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Re: st: GLS in STATA


From   "Clive Nicholas" <Clive.Nicholas@newcastle.ac.uk>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: GLS in STATA
Date   Tue, 29 Jun 2004 22:34:26 +0100 (BST)

Rijo John wrote:

> Is there a simple way to do Generalised Least squares in STATA?

The default -xtreg- command fits random-effects GLS models. -xtgls- fits
cross-sectional time-series FGLS regressions.

> The robust option along with the _regress_ is not equivallant to doing a
> GLS right? So appart from doing GLS as below is there a simple command
> which does the job?
>
> regress depvar x1.... xk
> predict e, residual
> generate esq = e^ 2
> regress esq x1.... xk
> predict v
> regress depvar x1.... xk [aweight = 1/v]
>
> [This is a feasible GLS estimation or feasible weighted least sqares
> estimation]

Looks like WLS to me, which you can fit with rather less hassle by

. xtreg y x1 x2 xk, be wls

which gives you the 'between-effects' model. See -whelp xtreg- for more.

CLIVE NICHOLAS        |t: 0(044)191 222 5969
Politics              |e: clive.nicholas@ncl.ac.uk
Newcastle University  |http://www.ncl.ac.uk/geps
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