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st: margins on continuous interactions.

From   Natasha Agarwal <>
Subject   st: margins on continuous interactions.
Date   Thu, 5 Dec 2013 11:57:36 +0530

Dear all,

I estimate a fixed effect model xtreg y x1 x2 x3*x4 year dummies, fe

where y, x1, x2, are firm level variables. x3 changes over
industry-region-year. while x4 changes only over industry. After this, I
estimate margins, dydx(x3) at(x4 = 0.15). I get a not estimable error. I
then try to use the noestimcheck option, and state margins, dydx(x3)
at(x=0.15) noestimcheck. and I get an output. However I am not sure whether
it is correct to use the noestimcheck option here.

Any insight would be appreciated.

Natasha Agarwal
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