Now why do you suppose that might be?
Because vouchers add competition to the equation so the schools are forced to improve. ECON 101.
Or it could be that...
(a) Those that receive vouchers are attending Private Schools, if they were rejected by Private Schools the student remained in the Public School and didn't count as using a voucher.
(b) Private schools are free to reject students and expel students for behavioral or academic problems. Again those students are then returned to the Public Schools system.
It's pretty easy to show improved graduation rates when (a) the school can pick and choose students, and (b) get rid of students. It's harder to improve scores and rates when you are mandated by law to accept all students, expend a great amount of effort to keep them in school, and be where it very difficult to expel students.
Common Sense 101.
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Great point(s). I had a student last year physically push me in the cafeteria. He was back in school within 2 weeks. Most middle-class/upper class Americans have this glorified idea of what teenagers are like. They think they're just normal high school kids...until you're face to face with a classroom with Bloods and Latin Kings that is (who mind you tend to be the most respectful students-as they have nothing to prove to their peers). Opinions tend to change quickly when you start spotting gang tattoos on students and realize that somebody's Johnny and Susie are in a class with "kids" who've been arrested for armed burglary (with a firearm that they've acquired illegally). Some people want to compare dropout and test rates between classrooms of those students and entitled wealthy kids? What a joke.