Whether all students using state grants for private school tuition did better, the same or worse than all students in public schools has little value in assessing the program.
Why?
First, it’s comparing apples to oranges. It’s equating, for the most part, a limited number of struggling students who left struggling public schools to public school students as a whole.
Second, the most vital question is: Did those students who left their public school improve their test scores year over year?
Third, but perhaps most important to parents, is the student improving study habits, enjoyment of school, making academic progress, making social progress?