hourly wage, 1991
abil. measure, not standardized
highest grade completed by 1991
=1 if in northeast, 1991
=1 if in nrthcntrl, 1991
=1 if in west, 1991
=1 if in south, 1991
potential experience
highest grade, mother
highest grade, father
=1 if broken home, age 14
number of siblings
=1 if in urban area, 1991
=1 if in NE, age 18
=1 if in NC, age 18
=1 if in south, age 18
=1 if in west, age 18
=1 if in urban area, age 18
college tuition, age 17
college tuition, age 18
log(wage)
exper^2
tuit18 - tuit17