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st: RE: RE: parameter restrictions


From   "Nick Cox" <n.j.cox@durham.ac.uk>
To   <statalist@hsphsun2.harvard.edu>
Subject   st: RE: RE: parameter restrictions
Date   Tue, 16 Jul 2002 22:52:00 +0100

Henrik Andersson [mailto:henrik.andersson@tft.lth.se]
> 
> are there any possibilities to put restrictions on parameters in 
> regressions (in my case nonlinear), for example >0 and 
> <0.5? (I cannot find 
> anything on the subject in the "manuals".)

In the first case, say a > 0, sometimes it makes sense 
to reparameterise the problem as fitting in log a
and then exponentiate the fitted value. 

Nick 
n.j.cox@durham.ac.uk 
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