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st: nl with constrains


From   "Olga Lyashevska" <olga.stata@herenstraat.nl>
To   statalist@hsphsun2.harvard.edu
Subject   st: nl with constrains
Date   Fri, 9 May 2008 10:20:06 +0200 (CEST)

Dear all,

We have a negative exponential growth model.
y=a exp(-kx)+b
Is there is a way to impose constrains on model parameters such as b>0 and
k1<k<k2?


Thank you in advance,
Olga

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