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From |
Nick Cox <n.j.cox@durham.ac.uk> |

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

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

Date |
Thu, 8 Mar 2012 12:40:36 +0000 |

I presume "tobit" is here a typo for "logit". Apart from that, this is often unclear and even contradictory, e.g. over whether you used one predictor or several. I have two suggestions for your -glm- fitting. Plot the data for the model which didn't converge and see whether the model makes sense. If it does, you may need to tweak the maximize_options. I have had similar difficulties some of the time and found that -technique()- can be crucial. The details are on another computer but my hazy recollection is that -technique(bhhh)- worked better. However, for consistency you should refit all your models the same way. You should not worry about the note you see, but it is a reasonable message given your use of -family(binomial)-. In general, models that do not converge are, in my view, not publishable in any sense, however good the partial results look. I'd say, at a minimum, that it is unethical to quote them without flagging explicitly that they did not converge. -outreg- is a user-written program from SSC, as you are asked to explain. Nick n.j.cox@durham.ac.uk Roger Cremades Rodeja 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? 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? 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. 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. Please somebody knows if this analysis can be carried on using another sofware? I need these results.. * * 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: 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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