Hello every one
first: i know two ways to use Heckman test, (1) by generate dummy variable as follows:
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generate dy = dependent_var > 0
then run Heckman command
but in case the dependent variable is dummy we got this message (dependent variable collinear with _cons)
my question is
can we use heckman model with dummy dependent variable?


(2) in case i want to use Heckman step by step
I will use a probit model
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probit indp_pay_log board_ind loss_total eps1 Fem_indep , robust cluster(code)
i got this error message
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outcome does not vary; remember:
                                  0 = negative outcome,
        all other nonmissing values = positive outcome
please do you know the reason and how to fix it