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st: lincom after nlsur


From   Carl Nelson <chnelson@illinois.edu>
To   statalist@hsphsun2.harvard.edu
Subject   st: lincom after nlsur
Date   Thu, 27 Nov 2008 10:34:01 -0600 (CST)

When I estimate a nonlinear equation system with a function evaluation program using the syntax

nlsur aids5 @ w1 w2 w3 w4 np1 np2 np3 np4 np5 nw, /*
*/ parameters(a1 a2 a3 a4 b1 b2 b3 b4 g11 g12 g13 g14 /*
*/ g22 g23 g24 g33 g34 g44) nequations(4) 

The estimates report gives me parameters a1 - g44.
But when I try to construct linear combinations of parameters with 

lincom 1 - a1 - a2 - a3 - a4

,for example, a1 can not be found. In the online documentation I can not find reference to how to retrieve nonlinear parameters for expressions in lincom after nonlinear estimation.

Can someone tell me the correct syntax for lincom after nonlinear estimation? Thanks.

Carl Nelson
University of Illinois - Urbana Champaign

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