hausman test
Date   Sun, 25 Dec 2005 10:22:41 +0000 (GMT)

Thanks Marcello and Kit. In my zeal to explain this stuff in a non-technical way, I became too
sloppy. 

Maarten


at za 12/24/2005 8:20 Christopher Baum wrote:
> The original statement should read "when you form the 
> expression V_r - V_e, the resulting matrix is p.d., implying 
> that it has all positive principal minors." That also implies 
> that all of the DIAGONAL elements of that matrix are strictly 
> positive, but it does not restrict the off-diagonal elements 
> from being negative -- it merely means they cannot be 'too 
> large'.
> 
> The original point regarding the sampling error of coeff. 
> estimates should be thought of as "if the estimated variance 
> of b_1 is larger in the "efficient" model than in the "robust" 
> model, the corresponding element on the diagonal of V_r - V_e 
> will be negative, and Stata will complain..."



		
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