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From |
Maarten Buis <maartenlbuis@gmail.com> |

To |
statalist@hsphsun2.harvard.edu |

Subject |
Re: st: When to use Poisson or Negative Binomial |

Date |
Fri, 27 May 2011 13:56:29 +0200 |

On Fri, May 27, 2011 at 1:34 PM, Querze, Alana Renee <arq@ku.edu> wrote: > @Maarten: what else do I need to know besides the marginal mean and variance to choose the right command? I chose between random and fixed effects by using the Hausman test... is there a similar test in STATA that would help me know which model better fits the data? One thing you can do look at the logic underlying each model. In this case they would imply different stories for what is happening at the 0 counts. Compare those stories with what you know about your problem and decide which one makes more sense for your situation. Another thing you can do is look at the residuals. I do not think that statistical tests are the right way for selecting models, the logics underlying statistical testing and model selection are just too different. When it comes to model selection we want our model to be useful simplification of reality, which paradoxically means that true models are either bad models (they don't simplify enough) or useless (the situation does not require simplification). The tradeoff is all about simplifying enough so that we understand the results and not simplifying too much so we won't make too many errors. Statistical testing is all about the probability of rejecting a true statement. The tradeoff is all about the probability of rejecting a true statement and the probability of not rejecting a false statement. It is hard to see how one tradeoff can say something useful about the other. Hope this helps, Maarten -------------------------- Maarten L. Buis Institut fuer Soziologie Universitaet Tuebingen Wilhelmstrasse 36 72074 Tuebingen Germany http://www.maartenbuis.nl -------------------------- * * 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: When to use Poisson or Negative Binomial***From:*"Querze, Alana Renee" <arq@ku.edu>

**Re: st: When to use Poisson or Negative Binomial***From:*Argyn Kuketayev <akuketayev@mail.primaticsfinancial.com>

**Re: st: When to use Poisson or Negative Binomial***From:*Maarten Buis <maartenlbuis@gmail.com>

**RE: st: When to use Poisson or Negative Binomial***From:*"Querze, Alana Renee" <arq@ku.edu>

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