unique person identifier
survey year
ln(hourly wage rate)
work experience in current job
=exp^2
=1 if married
=1 if ever married
=1 if currently enrolled
years of formal education
respondent's current age
birth cohort
grouped year (1=1979-80, 2=1981-85, 3=1986-90, 4=1991-95 5=1996-2000)
yeargr==     1.0000
yeargr==     2.0000
yeargr==     3.0000
yeargr==     4.0000
yeargr==     5.0000