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Re: st: Inequality restrictions in ml

From   Maarten buis <>
Subject   Re: st: Inequality restrictions in ml
Date   Sat, 6 Oct 2007 13:17:19 +0100 (BST)

--- Wafa Hakim Orman <> 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 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

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