Gr 4 Math Change: Change in NAEP Grade 4 Math scale scores between 2003 and 2005
Gr 8 Math Change:  Change in NAEP Grade 8 Math scale scores between 2003 and 2005
Gr 4 Reading  Change:  Change in NAEP Grade 4 Reading scale scores between 2003 and 2005
Gr 8 Reading  Change: Change in NAEP Grade 8 Reading scale scores between 2003 and 2005
Gr 8 Math Poverty-Gap Scale Score: Difference in 2005 NAEP Grade 8 Math scale scores for National School Lunch Program noneligible students vs. eligible students 
Gr 8 Math Poverty-Gap Change:  Change in NAEP Grade 8 Math poverty-gap scale scores between 2003 and 2005 (negative value = narrowing gap).
Graduation Rate Change:  Change in graduation rate for all students in public schools between 2000 and 2003.
High AP Test Scores: Scores of 3 or above per 100 students in Grades 11 and 12 in public schools.
Change in High AP Test Scores:  Change in number of AP scores of 3 or above per 100 students between 2000 and 2005.