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st: RE: Arellano-Bond and Sargan/Hansen Test

From   "Lorena Barberia" <>
To   <>
Subject   st: RE: Arellano-Bond and Sargan/Hansen Test
Date   Wed, 27 Feb 2008 11:56:40 -0300


I recommend reading the following paper by David Roodman "A Short Note on
Too Many Instruments" that is available at the following link:

His papers have been very helpful for me. 


-----Original Message-----
[] On Behalf Of ahmed al-darwish
Sent: Wednesday, February 27, 2008 11:52 AM
Subject: st: Arellano-Bond and Sargan/Hansen Test

Dear Statalisters;
 I have a question regarding the over-identification
restriction Tests(Sargan or Hansen test). When using a
DPD estimator I always get these tests' p-values
equals one (chi2=45 and p-val = 1.000); does that cast
any doubt on my estimation results or my model?!
Any suggestion or comments will be highly appreciated.



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