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From |
Arne Risa Hole <arnehole@gmail.com> |

To |
statalist@hsphsun2.harvard.edu |

Subject |
Re: st: MIXLPRED: marginal effects after-MIXLOGIT- |

Date |
Wed, 29 Feb 2012 11:01:57 +0000 |

Dear Kayo, It's difficult to help without knowing more about your application. Most importantly: what is the unit of measurement of the income variable? If income is measured in dollars or euros (or yen), for example, you would expect the marginal effect of a one unit increase in income to be small. See Richard Williams' reply to my earlier post on calculating marginal effects after -mixlogit-. Arne 2012/2/29 nagi kayo <kayonagi@hotmail.co.jp>: > Dear Professor Arne Risa Hole and all > > > > I read the thread Professor Hole kindly wrote on "Mon, 6 Feb. 2012 13:18:34" about calculating marginal effects after -mixlogit- and tried to calculate marginal effects using the following commands. in my estimation model, the number of alternatives is four, and "inc" is a demographic variable, and "price" is an alternative specific variable. > > > > mixlogit d d1inc d2inc d3inc, group(id) rand(price) > mixlpred pred_base > > replace d1inc=d1inc+1 > replace d2inc=d2inc+1 > replace d3inc=d3inc+1 > replace d4inc=d4inc+1 > mixlpred pred_inc > > > however, unexpectedly, "pred_inc" is quite similar to "pred_base," and thus the difference between the two is almost zero, which means that the marginal effect of income is almost zero. > > although i also tried the other explanatory variables, the results are not changed (in all cases, marginal effects are almost zero). > > is my calculation of predicted probabilities wrong? > > > > i greatly appreciate it if you would give me your advice. > > > > with best wishes, > > Kayo > > > * > * 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/

**References**:**st: MIXLPRED: marginal effects after-MIXLOGIT-***From:*nagi kayo <kayonagi@hotmail.co.jp>

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