Re: st: xtpmg command

[Sami Alameen <samialameen@gmail.com>]

Or you might check if there are gaps in the panels, try a set some
other variables from the same data set to see if there is a problem
with particular variables!

On Sat, Sep 17, 2011 at 10:07 PM, Biljana Jonoska
<biljanajonoska@yahoo.com> wrote:
> 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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>
> *
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