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RE: st: RE: Positivity


From   "Rodrigo Alfaro A." <ralfaro@bcentral.cl>
To   <statalist@hsphsun2.harvard.edu>
Subject   RE: st: RE: Positivity
Date   Tue, 29 Jul 2008 16:57:47 -0400

///

Still, unclear... are you doing regressions? If ML seems complicated you
could try -nl-, but it requires some programming, I would not say
complicated. 

 

-----Mensaje original-----
De: owner-statalist@hsphsun2.harvard.edu
[mailto:owner-statalist@hsphsun2.harvard.edu] En nombre de Teresa Linz
Enviado el: Martes, 29 de Julio de 2008 02:45 p.m.
Para: statalist@hsphsun2.harvard.edu
Asunto: Re: st: RE: Positivity

Yes that is exactly what I mean. I have heard that this reparamrisation
is quite complicated in Stata, is that right? How can I do it in detail?
Thank you for your answer so far

Teresa



On Tue, 29 Jul 2008 18:49:32 +0100
  "Nick Cox" <n.j.cox@durham.ac.uk> wrote:
> If you mean: How can I ensure that I get positive estimates for  
>coefficients I expect to be positive, the answer is to reparametrise in

>terms of logarithms.
> 
> Otherwise, please expand on this question.
> 
> Nick
> n.j.cox@durham.ac.uk
> 
> Teresa Linz
> 
> And I have another question; does anybody know how I could  programme 
>positivity for some coefficients in Stata?
> 
> *
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_______________________________

Teresa Linz, M.Sc.

Junior Researcher

Center for Development Research

Walter-Flex-Str. 3

53113 Bonn

Germany

Tel.: +49 228/73 4962
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