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 <[email protected]> wrote:
> From: nigussie Tefera <[email protected]>
> Subject: st: Double selectivity model
> To: [email protected]
> 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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*
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