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From | Sami Alameen <samialameen@gmail.com> |
To | statalist@hsphsun2.harvard.edu |
Subject | Re: st: xtpmg command |
Date | Sun, 18 Sep 2011 13:45:44 +0300 |
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 >> >> >> >> * >> >> * For searches and help try: >> >> * http://www.stata.com/help.cgi?search >> >> * http://www.stata.com/support/statalist/faq >> >> * http://www.ats.ucla.edu/stat/stata/ >> >> >> > >> > * >> > * For searches and help try: >> > * http://www.stata.com/help.cgi?search >> > * http://www.stata.com/support/statalist/faq >> > * http://www.ats.ucla.edu/stat/stata/ >> > >> >> >> * >> * For searches and help try: >> * http://www.stata.com/help.cgi?search >> * http://www.stata.com/support/statalist/faq >> * http://www.ats.ucla.edu/stat/stata/ >> > > * > * For searches and help try: > * http://www.stata.com/help.cgi?search > * http://www.stata.com/support/statalist/faq > * http://www.ats.ucla.edu/stat/stata/ > * * For searches and help try: * http://www.stata.com/help.cgi?search * http://www.stata.com/support/statalist/faq * http://www.ats.ucla.edu/stat/stata/