person identifier
1980 to 1987
=1 if in agriculture
=1 if black
=1 if business & repair serv.
=1 if in construction
=1 if entertainment
labor mkt experience
=1 if finance
=1 if Hispanic
=1 if in poor health
annual hours worked
=1 if in manufacturing
=1 if married
=1 if mining
=1 if north central
=1 if north east
=1 if professional, technical
=1 if mgr, official, proprietor
=1 if sales
=1 if clerical
=1 if craftsman, foreman
=1 if operative
=1 if laborer, farmer
=1 if farm laborer, foreman
=1 if service
=1 if personal service
=1 if professional & related
=1 if public administration
=1 if live in rural area
=1 if south
years of schooling
=1 if transportation
=1 if trade
=1 if in union
log(wage)
=1 if year == 1981
=1 if year == 1982
=1 if year == 1983
=1 if year == 1984
=1 if year == 1985
=1 if year == 1986
=1 if year == 1987
exper^2