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# Fair's extra-marital affairs data
open greene22_2.gdt
# initial OLS
ols Y 0 Z2 Z3 Z5 Z7 Z8
# Tobit version
tobit Y 0 Z2 Z3 Z5 Z7 Z8
# Probit version with dummified dependent variable
series Ydum = Y > 0
probit Ydum 0 Z2 Z3 Z5 Z7 Z8