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Re: st: xtpmg command


From   dyolcu@metu.edu.tr
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: xtpmg command
Date   Sat, 17 Sep 2011 19:07:00 +0300 (EEST)

> Thank you Sami, I tried but 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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