From the press release:
While the number of charter schools continues to grow, debate continues about whether charter schools provide a better education experience than traditional public schools. Proponents contend that charter schools expand educational choices for students, increase innovation, improve student achievement and provide much-needed competition to public schools.
Opponents, meanwhile, argue that charter schools lead to increased racial or ethnic stratification of students, skim the best students from traditional public schools, reduce resources for public schools and provide no real improvement in student achievement.
A new RAND Corporation study examining charter schools in Chicago, San Diego, Philadelphia, Denver, Milwaukee, and the states of Ohio, Texas and Florida is the first to use longitudinal, student-level data to systematically examine these issues across multiple communities and varied charter laws.