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Re: st: mfx


From   "Arne Risa Hole" <arnehole@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: mfx
Date   Fri, 18 Jul 2008 15:22:09 +0100

Hi Chiara,

How about this?

sysuse auto
probit foreign price mpg
mfx
sum price
local mean_price = r(mean)
#delimit ;
twoway (function y = _b[mpg]*normden(_b[price]*`mean_price'+
_b[mpg]*x+_b[_cons]), range(mpg)) ;
#delimit cr

This plots the marginal effect of the mpg variable over its range
following a probit regression. The logic is the same with -biprobit-
but the formula for the marginal effect will of course be a little
more intricate in that case.

Arne

2008/7/18 Chiara Mussida <cmussida@gmail.com>:
> Dear All,nuous variab
> is there a way to "plot" the mfx of a continuous variable (after a
> biprobit) to infer its behaviour over the complete range of values and
> not only for the mean of the independent variables (which is the
> default)?
>
> Thanks
>
> --
> Chiara Mussida
> PhD candidate
> Doctoral school of Economic Policy
> Catholic University, piacenza (Italy)
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