At 08:11 PM 8/9/2009, Nicolas Herault wrote:
I do have the same version as you.
One of the reasons I am using margeff rather than mfx is that I want
average marginal effects rather than marginal effects at the mean.
Below is a simple model, where jlpyrs is the number of years in a
jobless household (ranging from 0 to 7).
You will see that the marginal effects obtained with margeff (for
gender) are much smaller than the ones computed 'manually'
(variables t0 to 7 below).
I did the same experiment with mlogit, probit and xtprobit and I did
get for these models the same values for both marginal effects.
That's why I am wondering whether there is a bug in margeff after oprobit.
Isn't the new -margins- command in Stata 11 supposed to be able to do
the same things as margeff? I'm having trouble figuring out the
exact syntax though -- does anybody know how to do it? I'm thinking
it would be something like
oprobit y i.x
margins, dydx(*) predict(outcome(1))
margins, dydx(*) predict(outcome(2))
margins, dydx(*) predict(outcome(3))
But, no matter what command I use (ologit, mlogit, oprobit) I can't
reproduce margeff's results, so I think I must be doing something wrong.
-------------------------------------------
Richard Williams, Notre Dame Dept of Sociology
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