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| From | Muhammad Anees <anees@aneconomist.com> |
| To | statalist@hsphsun2.harvard.edu |
| Subject | Re: st: checking over dispersion in XTPOISSON |
| Date | Sat, 7 Jan 2012 10:29:03 +0500 |
Sorry for picking late again. I would recommend reading the Negative Binomial Regression by Joseph Hilbe and James Hardin of the Cambridge University Publishing. It contains much of the details about count data modelling and related issues. Also you can download the extension to the Book freely from Hilbe's webpages. Also stata codes and ado are given from the links given below. http://works.bepress.com/joseph_hilbe/16/ http://works.bepress.com/joseph_hilbe/ I hope this gives you answers to all your querries as I have found answers to most of my querries from Hilbe's work. Thanks to Nick Cox for guiding me firstly to these resources by hinting to use xtnbreg and other ados, Joseph Hilbe, James Hardin and others to make my count data practice easier. Good Luck Raja. Anees On Fri, Jan 6, 2012 at 8:07 PM, Eric N <eric.erictor@gmail.com> wrote: > One of the problems with Poisson is that the variance is assumed to > equal the mean which is a very restriction condition. You might wish > to try the negative binomial that also is used to analyze count data > and is less restrictive in this regard. > > --Eric > > On 1/5/12, Rajaram Subramanian Potty <rajara999@gmail.com> wrote: >> Dear all, >> >> I would like to know how one should check for overdispersion in a >> model fitted using "xtpoisson". If one noticed overdispersion how to >> correct it or which is the alternative analysis. >> >> Thanks in advance. >> >> >> RAJARAM >> * >> * 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/ -- 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/