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Re: st: xtpmg command


From   Biljana Jonoska <biljanajonoska@yahoo.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: xtpmg command
Date   Sat, 17 Sep 2011 12:07:31 -0700 (PDT)

Hi,
I would make an suggestion to check whether each of the panel units has 
its own unique identification. Some records could be left without assigned proper identification.

> To: statalist@hsphsun2.harvard.ed
> Date: Saturday, September 17, 2011, 9:07 AM
> > Thank you Sami, I tried appr the
> problem continues.
> 
> 
> use the difficult option or change the algorithm option to
> another
> > than the default.
> >
> > 2011/9/16  <dyolcu@metu.edu.tr>:
> >> Hi,
> >> I'm trying to use Pesaran's pooled mean group
> estimator (with xtpmg
> >> command) for my unbalanced panel of N=125 T=50.
> For my baseline
> >> regression
> >> (with one regressor), I am getting the error of
> "could not calculate
> >> numerical derivatives ,flat or discontinuous
> region encountered". When I
> >> increased the number of regressors, this time
> stata can not terminate
> >> the
> >> iteration since the likelihood function is not
> concave.
> >> How can I solve this problem?
> >>
> >> Best regard,
> >> Duygu
> >>
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