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Re: st: Heckman Selection Model.


From   Maarten Buis <[email protected]>
To   [email protected]
Subject   Re: st: Heckman Selection Model.
Date   Mon, 17 Oct 2011 20:07:08 +0200

The best way is not to do this manually, but correct your call to
-heckman-, see -help heckman- on how to specify a correct -heckman-
model.

Hope this helps,
Maarten

On Mon, Oct 17, 2011 at 7:43 PM, natasha agarwal
<[email protected]> wrote:
> Dear All,
>
> I want to estimate a heckman selection model, but I get an error
> saying 'Dependent variable never censored because of selection: model
> would simplify to OLS regression'.
>
> So I try to do the heckman manually. First I estimate, a probit model
> and then calculate the inverse mills ratio. However, when I include
> the inverse mills ratio in the second stage which is the OLS, I need
> to adjust the standard errors. However, I don't know how to manually
> adjust the standard errors for the same. Any help will be highly
> appreciated.
>
> Thanks
> Natasha
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-- 
--------------------------
Maarten L. Buis
Institut fuer Soziologie
Universitaet Tuebingen
Wilhelmstrasse 36
72074 Tuebingen
Germany


http://www.maartenbuis.nl
--------------------------

*
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