--- Carlos Gamero <[email protected]> wrote:
> In your previous messages you advice me to use heckprob command in
> order to manage the situation I describe. However, heckprob command
> is designed to correct sample selection bias when both, main
> regression (job satisfaction) and selection equation, are probit
> regressions. But, what happens when you do not have a probit as
> selection equation but a bivariate probit as it is in my case?
I read your problem as follows: You are substantively interested in
work satisfaction (satisfied/not satisfied) and you think you have two
selection equations: 1) do you work or not, and 2) are you in education
or not.
If that is the case, than you have just one selection equation: The
selection is that you cannot be satisfied of dissatisfied with your job
if you don't have a job. In education or out of education is not a
selection equation because you can still be satisfied with a job if you
are in education as long as you also have a job. You are less likely to
have a job when you are in education, but that just means that being in
education should be an explanatory variable in your selection equation.
Hope this helps,
Maarten
-----------------------------------------
Maarten L. Buis
Department of Social Research Methodology
Vrije Universiteit Amsterdam
Boelelaan 1081
1081 HV Amsterdam
The Netherlands
visiting address:
Buitenveldertselaan 3 (Metropolitan), room Z434
+31 20 5986715
http://home.fsw.vu.nl/m.buis/
-----------------------------------------
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