=1 for NSW participants, =0 otherwise
age in years
years of education
=1 if African-American, =0 otherwise
=1 if Hispanic, =0 otherwise
=1 if married, =0 otherwise
real (inflation adjusted) earnings for 1974
real (inflation adjusted) earnings for 1975
real (inflation adjusted) earnings for 1978
=1 if unemployed in 1974, =0 otherwise
=1 if unemployed in 1975, =0 otherwise
=1 if unemployed in 1978, =0 otherwise