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st: Nonlinear regression syntax

From   David Ashcraft <>
To   "" <>
Subject   st: Nonlinear regression syntax
Date   Sat, 19 Jan 2013 03:12:01 -0800 (PST)

I want to run the following model as a non-linear regression:

nl (rx={rg}+{rg*(1+exp(-gamma*(moveave-ci)))^-1}+{gfc})

where rx is dependent variable. when I run this model Stata gives the  error code: r(480); starting values invalid or some RHS variables have missing values

As a second option, I solved the non-linear function outside the equation by having a new variable fm={rg*(1+exp(-gamma*(moveave-ci)))^-1} and run again:

nl (rx={rg}+{fm}+{gfc})

Now I get the results with omitted values for fm.

I don't know where is my mistake. Any help will be greatly appreciated.

Best Regards

David Ashcraft
Bangor University
Bangor Gwyned LL57 2DG

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