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Re: st: Error message when using SSM (ordered probit with sample selection)

From   Alfonso Miranda <>
To   "" <>
Subject   Re: st: Error message when using SSM (ordered probit with sample selection)
Date   Tue, 5 Jul 2011 07:58:25 +0100

Dear Pamela,

Will you send example so that I can reproduce the error?



On 5 Jul 2011, at 07:52, "Katic, Pamela (IWMI-Ghana)" <> wrote:

> I'm trying to estimate an ordered probit model with sample selection.
> I've only found one command in STATA that's able to do this: ssm. I
> tried using it but I keep getting the error message r(2000), that is, no
> observations on which to run the model. I checked the response variable
> and the selection variable as well, but cannot find any mistakes. I ran
> the ordered probit with no sample selection and it works fine, and so
> does the probit selection model separately. Any guidance on this matter
> will be greatly appreciated. Many thanks.
> Cheers,
> Dr. Pamela G Katic
> International Water Management Institute Accra Office - GHANA
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