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> -----Original Message-----
> From: email@example.com
> [mailto:firstname.lastname@example.org] On Behalf Of Hewan Belay
> Sent: Friday, July 11, 2008 2:39 AM
> To: Stata List
> Subject: st: RE: xtoverid error: internal reestimation of eqn
> differs from original
> Dear Mark,
> Thanks for the detailed thoughts on what is going on in
> xthtaylor and xtoverid. This allowed me to peer a bit more
> deeply into these commands' inner workings. In my case, I am
> not sure though if unbalancedness is the sole problem here.
> First of all, I'm not sure what you meant with unbalanced.
A "balanced panel" is one where the number of observations per group is
the same. You have an "unbalanced panel": some groups have as few as 7
observations, others have as many as 9. My suggestion was to reestimate
on a balanced panel to see if the problem goes away. Since almost all
your groups have 9 observations, probably you just drop all the groups
with fewer than 9 and see what happens.
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