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

To |
statalist@hsphsun2.harvard.edu |

Subject |
Re: st: Re: A fractional logit can't converge. Anyway, backed up results are useful for mfx? how? |

Date |
Thu, 8 Mar 2012 14:29:11 +0100 |

On Thu, Mar 8, 2012 at 1:14 PM, Roger Cremades Rodeja <ecosafor@gmail.com> wrote: > I am using fractional tobit "glm depvar indepvar, link(logit) > family(binomial) vce(robust)". I successfully used it in other two models, > but in this case after some iterations Stata says "backed up" and cannot > converge, then I create a table with the results (outreg), and still appears > a resulting table with results that are consistent with my other two models, > do those results makes statistical sense? They make no sense, so don't look at them and certainly don't try to publish anything with them. > I want to create then elasticities with "mfx" but I can't because the > model did not converge, if those results produced with outreg (previous > line) make a bit of sense, how can I create elasticities with them using > Stata? Don't do that. > Also, after typing the command appear "note: perc_mod_com has noninteger > values", I do not understand why, as I think proportion variables should be > 0 to 1. That message makes sense: remember that -glm- is a general purpose program that can be "tricked" into estimating a fractional logit. > Following previous emails in Statalist, I tried delete some > variables and I still couldn't solve it, OLS do not reject any variable, the > model do not work trying to delete indep variables one by one, and I am > trying more and more combinations, but it still does not work. I would look for some form of perfect prediction. This becomes more likely if you have a very large spike in the dependent variable (typically at 0 or 1) or a small sample size. > Please somebody knows if this analysis can be carried on using another > sofware? I need these results.. I think it is a problem with your data not your software. -- 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: Re: A fractional logit can't converge. Anyway, backed up results are useful for mfx? how?***From:*Roger Cremades Rodeja <ecosafor@gmail.com>

**References**:**st: Re: A fractional logit can't converge. Anyway, backed up results are useful for mfx? how?***From:*Roger Cremades Rodeja <ecosafor@gmail.com>

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