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RE: st: Hansen's statistic with xtabond, robust?
Thanks a lot. I'll have a closer look at xtabond2.
> -----Original Message-----
> From: firstname.lastname@example.org
> [mailto:email@example.com] On Behalf Of
> Mark Schaffer
> Sent: Wednesday, August 25, 2004 9:59 AM
> To: firstname.lastname@example.org
> Subject: Re: st: Hansen's statistic with xtabond, robust?
> Subject: st: Hansen's statistic with xtabond, robust?
> Date sent: Tue, 24 Aug 2004 17:43:00 -0400
> From: "Salvati, Jean" <JSalvati@imf.org>
> To: <email@example.com>
> Send reply to: firstname.lastname@example.org
> > Hi Everybody,
> > I understand why xtabond doesn't report the Sargan
> statistic with the
> > robust option. But what about the Hansen statistic? Is it
> computed and
> > saved instead of the Sargan statistic when robust is used?
> If not, why
> > is that?
> I can't think of a good reason why not. David Roodman's
> -xtabond2-, when it does the equivalent regression as
> -xtabond- with -robust-, does report a Hansen statistic.
> BTW, when they report the results of a -twostep- estimation
> (which is also "robust"), -xtabond- follows Arellano-Bond and
> calls the overid stat a "Sargan test", whereas -xtabond2-
> uses what I think is the probably the more common convention
> and calls it a "Hansen test".
> > Isn't Hansen's statistic still valid (known to be chi2) in Arellano
> > and Bond's model with non-iid errors?
> > Thanks a lot.
> > Jean Salvati
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> Prof. Mark E. Schaffer
> Centre for Economic Reform and Transformation Department of
> Economics School of Management & Languages Heriot-Watt
> University, Edinburgh EH14 4AS UK
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