0 = male
1 = female

father's education
2 = < h.s. grad
3 = h.s. grad
4 = < 2 yrs voc
5 = 2 yrs voc
6 = < 2 yrs coll
7 = > 2 yrs coll
8 = coll grad
9 = master's
10 = MD/PhD

mother's education
2 = < h.s.
3 = h.s. grad
4 = < 2 yrs voc
5 = 2 yrs voc
6 = < 2 yrs coll
7 = > 2 yrs coll
8 = coll grad
9 = master's
10 = MD/PhD

algebra 1 in h.s.
0 = not taken
1 = taken

math grades
0 = less A-B
1 = most A-B

grades in h.s.
1 = less than D
2 = mostly D
3 = half CD
4 = mostly C
5 = half BC
6 = mostly B
7 = half AB
8 = mostly A

math achievement test
-8.33 = low
25 = high

mosaic, pattern test
-4 = Low
56 = high

visualization test
-4 = low
16 = high

visualization retest
0 = Lowest
9.5 = highest

scholastic aptitude test - math
200 = minmum score
500 = average score
800 = maximum score

ethnicity
1 = Euro-Amer
2 = African-Amer
3 = Latino-Amer
4 = Asian-Amer
98 = multiethnic
99 = blank

1 = protestant
2 = catholic
3 = no religion
98 = other religion
99 = blank

ethnicity reported by student
1 = Euro-Amer
2 = Afican-Amer
3 = Latino-Amer
4 = Asian-Amer
98 = multiethnic
99 = blank

item01 motivation
1 = not at all typical
4 = very typical

item04 reversed
1 = typical
4 = not at all typical

competence scale
1 = Lowest
4 = Highest