age: age in years
work: hours worked per week
study: hours studying per week
econhs: =1 if economics in high school
colgpa: college GPA, beginning semester
hsgpa: high school GPA
acteng: ACT English score
actmth: ACT math score
act: ACT composite
mathscr: math quiz score, 0-10
male: =1 if male
calculus: =1 if taken calculus course
attexc: =1 if past attndce 'excellent'
attgood: =1 if past attndce 'good'
fathcoll: =1 if father has BA
mothcoll: =1 if mother has BA
score: course score, in percent