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From |
"Verkuilen, Jay" <JVerkuilen@gc.cuny.edu> |

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

Subject |
st: RE: Missing standard errors in multinomial logit |

Date |
Sat, 9 May 2009 18:29:39 -0400 |

serena.trucchi@unito.it wrote: >>I am trying to estimate choices about living arrangements by a multinomial logit (mlogit). If I use more than one dummy variable (ex regional dummies, or sex and a dummy for employee) stata fails to compute standard errors of the coefficient of the constant term (they are missing in the output table and zero in the variance/covariance matrix). How can I solve my problem?<< When Stata fails to compute standard errors this is usually a sign of a larger problem with your model. I'd guess that you have near perfect prediction---common when you enter dummies into a multinomial logit---so Stata is able to generate an estimate but it's a nearly useless one. But it could be some other serious misspecification. Perhaps you could post your syntax and the exact output that Stata gave, especially any warnings it threw, because as of now there's very little anyone can tell you for sure.... JV * * 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: Missing standard errors in multinomial logit***From:*serena.trucchi@unito.it

**References**:**st: Missing standard errors in multinomial logit***From:*serena.trucchi@unito.it

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