Another 18 school districts enroll more than 20 percent of public school students in charter schools (see Figure 1). (educationnext.org)
Here are the 10 school systems with the highest percentage of students in charter schools. (asumag.com)
Far more sophisticated studies with better controls on variables, however, consistently show either no achievement benefits, or small achievement benefits for students in charter schools. (washingtonpost.com)