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

To |
statalist@hsphsun2.harvard.edu |

Subject |
Re: st: zoib |

Date |
Mon, 31 Oct 2011 16:48:31 +0100 |

On Mon, Oct 31, 2011 at 3:08 PM, Jet wrote: > Hello, Maarten and other experts in zoib regression for proportion outcomes: Remember, that you _must_ say where you got a user written program from. This is not some silly rule, it is in your own interest, as it makes your question answerable, and I guess you want to ask an answerable question. I am assuming you are referring to -zoib- available from SSC. > For the 0<DV<1 model, do we interpret the exp(B) as changes in odds > ratio (in having value of 1) or changes in proportion? Neither, it is similar but not the same as an odds ratio. I called that statistic relative proportion ratios, a description can be found in -help betafit-, which is also available from SSC. > For the > estimated margins in the post-estimation function [predict(prcond)], > do we interpret the ouptut as the predicted proportion or probability? prcond, refers to the proportion conditional on being more than 0 and less than 1. If you want the probability of getting a 0 or 1 you choose pr0 or pr1 respectively. However, in both cases you are interpreting your results conditional on not being a 0 or 1, and I would expect that that in most cases makes no sense whatsoever. I would (almost) always use -predict(proportion)- instead, that would tell you the effect on the proportion regardless whether it is a 0, 1, or something in between. If you are really only interested in the proportions between 0 and 1, than you can just ignore all observations with 0s or 1s and analyse the model with -betafit-, it will give you exactly the same results. -zoib- only makes sense when you do not want to ignore the 0s and 1s. 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/

**Follow-Ups**:**Re: st: zoib***From:*Jet <lsj555@gmail.com>

**References**:**st: zoib***From:*Jet <lsj555@gmail.com>

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