----- Original Message -----
From: "Dimitriy V. Masterov" <[email protected]>
Date: Wednesday, July 26, 2006 2:33 pm
Subject: Re: st: margeff and svy: probit
To: [email protected]
> On 7/26/06, Richard Williams <[email protected]> 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.
>
margeff, at(mean) model(svy: probit)
appears to be using the -eform- option. Note, any two (space
separated) terms will yield the same results:
. margeff, at(mean) model(garbage garbage)
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
-----------------------------------------------------------------------
-------
.
At first glance, it looks like line 54 should be changed from
SetSMacros `model' `eform'
to
SetSMacros "`model'" "`eform'"
This will result in:
. margeff, at(mean) model(garbage garbage)
-margeff- does not work with garbage garbage; use -mfx- instead
Scott
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