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From |
Austin Nichols <austinnichols@gmail.com> |

To |
statalist@hsphsun2.harvard.edu |

Subject |
Re: st: Query about finding predicted change in probability after logit for changing two variables |

Date |
Thu, 9 Jun 2011 15:20:19 -0400 |

Urmi Bhattacharya <ub3@indiana.edu> wrote: "now i want to find what is the predicted change in the probability of foreign for those cars with cqual_high=1 with turn_high=1 from those with cqual_medium=1 and turn_low=1" The meaning of the above is totally unclear to me, and I cannot understand you cqual_ coding is supposed to be, but perhaps you mean to: compare (1) medium==1 and turnhi==0 to (2) high==1 and turnhi==1 like so: clear all u if rep78<. using `c(sysdir_base)'a/auto g byte medium=inlist(rep78,3,4) g byte high=inlist(rep78,5) g byte turnhi=(turn>35) logit foreign high medium turnhi headroom mpg trunk replace medium=1 replace high=0 replace turnhi=0 predict p1 replace medium=0 replace high=1 replace turnhi=1 predict p2 g dp=p2-p1 if e(sample) su dp, mean mat dp=r(mean) loc n=r(N) prog drop _all prog mymarg, rclass u if rep78<. using `c(sysdir_base)'a/auto, clear bsample g byte medium=inlist(rep78,3) g byte high=inlist(rep78,45) g byte turnhi=(turn>35) logit foreign high medium turnhi headroom mpg trunk replace medium=1 replace high=0 replace turnhi=0 predict p1 replace medium=0 replace high=1 replace turnhi=1 predict p2 g dp=p2-p1 if e(sample) su dp, mean ret scalar dp=r(mean) eret clear end simulate, reps(141) seed(123): mymarg bstat, stat(dp) n(`n') *But I want to reiterate that you should look at each duration's risk set separately: http://www.stata.com/statalist/archive/2011-06/msg00465.html * * 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: Query about finding predicted change in probability after logit for changing two variables***From:*Urmi Bhattacharya <ub3@indiana.edu>

**References**:**st: Query about finding predicted change in probability after logit for changing two variables***From:*Urmi Bhattacharya <ub3@indiana.edu>

**Re: st: Query about finding predicted change in probability after logit for changing two variables***From:*Austin Nichols <austinnichols@gmail.com>

**Re: st: Query about finding predicted change in probability after logit for changing two variables***From:*Urmi Bhattacharya <ub3@indiana.edu>

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