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st: RE: warning after areg

From   "Martin Weiss" <>
To   <>
Subject   st: RE: warning after areg
Date   Wed, 31 Mar 2010 00:36:23 +0200



-----Original Message-----
[] On Behalf Of Urmi Bhattacharya
Sent: Mittwoch, 31. März 2010 00:32
Subject: st: warning after areg


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?


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