This report claims that private schools outperform public schools. According to a review by the Think Tank Review Project, the report applied inappropriate models to account for the demographic differences between students.
Lubienski, C. and S. (2006). Review of "On the Public-Private School Achievement Debate." Boulder and Tempe: Education and the Public Interest Center & Education Policy Research Unit. Retrieved [date] from http://epicpolicy.org/thinktank/review-on-public-private-school-achievement-debate