College GPA variables:

colgpa = freshman year grade point average.

sat = combined sat score

athlete	= 1 if the student is an athelete in a college athletics program, 0 otherise.

hsize = high school size (number of students) in hundreds.

hsrank = student's rank in high shcool graduating class.

hsperc = student's percentile ranking in high school graduating class.

female = 1 if a female student, 0 if male.

white = 1 if white student, 0 otherwise.

black = 1 if black student, 0 otherwise.