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st: Model specification problem for the Heckman twostep model
I'm required to check and the model specifications for my Heckman model
with the twostep option, such as heteroscedasticity, normality of residual,
non-linearity and so on. However, the current commands e.g. hettest,
whitetst, predict (residual), rvfplot, etc. can not be applied right after
the heckman estimation.
Would you pls provide any commands can help to test, or are there any ad
hoc commands can check the robustness of the heckman estimation?
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University of Technology, Sydney
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