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Re: st: Double selectivity model


From   nigussie Tefera <nitefera@yahoo.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: Double selectivity model
Date   Mon, 9 Mar 2009 23:28:38 -0700 (PDT)

Hello Justin
 
Many thanks! Yes, I have sequential binary outcomes. I want to examine determinants of maize production (yield), which would be affected by fertilizer and improved seed adoption.  We believe that households adopt fertilizer depending on the benefit gained against traditional farming system (without fertilizer adoption). Again households are adopting improved seed provided that they already adopt fertilizer. So in the first stage, I want to run biprobit model that allow me to capture fertilizer and improved seed adoption simultaneously. In the second stage I want to use these coefficients (in two stage least square) to analyze determinates of production (yield). I would very happy if you share me the do-file you already built.
 
Cheers
Nigussise




----- Original Message ----
From: Justin Falk <justfalk@yahoo.com>
To: statalist@hsphsun2.harvard.edu
Sent: Friday, March 6, 2009 11:19:29 PM
Subject: Re: st: Double selectivity model

If you have sequential binary outcomes you can use heckprob. If you have an outcome that is only observed if two other sequential binary conditions are met (so you have three equations in all, like a "double heckit") you can write a two step program pretty easily. I had to do that recently, and I'm willing to share the do-file.

Justin

--- On Fri, 3/6/09, nigussie Tefera <nitefera@yahoo.com> wrote:

> From: nigussie Tefera <nitefera@yahoo.com>
> Subject: st: Double selectivity model
> To: statalist@hsphsun2.harvard.edu
> Date: Friday, March 6, 2009, 9:20 AM
> Dear statalist members
> 
> Is there a program for estimating Double selectivity model
> for STATA? I appericiate any help
> 
> Cheers
> 
> Nigussie
> 
> 
>      
> 
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