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st: NLLS problem


From   btallaire@mail.utexas.edu
To   statalist@hsphsun2.harvard.edu
Subject   st: NLLS problem
Date   Sat, 24 Sep 2005 10:09:33 -0500

Stata users -
Hello, I am try to estimate a wage model by non-linear least squares.

wage =
exp({educ}*educ+{exper}*exper+{espersq}*espersq+{smsa}*smsa+{south}*south)+
{delta}*(exp({educ2}*educ+{exper2}*exper+{espersq2}*espersq+{smsa2}*smsa+{south2}*south)^2))

Every time I attempt to estimate it, stata gives me "
* Parameter south2 taken as constant term in model & ANOVA table"

Why is this?  What am I doing incorrect?  I've tried different starting values
for south2 and it doesn't seem to work.

Any help would be most appreciated!
Thanks!!!
Ben

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