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


From   "Martin Weiss" <[email protected]>
To   <[email protected]>
Subject   st: RE: what does it mean the default for -mfx- is discrete when it is evaluated at the mean?
Date   Tue, 1 Jun 2010 23:27:18 +0200

<>

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: [email protected]
[mailto:[email protected]] On Behalf Of Nirina F
Sent: Dienstag, 1. Juni 2010 16:09
To: [email protected]
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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