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st: warning after areg

From   Urmi Bhattacharya <>
Subject   st: warning after areg
Date   Tue, 30 Mar 2010 18:31:55 -0400


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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