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Re: st: Test for Strict Exogeneity after FD


From   David Greenberg <dg4@nyu.edu>
To   statalist@hsphsun2.harvard.edu, LukasBork@hotmail.com
Subject   Re: st: Test for Strict Exogeneity after FD
Date   Sun, 20 May 2012 20:35:38 -0400

Could you supply a complete citation for Felbermayr, Jung 2002? Thank
yhou, David Greenberg, Sociology Department, New York University

On Sat, May 19, 2012 at 8:57 AM, Lukas Borkowski <LukasBork@hotmail.com> wrote:
> Dear Foly,
>
> thanks for your reply - but I figured it out - and the solution might be interesting for some others as well, so I give a quick explanation. After regressing the first-differenced equation, I wanted to check if differencing had solved the endogeneity concern, thus if the strict exogeneity assumption would hold. As Wooldridge (2002, p.285f) suggests, it is quite easy to run this test if your panel has just two time periods - you do not even have to run the hausman test. All what you need is to include one or several of your explanatory variables in your first-differenced equation and to carry out a F-test for significance of these included variables. Failing to reject the null means that differencing has solved the endogeneity concern. Check "Felbermayr, Jung 2002: The pro-trade effect of the brain drain: Sorting out confounding factors" for an example.
>
>
> #
> Lukas Borkowski
>
>
>
> Am 19.05.2012 um 14:33 schrieb Foly Ananou:
>
>>  Dear Lukas,
>>  Can U explain how u are trying to run the test on stata ? ? May Be
>>  knowing what u have tried, we could be able to give some suitable
>>  answer.
>>  Thx.
>>  Foly Ananou
>>
>>
>>
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>>>> From: LukasBork@hotmail.com
>>>> Subject: st: Test for Strict Exogeneity after FD
>>>> Date: Sat, 19 May 2012 11:37:19 +0200
>>>> To: statalist@hsphsun2.harvard.edu
>>>>
>>>> Dear all,
>>>>
>>>> I am using Stata 11.2.
>>>>
>>>> I am working on panel data with just two time periods and applied
>>> first-differencing to compute a FD-estimator. In Wooldridge (2002):
>>> Econometric Analysis of cross-section and panel data, page 285 I came
>>> across a very appealing way to somehow run the hausman test after FD to
>>> test for strict exogeneity. However, after trying for ages, I do still
>>> not know how to do that in Stata.
>>>>
>>>> My question is: How do I test for strict exogeneity (via Hausman or
>>> elsewise) after running FD? What is the command?
>>>>
>>>> Thank you so much for your help!
>>>>
>>>>
>>>> #
>>>> Lukas Borkowski
>>>>
>>>>
>>>>
>>>>
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