worker id
age in years
years of education
union dummy
yearly labor income (1982$)
yearly hours of work
years of tenure, present job
occup of main job
year of survey
=1 if respondent black
=1 if professional
=1 if manager
=1 if sales
=1 if clerk
=1 if in craft occup
=1 if machine operator
=1 if transit
=1 if in service sector