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Re: st: problem running mfx after glm
From
Richard Williams <[email protected]>
To
[email protected], "'[email protected]'" <[email protected]>
Subject
Re: st: problem running mfx after glm
Date
Mon, 15 Aug 2011 19:19:33 -0500
At 05:27 PM 8/15/2011, Marlis Gonzalez Fernandez wrote:
Hello-
Did the following analysis last fall:
glm ReadingCompCombdiv100 education, family(binomial) link(logit) robust
followed by:
mfx, at(mean)
This provided me with the marginal effects after glm (variable of
interest is a proportion).
Any idea why this is giving me a problem.having trouble figuring out
how to do this using margins instead of mfx.
Here is a simple example, that should work in Stata 11 or later:
use "http://www.indiana.edu/~jslsoc/stata/spex_data/ordwarm2.dta";, clear
glm warmlt3 yr89 male white age ed prst, link(logit) family(binomial) robust
mfx, at(mean)
glm warmlt3 i.yr89 i.male i.white age ed prst, link(logit)
family(binomial) robust
margins, dydx(*) atmeans
Note how, the 2nd time around, I added the i. before the names of the
categorical independent variables. This is necessary so that margins
will know they are categorical; otherwise it would treat them as
continuous when computing the marginal effects.
-------------------------------------------
Richard Williams, Notre Dame Dept of Sociology
OFFICE: (574)631-6668, (574)631-6463
HOME: (574)289-5227
EMAIL: [email protected]
WWW: http://www.nd.edu/~rwilliam
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