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From |
John Francis <francisj71@googlemail.com> |

To |
statalist@hsphsun2.harvard.edu |

Subject |
Re: st: Obtaining rrr's of margins after mlogit |

Date |
Thu, 22 Mar 2012 11:31:02 +0100 |

Thank you Maarten, That part I had figured out already. Please let me respecify: what I want is to first run -mlogit-, say .mlogit depvar i.edu##i.coh i.sex##i.coh, b(2) nolog Then, I would first like to get the marginal effects for each outcome in order to get RRRs of the interaction terms, with each of the four categories in relation to category 2. The reason I want to do this is so that I can use the method described in your Stata-Tip regarding the interpretation of interaction effects in nonlinear models. This means that I would run .forval i = 1/4 { .margins, over(i.edu i.coh) expr(exp(xb(#`i'))) post .est sto m`i' .} so that afterwards, I could use -lincom- in order to interpret the interaction effects as RRRs. Same goes for the interaction of sex and coh. This is how far I got so far. Now of course, Stata tells me "Warning: prediction constant over observations." I take that to mean that the specification of xb() is wrong, yet I don't know how I should change it. Besides, is this the correct way to apply the procedure described by you to a multinomial logit model? Regards, John On Thu, Mar 22, 2012 at 9:14 AM, Maarten Buis <maartenlbuis@gmail.com> wrote: > On Wed, Mar 21, 2012 at 5:37 PM, John Francis wrote: >> I have a question on obtaining margins as relative risk ratios instead >> of probabilities after I run the mlogit command. > > You can specify the -rrr- option in -mlogit-. > > 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/ * * 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: Obtaining rrr's of margins after mlogit***From:*Maarten Buis <maartenlbuis@gmail.com>

**References**:**st: Obtaining rrr's of margins after mlogit***From:*John Francis <francisj71@googlemail.com>

**Re: st: Obtaining rrr's of margins after mlogit***From:*Maarten Buis <maartenlbuis@gmail.com>

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