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From |
"Vitorino, Maria Ana" <vitorino@wharton.upenn.edu> |

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

Subject |
Re: st: Calculating predicted probabilities at a given value of one of the independent variables |

Date |
Thu, 27 Oct 2011 03:05:52 +0000 |

Thanks!! But the results should be the same as in your previous suggestion, right? Or am I missing something? Ana On Oct 26, 2011, at 10:53 PM, "Richard Williams" <richardwilliams.ndu@gmail.com> wrote: > At 06:06 PM 10/26/2011, Maria Ana Vitorino wrote: >> Dear Statalist users, >> >> I would like to calculate some predicted probabilities after fitting a >> multinomial logit model (asclogit). But, the twist is that I would >> like to calculate these fitted values for a given level of one of the >> independent variables. Namely, I would like to set one of the Xs to >> zero when computing the predicted probability (but not in the >> estimation). >> What would be the best way of going about this? Would it make sense to >> do it in 2 steps? In the first step use "predict xb" and in the >> second step remove the component of xb that I'm not interested and >> calculate the probability using "gen" and the logit formula? >> Or is there a better way? > > I am going to slightly tweak my earlier advice. Assuming you only want in-sample predictions, > > webuse sysdsn1, clear > clonevar xmale = male > mlogit insure age i.xmale nonwhite i.site > predict p1 p2 p3 if e(sample) > replace xmale = 0 if !missing(xmale) > predict pp1 pp2 pp3 if e(sample) > > > ------------------------------------------- > Richard Williams, Notre Dame Dept of Sociology > OFFICE: (574)631-6668, (574)631-6463 > HOME: (574)289-5227 > EMAIL: Richard.A.Williams.5@ND.Edu > WWW: http://www.nd.edu/~rwilliam > > * > * 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: Calculating predicted probabilities at a given value of one of the independent variables***From:*Richard Williams <richardwilliams.ndu@gmail.com>

**Re: st: Calculating predicted probabilities at a given value of one of the independent variables***From:*Richard Williams <richardwilliams.ndu@gmail.com>

**References**:**st: Calculating predicted probabilities at a given value of one of the independent variables***From:*Maria Ana Vitorino <vitorino@wharton.upenn.edu>

**Re: st: Calculating predicted probabilities at a given value of one of the independent variables***From:*Richard Williams <richardwilliams.ndu@gmail.com>

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