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Re: st: margeff and svy: probit


From   Richard Williams <Richard.A.Williams.5@ND.edu>
To   statalist@hsphsun2.harvard.edu, statalist@hsphsun2.harvard.edu
Subject   Re: st: margeff and svy: probit
Date   Wed, 26 Jul 2006 16:40:21 -0500

At 02:32 PM 7/26/2006, Dimitriy V. Masterov wrote:
On 7/26/06, Richard Williams <Richard.A.Williams.5@nd.edu> wrote:
I just tried the following - given that margeff and mfx produce the
same results, I am guessing you are ok (but I can't guarantee it).

use "http://www.stata-press.com/data/r9/nhanes2f.dta";
svy: probit  heartatk height weight female black
margeff, at(mean)
mfx
margeff, at(mean) model(probit)
I agree about the simple probit option. However,

margeff, at(mean) model(svy: probit)

yields a fairly different result.
Look at how the output is labeled though. It should probably return an error when you do that, but instead it apparently thinks you specified the -eform- option.

. margeff, at(mean) model(svy: probit)

Marginal effects at means on E(exp[xb]) after probit

------------------------------------------------------------------------------
heartatk | Coef. Std. Err. z P>|z| [95% Conf. Interval]
-------------+----------------------------------------------------------------
height | -.0041219 .0006151 -6.70 0.000 -.0053275 -.0029164
weight | .0011411 .0002983 3.82 0.000 .0005563 .0017258
female | -.0920927 .0127091 -7.25 0.000 -.117002 -.0671833
black | -.0132351 .0101956 -1.30 0.194 -.0332181 .0067479
------------------------------------------------------------------------------

. margeff, at(mean) model(probit) eform

Marginal effects at means on E(exp[xb]) after probit

------------------------------------------------------------------------------
heartatk | Coef. Std. Err. z P>|z| [95% Conf. Interval]
-------------+----------------------------------------------------------------
height | -.0041219 .0006151 -6.70 0.000 -.0053275 -.0029164
weight | .0011411 .0002983 3.82 0.000 .0005563 .0017258
female | -.0920927 .0127091 -7.25 0.000 -.117002 -.0671833
black | -.0132351 .0101956 -1.30 0.194 -.0332181 .0067479
------------------------------------------------------------------------------




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Richard Williams, Notre Dame Dept of Sociology
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