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From |
"Justina Fischer" <JAVFischer@gmx.de> |

To |
statalist@hsphsun2.harvard.edu |

Subject |
Re: st: What should I do if stata can not show the result of nbreg |

Date |
Sun, 08 Jan 2012 16:32:10 +0100 |

Hi Yes Sun, usually (from my experience), nbreg needs about 7 iterations to converge. One reason for non-convergence could be a high collinearity among variables. So try with a more parsimonous model and find out which independent variable causes the problem. Justina -------- Original-Nachricht -------- > Datum: Sun, 8 Jan 2012 21:25:56 +0800 > Von: Ye SUN <sunye74stata@gmail.com> > An: statalist@hsphsun2.harvard.edu > Betreff: Re: st: What should I do if stata can not show the result of nbreg > Thanks for reminding. > I use stata 11. My dependent variable is the number of boards that a > director serves in.(Nboards) My test independent variable is the > gender of the director, dummy variable (FD). > So I want to run the following regression: nbreg Nboards FD (other > control variables) > > I input the above command in stata, but it runs for hours and keeps > showing > > Iteration 50: log likelihood = -58271.444 (backed up) > numerical derivatives are approximate > flat or discontinuous region encountered > Iteration 51: log likelihood = -58271.444 (backed up) > numerical derivatives are approximate > flat or discontinuous region encountered > Iteration 52: log likelihood = -58271.444 (backed up) > numerical derivatives are approximate > flat or discontinuous region encountered > Iteration 53: log likelihood = -58271.444 (backed up) > > I want to know how to solve this problem if it still can not show the > final results. > > I also want to know what is the difference between the command -nbreg- > and -nbinreg-, please? It seems both of them are used for negative > binomial regression. > > Thanks a lot > > SUN Ye > > > On Sun, Jan 8, 2012 at 4:36 PM, Muhammad Anees <anees@aneconomist.com> > wrote: > > A little picture of what you really did with -nbreg- will help us > > understand your problem and also indicate what version of Stata is > > used. > > > > On Sun, Jan 8, 2012 at 1:24 PM, Ye SUN <sunye74stata@gmail.com> wrote: > >> Dear all > >> My dependent variable is count number: the number of boards that a > >> director serves in (this kind of data seems not fit to poisson) > >> > >> I first try poisson regression and get the results and then I try > >> -estat gof- to test whether there is overdispersion problem, it is > >> insignificant indicating no overdispersion problem I think. > >> I also try -zip- and get similar results, and vuong test indicates > >> there is no excess zero problems I think. > >> > >> I also want to try negative binomial regression,( nbreg and zinb ), > >> but stata run for quite a long time and still run without showing any > >> results. What does that mean? Dose it mean that nbreg is inappropriate > >> here? > >> > >> I want to ask, if -estat gof- after -poisson- shows the insignificant > >> results, can I say this poisson model is OK and do not need to provide > >> negative binomial regression results? > >> > >> Thanks for your help! > >> > >> SUN Ye > >> * > >> * 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/ > > > > > > > > -- > > > > Best > > --------------------------- > > Muhammad Anees > > Assistant Professor/Programme Coordinator > > COMSATS Institute of Information Technology > > Attock 43600, Pakistan > > http://www.aneconomist.com > > > > * > > * 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/ -- Justina AV Fischer, PhD COFIT Fellow World Trade Institute University of Bern homepage: http://www.justinaavfischer.de/ e-mail: javfischer@gmx.de. justina.fischer@wti.org papers: http://ideas.repec.org/e/pfi55.html * * 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/

**References**:**st: What should I do if stata can not show the result of nbreg***From:*Ye SUN <sunye74stata@gmail.com>

**Re: st: What should I do if stata can not show the result of nbreg***From:*Muhammad Anees <anees@aneconomist.com>

**Re: st: What should I do if stata can not show the result of nbreg***From:*Ye SUN <sunye74stata@gmail.com>

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