# Use Ray Fair's extra-marital affairs data, as reproduced
# by William Greene
open greene22_2

# display the definitions of the variables
labels

# The variable 'Z8' is the self-rating of marriage:
# we subtract one to give a base of zero, mark the resulting
# variable as discrete, examine its frequency distribution,
# then relate it to gender (Z1) and age in years (Z2)
series rat = Z8 - 1
discrete rat 
freq rat

# ordered probit
probit rat 0 Z1 Z2
probit rat 0 Z1 Z2 --robust

# ordered logit
logit rat 0 Z1 Z2
logit rat 0 Z1 Z2 --robust