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st: margins for 1 standard deviation change


From   David Souther <davidsoutheremail@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   st: margins for 1 standard deviation change
Date   Wed, 12 Jan 2011 09:53:23 -0600

I need to get the discrete (1 standard deviation, not 0->1) change for
binary variables in my logit equation, just like:

clear
webuse auto
recode rep78(0/3 = 1) (3/99 = 0)
logit for price mpg head rep78
mfx, at(mean)

logit for price mpg head i.rep78
margins, dydx(*) atmeans

but this shows only 0->1 discrete change for my new 'rep78' variable.
 How can I output 1 stddev change(or 1/2 std dev change) in margins??
(or mfx, though I prefer to use margins since it understands factor
variables)
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