st: No-linear combinations of two estimators from two models

["gong shizhuo" <west_garden@hotmail.com>]

Dear Stata Users:

Does anyone know how to make the no-linear combinations of two estimators 
from two models? Also, how to make second no-linear combinations based on 
the first no-linear combiantions results of two estimators from the same 
model? It seems delta method would work here. Just wonder anyone of you have 
done such a programing.

Thanks.

SIncerely.
Carl
Johns Hopkins University

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