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Re: st: computing correct marginal effect in xtlogit model


From   Richard Williams <richardwilliams.ndu@gmail.com>
To   statalist@hsphsun2.harvard.edu, statalist@hsphsun2.harvard.edu
Subject   Re: st: computing correct marginal effect in xtlogit model
Date   Tue, 25 Oct 2011 17:19:02 -0500

At 04:03 PM 10/25/2011, ramesh wrote:
Hello,
I am using xtlogit model with an interaction term (e.g., y=
b0+b1.x1+b2.x1*x1+b3.x3). I want to compute the marginal effect of 'x1'.
However stata 'mfx compute, predict(pu0)' code treated 'x1' and 'x1*x1' as
two separate variables (in fact they are not) and gives two marginal effect
(marginal effect of 'x1', 'x1*x1'). I want to find the correct marginal
effect of variable 'x1'. Is there any way to to do this in stata?

Thanking in advance for your kind response!
Ramesh

If you have Stata 11 or higher, use the -margins- command. Assuming x1 is continuous, The command will be something like

xtlogit y x1 c.x1#c.x1

followed by the margins command. If you aren't familiar with margins, my notes on this are at http://www.nd.edu/~rwilliam/xsoc73994/Margins01.pdf .


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