> I have used the heckit function in micEcon.
> ...
> How can I then get the AIC for this model?

It appears that the heckit $probit object is of class 'glm' and so, for
example:

main.result <- heckit(whateveryouaredoing)        # Do your heckit()...
probit.result <- main.result$probit         # The glm object produced by
heckit()
probit.aic <- probit.result$aic                 # The AIC, see ?glm

should have what you need, ready to go.  I used these tedious names and
three lines of code just to be clear about what is what (I wouldn't really
do it this way).  !)

Jay

-- 
John W. Emerson (Jay)
Assistant Professor of Statistics
Director of Graduate Studies
Department of Statistics
Yale University
http://www.stat.yale.edu/~jay

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