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RE: st: RE: RE: Xtivreg2


From   "Schaffer, Mark E" <M.E.Schaffer@hw.ac.uk>
To   <statalist@hsphsun2.harvard.edu>
Subject   RE: st: RE: RE: Xtivreg2
Date   Mon, 3 Apr 2006 14:52:32 +0100

Max,

That explains it.  This question comes up from time to time on Statalist.  Here is one of the more recent threads:

http://www.stata.com/statalist/archive/2006-03/msg00434.html 

Cheers,
Mark

> -----Original Message-----
> From: owner-statalist@hsphsun2.harvard.edu 
> [mailto:owner-statalist@hsphsun2.harvard.edu] On Behalf Of 
> Max Steinhardt
> Sent: 03 April 2006 14:10
> To: statalist@hsphsun2.harvard.edu
> Subject: RE: st: RE: RE: Xtivreg2
> 
> Mark,
> sorry,
> i wrote down the reduced form of my equation,because i thougt 
> this would be adequate.  but in the original form my equation 
> has more regressors than clusters.after your reply i tried to 
> estimate the reduced form and there is no error message any 
> more.so the problem should be that the numbers of regressors 
> is bigger than the number of clusters,although i have 1900 
> observations.
> Max
> 
> 
> 
> 
> >
>  --- Ursprüngliche Nachricht ---
> > Von: "Max Steinhardt" <kosak@gmx.de>
> > An: statalist@hsphsun2.harvard.edu
> > Betreff: RE: st: RE: RE: Xtivreg2
> > Datum: Mon, 3 Apr 2006 14:59:26 +0200 (MEST)
> > 
> > - yes,in this reduced form equation are only 25 regressors.
> > -when i drop weights,i receive the same error message.
> > Max>
> > 
> > 
> >  --- Ursprüngliche Nachricht ---
> > > Von: "Schaffer, Mark E" <M.E.Schaffer@hw.ac.uk>
> > > An: <statalist@hsphsun2.harvard.edu>
> > > Betreff: RE: st: RE: RE: Xtivreg2
> > > Datum: Mon, 3 Apr 2006 13:51:48 +0100
> > > 
> > > Max,
> > > 
> > > That looks like it might be a bug.  Am I correct to think 
> that there 
> > > are only 25 regressors?
> > > 
> > > One other question - what happens if you omit the weight command?
> > > 
> > > --Mark
> > > 
> > > > -----Original Message-----
> > > > From: owner-statalist@hsphsun2.harvard.edu
> > > > [mailto:owner-statalist@hsphsun2.harvard.edu] On Behalf Of 
> > > > kosak@gmx.de
> > > > Sent: 03 April 2006 13:34
> > > > To: statalist@hsphsun2.harvard.edu
> > > > Subject: Re: st: RE: RE: Xtivreg2
> > > > 
> > > > o.k.
> > > > 
> > > > the exact command is:
> > > > 
> > > > xtivreg2 wage  bild aerfahrung d_ajahr1- d_ajahr23 
> > > > [aweight=weight],fe
> > > > i(region) t(ajahr) robust cluster (region)
> > > > 
> > > > wage: average wage per region
> > > > number of regions:72
> > > > number of observations:1900
> > > > error message:number of clusters must be greater than number of 
> > > > instruments
> > > > 
> > > > Best,
> > > > Max
> > > > 
> > 
> > --
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