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st: Moderator of knot location in hockey stick regression


From   Jordan Silberman <silberman.stata@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   st: Moderator of knot location in hockey stick regression
Date   Tue, 12 Mar 2013 16:16:00 -0400

Hi Statalist,

We used a hockey stick regression model to identify the optimal knot
location for a piecewise regression of healthcare costs on age. Now we
want to ask the question: is the knot location observed for males
different from that of females? Does anyone know of a way to test this
hypothesis in Stata? What we basically want to do is test the null
hypothesis that the optimal knot location observed for group 1 is the
same as that of group 2.

Thanks,
Jordan
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