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st: Margins after xtreg, fe
From
natasha agarwal <[email protected]>
To
[email protected]
Subject
st: Margins after xtreg, fe
Date
Tue, 23 Aug 2011 17:33:35 +0100
Dear All,
I am estimating the following model
xtreg lnrval lnk lnw lnvfdi efd fdi*efd y14-y18, fe vce(robust)
(efd drops out of the estimation as it is time-invariant)
And then I want to estimate the elasticity at the median of efd. So I estimate
margins, eyex(lnvfdi) at((median) efd)
I get the following result
Average marginal effects Number of obs = 38573
Model VCE : Robust
Expression : Linear prediction, predict()
ey/ex w.r.t. : lnvfdi
at : efd = .2371 (median)
------------------------------------------------------------------------------
| Delta-method
| ey/ex Std. Err. z P>|z| [95% Conf. Interval]
-------------+----------------------------------------------------------------
lnvfdi | (not estimable)
------------------------------------------------------------------------------
Can someone please explain me why do I get such an output?
Many thanks
Natasha
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