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From |
Jeremy Bowling <jlbkq6@mail.missouri.edu> |

To |
<statalist@hsphsun2.harvard.edu> |

Subject |
st: Re: Probability threshold for inclusion in ZINB count model |

Date |
Sat, 25 Feb 2012 15:23:28 -0600 |

Sent: Saturday, February 25, 2012 4:46 AM To: statalist@hsphsun2.harvard.edu Subject: Re: st: Probability threshold for inclusion in ZINB count model Perhaps you explain what threshold you expect there to be on relation to the manual entry on -zinb- or expand on how you think -zinb- should use such a threshold. Nick On 25 Feb 2012, at 05:05, Jeremy Bowling <jlbkq6@mail.missouri.edu> wrote:

I am having a hard time finding the probability threshold that zinb usesto include/limit observations in the count model. Is there a setprobability threshold? If not how do I find the threshold?After running zinb for a number of count models, I was seeking to run asimple logit model by dichotomizing my dv instead of having a count. Iwould like to limit my observations by excluding those that would be inthe certain zero group. Of course the significance of the logitcoefficients would be affected by the threshold I set (which observationsare included). I would like to use the logit model to seek not whatcauses multiple occurrences (count) but what factors lead to thelikelihood of an occurrence, from zero to one, for those observations notin the certain zero group.If there is not a set probability threshold or it can not be found, whatwould be the best probability to use? 50% cutoff? Mean probability

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**Follow-Ups**:**Re: st: Re: Probability threshold for inclusion in ZINB count model***From:*Stas Kolenikov <skolenik@gmail.com>

**References**:**st: Probability threshold for inclusion in ZINB count model***From:*Jeremy Bowling <jlbkq6@mail.missouri.edu>

**Re: st: Probability threshold for inclusion in ZINB count model***From:*Nick Cox <njcoxstata@gmail.com>

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