Monthly earnings
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
1 if black
1 if live in south
1 if live in SMSA
Number of siblings
Birth order
Mother's education
Father's education
log(wage)
1 if at least one parent attended college
1 if attended college
1 if father attended college