person identifier
1980 to 1987
=1 if black
labor mkt experience
=1 if Hispanic
annual hours worked
=1 if married
=1 if Professional, Technical and kindred
=1 if Managers, Offcials and Proprietors
=1 if Sales Workers
=1 if Clerical and kindred
=1 if Craftsmen, Foremen and kindred
=1 if Operatives and kindred
=1 if Laborers and farmers
=1 if Farm Laborers and Foreman
=1 if Service Workers
years of schooling
=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