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Re: st: xtivreg2


From   "Andrea Molinari" <A.Molinari@sussex.ac.uk>
To   <statalist@hsphsun2.harvard.edu>
Subject   Re: st: xtivreg2
Date   Wed, 16 Nov 2005 23:06:24 -0000

Mark,

Thanks for your suggestion. Just to clarify your point, do you mean that in
my case I should run::

xtivreg2 $text lrectextg dbrcatext lreptextg (= l.lrgdp95pcx l.lreptextg),
fe first orthog(lreptextg)

And in a case of having more than one potentially endogenous regressor,
would it be valid to run this test for each of those regressors (or pairs of
them) like this?:

xtivreg2 $paper lreppaperg lrecpaperg dbrcapaper (= l.lrgdp95pcx
l2.lrgdp95pcx l.brcapaper l.lreppaperg l2.lreppaperg l.lrgdp95pcm
l.lrecpaperg), fe first orthog(lreppaperg)

xtivreg2 $paper lreppaperg lrecpaperg dbrcapaper (= l.lrgdp95pcx
l2.lrgdp95pcx l.brcapaper l.lreppaperg l2.lreppaperg l.lrgdp95pcm
l.lrecpaperg), fe first orthog(lrecpaperg)

xtivreg2 $paper lreppaperg lrecpaperg dbrcapaper (= l.lrgdp95pcx
l2.lrgdp95pcx l.brcapaper l.lreppaperg l2.lreppaperg l.lrgdp95pcm
l.lrecpaperg), fe first orthog(lreppaperg lrecpaperg)

...and so on

I checked and results (e.g. on Sargan) seem similar, but I'm not too sure
STATA is understanding which variables do I believe are endogenous in these
statements?

Many thanks again!
Andrea

----- Original Message ----- 
From: "Mark Schaffer" <M.E.Schaffer@hw.ac.uk>
To: <statalist@hsphsun2.harvard.edu>
Sent: Wednesday, November 16, 2005 5:47 PM
Subject: Re: st: xtivreg2


> Andrea,
>
> -ivendog- isn't equipped (yet?) to handle -xtivreg2-.
>
> However, you have an easy alternative, which is to use the -orthog()-
> option of -xtivreg2- to conduct your endogeneity tests.  Check out
> the help file examples of -ivreg2-, and you'll see an example in the
> list of how to mimic a Durbin-Wu-Hausman endogeneity test using this
> option.
>
> Cheers,
> Mark
>
> From:           "Andrea Molinari" <A.Molinari@sussex.ac.uk>
> To:             <statalist@hsphsun2.harvard.edu>
> Subject:        st: xtivreg2
> Date sent:      Wed, 16 Nov 2005 16:07:08 -0000
> Send reply to:  statalist@hsphsun2.harvard.edu
>
> > Dear Statalisters,
> >
> > I'm using the new -xtivreg2- command for FE IV, with the following
equation:
> >
> > xtivreg2 $text lrectextg dbrcatext (lreptextg = l.lrgdp95pcx
l.lreptextg),
> > fe first
> >
> > This works fine, but when I try to run the -ivendog- command to check
for
> > the regressor's endogeneity, I get the following error message:
> >
> > ivendog lrectextg
> >
> > ivendog works only after ivreg, ivreg2; use dmexogxt after xtivreg
> > last estimates not found
> > r(301);
> >
> > I then installed -dmexogxt- and tried:
> >
> > dmexogxt lreptextg
> >
> > but got the following error:
> >
> > dmexogxt only works after xtivreg, fe
> > last estimates not found
> > r(301);
> >
> > Something similar seems to occur when I try to use the -overid, all-
> > command, although for me this is not essential, I only use it as a
check.
> >
> > Does anyone have any suggestions as of what test (and command) to use
for
> > endogeneity?
> >
> > Many thanks!
> >
> > Andrea
> >
> >
> > *
> > *   For searches and help try:
> > *   http://www.stata.com/support/faqs/res/findit.html
> > *   http://www.stata.com/support/statalist/faq
> > *   http://www.ats.ucla.edu/stat/stata/
>
> Prof. Mark E. Schaffer
> Director
> Centre for Economic Reform and Transformation
> Department of Economics
> School of Management & Languages
> Heriot-Watt University, Edinburgh EH14 4AS  UK
> 44-131-451-3494 direct
> 44-131-451-3296 fax
> 44-131-451-4202 CERT administrator
> http://www.sml.hw.ac.uk/cert
>
> *
> *   For searches and help try:
> *   http://www.stata.com/support/faqs/res/findit.html
> *   http://www.stata.com/support/statalist/faq
> *   http://www.ats.ucla.edu/stat/stata/
>

*
*   For searches and help try:
*   http://www.stata.com/support/faqs/res/findit.html
*   http://www.stata.com/support/statalist/faq
*   http://www.ats.ucla.edu/stat/stata/



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