 The study was conducted by American Institutes for Research which examined how many students attained performance levels that exceed statistical expectations given the school's relative level of student poverty, as measured by state accountability test scores for all the school's students in the core subjects of reading and math.The study also examined the success rate for the school's least advantaged student groups (e.g., black, Hispanic, and economically disadvantaged students) that exceed state averages.The study included 752 high schools in Pennsylvania, including traditional public schools, public charter schools and public magnet schools.