st: RE: what does it mean the default for -mfx- is discrete when it is evaluated at the mean?

["Martin Weiss" <martin.weiss1@gmx.de>]

<>

The point of evaluation does not seem to matter at all in this code, though:


***********
sysuse auto, clear
reg price weight length foreign
mfx compute, dydx at(mean foreign=0)
mfx compute, dydx at(mean foreign=1)
mfx compute, dydx at(mean foreign=.2)
mfx compute, dydx at(mean foreign=.5)
mfx compute, dydx at(mean foreign=.8)
***********


HTH
Martin


-----Original Message-----
From: owner-statalist@hsphsun2.harvard.edu
[mailto:owner-statalist@hsphsun2.harvard.edu] On Behalf Of Nirina F
Sent: Dienstag, 1. Juni 2010 16:09
To: statalist@hsphsun2.harvard.edu
Subject: st: what does it mean the default for -mfx- is discrete when it is
evaluated at the mean?

Hello,
I have a dummy for dependent and main independent variable. I am using
ivprobit.
When I try to get the marginal effects, mfx  shows you that the
default setting is 'discrete', that is, evaluate the marginal effect
of a dummy going from 0->1. But it is evaluated at the mean (and under
x it shows 0.37 for the independent variable) so I am a little bit
confused about the interpretation of the marginal effect.
Thank you for your help.
Nirina
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