monthly earnings
log of wage
average weekly hours
IQ Score
Knowledge of world work score
Years of Education
Years of work experience
Years with current employer
Age in years
=1 if married, 0 otherwise
=1 if black, 0 otherwise
=1 if lived in south, 0 otherwise
=1 if live in SMSA, 0 otherwise
Number of siblings
Birthorder
Mother's Education
Father's Education