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

X2 Student's sex
-9 = Missing
-8 = Unit non-response
-7 = Item legitimate skip/NA
-6 = Component not applicable
1 = Male
2 = Female

X2 Student's race/ethnicity-composite
-9 = Missing
-8 = Unit non-response
-7 = Item legitimate skip/NA
-6 = Component not applicable
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

X2 Mathematics standardized theta score
-9 = Missing
-8 = Unit non-response
-7 = Item legitimate skip/NA
-6 = Component not applicable
-4 = Item not administered: abbreviated interview

X2 Parents'/guardians' highest level of education
-9 = Missing
-8 = Unit non-response
-7 = Item legitimate skip/NA
-6 = Component not applicable
0 = No bio/adoptive/step-parent in household
1 = Less than high school
2 = High school diploma or GED or alterntive HS credential
3 = Certificate/diploma from school providing occupational training
4 = Associate's degree
5 = Bachelor's degree
6 = Master's degree
7 = Ph.D/M.D/Law/other high lvl prof degree

X2 P1-P2 relationship pattern
-9 = Missing
-8 = Unit non-response
-7 = Item legitimate skip/NA
-6 = Component not applicable
1 = Two bio/adoptive parents
2 = Bio/adoptive mother and non-bio/adoptive partner
3 = Bio/adoptive mother and non-partner guardian
4 = Bio/adoptive father and non-bio/adoptive partner
5 = Bio/adoptive father and non-partner guardian
6 = Two other guardians
7 = Bio/adoptive mother only
8 = Bio/adoptive father only
9 = Other female guardian only
10 = Other male guardian only
11 = Student lives with P1/P2 less than half the time

X2 Total family income from all sources 2011
-9 = Missing
-8 = Unit non-response
-7 = Item legitimate skip/NA
-6 = Component not applicable
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 Quintile coding of X2SES composite
-9 = Missing
-8 = Unit non-response
-7 = Item legitimate skip/NA
-6 = Component not applicable
1 = First quintile (lowest)
2 = Second quintile
3 = Third quintile
4 = Fourth quintile
5 = Fifth quintile (highest)

X2 School control
-9 = Missing
-8 = Unit non-response
-7 = Item legitimate skip/NA
-6 = Component not applicable
1 = Public
2 = Catholic or other private