student identifier
= 1 if African-American
= 1 if Hispanic
= 1 if female
year of first application: 90 to 93
math NCE test score, 1994
= 1 if ever selected to attend choice school
= 1 if attending choice school, 1994
years selected to attend choice school
years attended choice school
mnce in 1990
= 1 if selectyrs == 1
= 1 if selectyrs == 2
= 1 if selectyrs == 3
= 1 if selectyrs == 4
= 1 if choiceyrs == 1
= 1 if choiceyrs == 2
= 1 if choiceyrs == 3
= 1 if choiceyrs == 4