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Re: st: xtpmg command
From
Biljana Jonoska <[email protected]>
To
[email protected]
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: [email protected]
> 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 <[email protected]>:
> >> 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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> >>
> >
> > *
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> > * http://www.ats.ucla.edu/stat/stata/
> >
>
>
> *
> * For searches and help try:
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> * http://www.stata.com/support/statalist/faq
> * http://www.ats.ucla.edu/stat/stata/
>
*
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