http://www.publicpurpose.com/pp-edpp.htm
To summarize, not only do private schools cost
30% less than private schools, and this includes the more expensive elite schools. It is 42% without them. More importantly, results; pick your subject. In reading proficiency for 4th grade, private students score 14% higher, in 8th grade 21% higher, and 12th grade 16% higher. Math? 4th grade is 4% higher, 8th is 20% higher and 12th is 22% higher. Private students have a 5% higher graduation rate. They are also
250% more likely to graduate from college. They are not only doing more, they are doing it with less.