unique individual ID
=1 if working, otherwise
=1 if self-employed, otherwise
age in years
age squared
years of schooling, truncated at 20 years
=1 if has 0-11 years of schooling, 0 otherwise
=1 if has 12 years of schooling, 0 otherwise
=1 if has 13-15 years of schooling, 0 otherwise
=1 if has 16 or more years of schooling, 0 otherwise
=1 if married, 0 if not
=1 if has children ages 0 to 5, otherwise
=1 if has a newborn (<1 years old), otherwise
=1 if has children ages 1 to 5, otherwise
=1 if has children ages 6 to 17, otherwise
locus of control
self esteem score
=1 if urban location, 0 otherwise
AFQT score
=1 if South region, otherwise
=1 if Northeast region, otherwise
=1 if North Central region, otherwise
=1 if West region, otherwise
spouse's income in thousands of dollars
=1 if the frist two children have the same gender, otherwise
EVER STOPPED BY POLICE FOR OTHER THAN MINOR TRAFFIC OFFENSE? 80
unemployment rate in percentage points
individual time mean of sp_inc1000
individual time mean of married