During the past few decades, Charter schools have been utilized as laboratories for educational innovation. Each year, more and more Charter schools open across the United States. These schools are governed the same way traditional public schools are, but there is research that suggests that inequalities exist in the representation and performance…

This paper provides the first population-based evidence on how much standardized test scores vary among public school districts within each state and how segregation explains that variation. Using estimates based on roughly 300 million test score records in math and English Language Arts (ELA) for Grades 3 through 8 from every U.S. public school…