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It is an interesting prob, and I cannot think of a built-in solution of the top of my head. If I wanted to conduct the whole thing manually, would I do like this?
********
sysuse auto, clear
probit foreign mpg weight price
mfx, at(mpg=30)
*auxiliary regressions
reg price mp
loc adjustedprice = _b[_cons]+_b[mpg]*30
reg weight mp
loc adjustedweight = _b[_cons]+_b[mpg]*30
*insert locals into -mfx- calculations
qui probit foreign mpg weight price
mfx, at(mpg=30 price=`adjustedprice' weight=`adjustedweight')
*********
I can see how one would turn this into a -program-, where you pass a separate -varlist- to Stata for the variables that should be set to their conditional mean...
HTH
Martin
-------- Original-Nachricht --------
> Datum: Sun, 15 Mar 2009 13:40:32 +0100
> Von: Christoph Carl Basten <[email protected]>
> An: [email protected]
> Betreff: st: "mfx, predict at(...)" evaluated at CONDITIONAL means?
> Hi,
>
> when estimating the marginal effects (using e.g. "mfx") after a Probit
> regression, I'd like to set one value (age) to a representative value,
> say 50 years, and have all other variables at the /conditional/ mean for
> those aged 50.
>
> >From what I understand, if I specify only "mfx, predict at(age=50),
> Stata will set all other variables to the /population/ means, so the only
> way to have them set at the means conditional on age=50 would be to
> compute all these conditional means by hand and then specifying them
> manually in the atlist.
>
> But is there any option to tell Stata that I want age=50 and e.th. else
> at the conditional means?
>
> Thanks for your consideration and best regards,
> Christoph
>
>
> *
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> * http://www.stata.com/support/statalist/faq
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--
Martin Weiss
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*
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