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st: boundary constraints within nl

From   Marc Keuschnigg <>
Subject   st: boundary constraints within nl
Date   Fri, 06 Jun 2008 19:22:53 +0200


I am estimating non linear least squares models (nl) using equations like: nl (y = ({a}+{b}* x) * (1-x)).
My question is, how do I impose parameter restrictions like a >=0 and b >=0?
I could log-transform the parameters, but I don't know how to do it technically within the nl command.

Thanks for helping,

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