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From |
Stas Kolenikov <skolenik@gmail.com> |

To |
statalist@hsphsun2.harvard.edu |

Subject |
Re: st: which -cmp- option to use for poisson model with count data? |

Date |
Mon, 30 Apr 2012 09:54:29 -0500 |

You could try to harness -gllamm- to do it. You could still use -cmp- as a crude working model approximation, being aware that an ordinal regression is a poor substitute for Poisson model. (Not that I disagree with David, the respected author of -cmp-, but it does look tempting to run it this way). On Mon, Apr 30, 2012 at 9:32 AM, Laura R. <laura.roh@googlemail.com> wrote: > Dear David, > > I have a dependent count variable ranging from 0 to 5. It's a pity > that this cannot be estimated with -cmp-. > > Does anyone know a similar model with a two-equation-system where one > is poisson regression (for count data), the other one is probit? > > Laura > > > > 2012/4/30 David Roodman (droodman@cgdev.org) <DRoodman@cgdev.org>: >> Laura, I'm afraid cmp is probably not appropriate. Unless the counts are high, count data can't be realistically modeled as the outcome of a single underlying process consisting of a linear functional plus a normally distributed error. >> >> The truncated regression model is intended for the same kinds of outcomes as Stata's truncreg command--one's with a continuous but truncated outcome. >> >> --David >> >> ------------------ >> >> From "Laura R." <laura.roh@googlemail.com> >> To statalist@hsphsun2.harvard.edu >> Subject st: which -cmp- option to use for poisson model with count data? >> Date Fri, 27 Apr 2012 20:16:46 +0200 >> Dear Stata users >> >> Can -cmp- be used with count data, which would normally be estimated >> using -poisson- in Stata? For example, the number of experts, ranging >> from 0 to 5 in the data (but theoretically limited to >0) . >> >> As this variable would be truncated (at 0, right truncated), I suppose >> I should use the option -indicator($cmp_trunc)- when using -cmp-? >> >> For example >> >> *---------------------------- Stata example begin--------------------- >> >> cmp (experts=x1 x2 x3, trunc(0 .)), indicators($cmp_trunc) >> >> *------------------------- Stata example end------------------------ >> >> would this be correct? >> >> Thank you very much for your consideration. >> >> Laura >> >> >> * >> * 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/ -- Stas Kolenikov, also found at http://stas.kolenikov.name Small print: I use this email account for mailing lists only. * * 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/

**Follow-Ups**:**Re: st: which -cmp- option to use for poisson model with count data?***From:*Austin Nichols <austinnichols@gmail.com>

**References**:**RE: st: which -cmp- option to use for poisson model with count data?***From:*"David Roodman (droodman@cgdev.org)" <DRoodman@cgdev.org>

**Re: st: which -cmp- option to use for poisson model with count data?***From:*"Laura R." <laura.roh@googlemail.com>

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