Notice: On March 31, it was **announced** that Statalist is moving from an email list to a **forum**. The old list will shut down at the end of May, and its replacement, **statalist.org** is already up and running.

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

From |
Nick Cox <njcoxstata@gmail.com> |

To |
statalist@hsphsun2.harvard.edu |

Subject |
Re: st: Poisson regression with score/scale as DV |

Date |
Tue, 3 Apr 2012 09:40:49 +0100 |

That's Austin Nichols' presentation. The folklore is that -poisson- works well even if the usual assumptions are not well satisfied. Furthermore, as is customary, the exact form of marginal distribution of the response is not part of the assumptions. So, I would try -poisson-. But since your response (you say DV) is also bounded, I would consider dividing by 27 and using -glm, f(binomial)-. Why stick to one model when you can try two? Nick On Tue, Apr 3, 2012 at 8:58 AM, Clinton Thompson <clintonjthompson@gmail.com> wrote: > Based on Austin Nichol's July 2010 presentation on use of Poisson for > non-negative skewed variables > (http://www.stata.com/meeting/boston10/boston10_nichols.pdf) as well > as Bill Gould's Stata blog post about the same > (http://blog.stata.com/2011/08/22/use-poisson-rather-than-regress-tell-a-friend/), > I'm considering Poisson for a problem I have, albeit the dependent > variable is different enough from their examples that I'm unsure > whether Poisson is entirely appropriate. In my problem, the DV is a > "score" assigned to each subject based on their responses to several > component (ordinal scaled) questions. This variable is bound between > zero and 27 and the distribution of responses is decidedly non-normal > (pile-up of responses at the zero value). Any thoughts on whether > Poisson is still a good candidate or should I be considering other > approaches? And if Poisson is not the right way to go, any advice on > how to model this DV? > > I'm using Stata/SE 11.2 for Windows. > * * 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: Poisson regression with score/scale as DV***From:*Clinton Thompson <clintonjthompson@gmail.com>

- Prev by Date:
**Re: st: RE: Poisson regression with score/scale as DV** - Next by Date:
**Re: st: how to parallelize Mata (or steal the performance of built-in -tab, summarize-)** - Previous by thread:
**Re: st: RE: Poisson regression with score/scale as DV** - Next by thread:
**st: filtered display or scalars?** - Index(es):