Student ID
-7 = Item legitimate skip/NA
-8 = Unit non-response
-9 = Missing

X1 Student dual-first language indicator
-9 = Missing
-8 = Unit non-response
-7 = Item legitimate skip/NA
1 = First language is English only
2 = First language is a non-English language only
3 = First language is English and non-English equally

X1 Student's race/ethnicity-composite
-9 = Missing
-8 = Unit non-response
-7 = Item legitimate skip/NA
0 = No bio/adoptive/step-parent in household
1 = Amer. Indian/Alaska Native, non-Hispanic
2 = Asian, non-Hispanic
3 = Black/African-American, non-Hispanic
4 = Hispanic, no race specified
5 = Hispanic, race specified
6 = More than one race, non-Hispanic
7 = Native Hawaiian/Pacific Islander, non-Hispanic
8 = White, non-Hispanic

X1 Mathematics theta score
-9 = Missing
-8 = Unit non-response
-7 = Item legitimate skip/NA
-6 = Component not applicable

X1 Poverty indicator (relative to 100% of Census poverty threshold)
-9 = Missing
-8 = Unit non-response
-7 = Item legitimate skip/NA
0 = At or above poverty threshold
1 = Below poverty threshold

X1 Total family income from all sources 2008
-9 = Missing
-8 = Unit non-response
-7 = Item legitimate skip/NA
1 = Family income less than or equal to $15,000
2 = Family income > $15,000 and <= $35,000
3 = Family income > $35,000 and <= $55,000
4 = Family income > $55,000 and <= $75,000
5 = Family income > $75,000 and <= $95,000
6 = Family income > $95,000 and <= $115,000
7 = Family income > $115,000 and <= $135,000
8 = Family income > $135,000 and <= $155,000
9 = Family income > $155,000 and <=$175,000
10 = Family income > $175,000 and <= $195,000
11 = Family income > $195,000 and <= $215,000
12 = Family income > $215,000 and <= $235,000
13 = Family income > $235,000

X2 Ever dropout
-9 = Missing
-8 = Unit non-response
-7 = Item legitimate skip/NA
0 = No
1 = Yes

X3 Ever dropout
-9 = Missing
-8 = Unit non-response
-7 = Item legitimate skip/NA
-6 = Component not applicable
-4 = Item not administered: abbreviated interview
0 = No known dropout episode
1 = At least one known dropout episode