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Re: st: Inequality restrictions in ml


From   Maarten buis <maartenbuis@yahoo.co.uk>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: Inequality restrictions in ml
Date   Sat, 6 Oct 2007 13:17:19 +0100 (BST)

--- Wafa Hakim Orman <wafa1024@gmail.com> wrote:
> in which a procedure to restrict one parameter as positive is
> described, but all they appear to be doing is using exp(b) when they
> want to restrict b > 0. Seems to me like that's just a non-linear
> model rather than restricting the parameter. Or am I missing
> something? 

If you maximize exp(b), than b=ln(exp(b)) can only have possitive
values, ergo b is restricted to be positive.

> Is there a better way to do this?

Not in Stata

Hope this helps, 
Maarten


-----------------------------------------
Maarten L. Buis
Department of Social Research Methodology
Vrije Universiteit Amsterdam
Boelelaan 1081
1081 HV Amsterdam
The Netherlands

visiting address:
Buitenveldertselaan 3 (Metropolitan), room Z434

+31 20 5986715

http://home.fsw.vu.nl/m.buis/
-----------------------------------------


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