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st: RE: warning after areg


From   "Martin Weiss" <martin.weiss1@gmx.de>
To   <statalist@hsphsun2.harvard.edu>
Subject   st: RE: warning after areg
Date   Wed, 31 Mar 2010 00:36:23 +0200

<>

http://www.stata.com/statalist/archive/2008-01/msg00980.html




HTH
Martin


-----Original Message-----
From: owner-statalist@hsphsun2.harvard.edu
[mailto:owner-statalist@hsphsun2.harvard.edu] On Behalf Of Urmi Bhattacharya
Sent: Mittwoch, 31. März 2010 00:32
To: statalist@hsphsun2.harvard.edu
Subject: st: warning after areg

Hi,

I am running the following regression

areg fullschool i.female i.eldstchild i.birthorder i.age
i.female#i.eldstchild,absorb (hhid) vce(cluster hhid)

and i get the following warning

Warning:  variance matrix is nonsymmetric or highly singular

I am unsure as to what could be causing this.

Any ideas?

Thanks

Urmi
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