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| From | Steve Samuels <sjsamuels@gmail.com> |
| To | statalist@hsphsun2.harvard.edu |
| Subject | Re: st: Generalized lineal models with survey data |
| Date | Tue, 27 Jul 2010 12:13:30 -0400 |
Well, I'd have to see all the output and your -svyset- statement, but it looks like the command won't compute a CI when alpha is essentially zero; the likelihood iiteration had to stop somewhere, so even the weighted likelihood value is questionable. Jackknife replicates or -brr- replicates, for example, would all give the same ( zero) estimate. Steve On Tue, Jul 27, 2010 at 11:51 AM, Paolina Medina <carmencitamedina@gmail.com> wrote: > Thank you very much Steve for your help, in fact i have tried to run > the svy: nbreg command, but i am encountering some problems, i hope > you can help me: > > This is the regression that i run: > > svy: nbreg ncels residents numradios nTVs dfixedphone delectricity > ncompus dinternet elementary highschool phd workingpeople e1 e2 e3 e4 > e5 e6 e7 e8 e9 e10 e11 e12 e13 e14 e15 e16 e17 e18 e19 e20 e21 e22 e23 > e24 e25 e26 e27 e28 e29 e30 e31 e32 estrato1 estrato2 estrato3 > estrato4, log > > I am trying to estimate coefficients for the number of cell phones in > mexican households using a technology specialized survey. I use some > socioeconomic variables, 32 dummies one for each state in mexico, and > 4 dummies indicating the size of the town. > > But in the first stage of the regresion, below the coefficients estimates i get: > > -------------+---------------------------------------------------------------- > /lnalpha | -23.93108 . . . > -------------+---------------------------------------------------------------- > alpha | 4.04e-11 . . . > ------------------------------------------------------------------------------ > Likelihood-ratio test of alpha=0: chibar2(01) = 0.00 Prob>=chibar2 = 1.000 > > > And in the survey results, below the coefficients estimates i get > > -------------+---------------------------------------------------------------- > /lnalpha | -23.93108 . . . > -------------+---------------------------------------------------------------- > alpha | 4.04e-11 . . . > ------------------------------------------------------------------------------ > > I understand that stata wont calculate the LR test for alpha when it > comes to survey data, but as you may see it is not even giving me the > confidence interval! > > Do you happen to know what is happening? > > Thank you very very much in advance! > > Regards! > > PM > > > > > > > > On Mon, Jul 26, 2010 at 10:24 PM, Steve Samuels <sjsamuels@gmail.com> wrote: >> In Version 9, -svy: nbreg- and -svy: gnbreg- will work for you. Both >> fit generalizations of the Poisson with extra dispersion. -svy: glm- >> was not available until Stata 10. >> >> Steve >> >> >> On Mon, Jul 26, 2010 at 10:00 PM, Paolina Medina >> <carmencitamedina@gmail.com> wrote: >>> Dear statalisters, >>> Is it possible to perform a regression using glm with survey data in stata 9? >>> I have count data with overdispersion (mean 1.21, variance 1.70). >>> Thank you very much in advance, >>> PM >>> * >>> * 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/ >>> >> >> >> >> -- >> Steven Samuels >> sjsamuels@gmail.com >> 18 Cantine's Island >> Saugerties NY 12477 >> USA >> Voice: 845-246-0774 >> Fax: 206-202-4783 >> >> * >> * 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/ >> > > > > -- > Paolina Medina Palma > > * > * 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/ > -- Steven Samuels sjsamuels@gmail.com 18 Cantine's Island Saugerties NY 12477 USA Voice: 845-246-0774 Fax: 206-202-4783 * * 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/