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Re: st: negative hausman statistic after sigmamore


From   "Mark Dincecco" <m.dincecco@imtlucca.it>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: negative hausman statistic after sigmamore
Date   Tue, 5 Aug 2008 19:24:10 +0200

Dear Austin,

Thanks very much for your response. I also thought to use xtoverid,
but unfortunately the procedure that I must use, xtpmg (which employs
pooled mean-group estimator  la Pesaran, Shin, and Smith (1999) for
non-stationary heterogenous panel data sets) does not support it.

Hence, I am stuck!

Sincerely,
Mark

On Tue, Aug 5, 2008 at 7:01 PM, Austin Nichols <austinnichols@gmail.com> wrote:
> Mark--
> Try using -xtoverid-
> (view http://fmwww.bc.edu/RePEc/bocode/x/xtoverid.hlp
> for a preview):
>
>  ssc inst xtoverid, replace
>  webuse abdata
>  xtreg n w k if year>=1978 & year<=1982, re
>  xtoverid
>  di r(j)
>  est store re
>  xtreg n w k if year>=1978 & year<=1982, fe
>  est store fe
>  hausman fe re, sigmaless
>  di r(chi2)
>
>
> On 8/5/08, Mark Dincecco <m.dincecco@imtlucca.it> wrote:
>> Dear all,
>>
>> I am running xtpmg regressions for mg and pmg. The problem is that
>> when I run (hausman mg pmg, sigmamore), even using the (sigmamore)
>> option, a negative test statistic is returned.
>>
>> In a 1984 Econometric article (p. 1226), Hausman and McFadden
>> interpret a negative H score as strong evidence of failure to reject
>> the null hypothesis that the difference in coefficient values is not
>> systematic.
>>
>> My question is: Is there anything else I can or should try to do to
>> produce a positive H statistic? Before I take the negative H score as
>> evidence that IIA holds, I would like to be sure that I am not missing
>> something obvious.
>>
>> Thanks very much. Your suggestions are be greatly appreciated.
>>
>> Sincerely,
>> Mark
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