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Re: st: "mfx, predict at(...)" evaluated at CONDITIONAL means?

From   Eva Poen <>
Subject   Re: st: "mfx, predict at(...)" evaluated at CONDITIONAL means?
Date   Sun, 15 Mar 2009 16:09:46 +0000


I haven't had a closer look, but I think there is a very simple
solution for your problem: you can simply use an if condition with
-mfx-. Here is an example using the auto data:

sysuse auto
probit foreign mpg rep78 weight

* marginal effects at conditional means of mpg and weight if rep78==3:
mfx compute if rep78==3

* check if the last column really contains conditional means:
sum mpg weight if e(sample) & rep78==3

I quickly checked Martin's solution, and it comes to the same results.

Hope this helps,

2009/3/15 Christoph Carl Basten <>:
> 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 else at
> the conditional means?
> Thanks for your consideration and best regards,
> Christoph

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