You underestimate researchers. Recent research on charter schools uses randomized assignment, induced by oversubscribed schools. They often find large positive

You underestimate researchers. Recent research on charter schools uses randomized assignment, induced by oversubscribed schools. They often find large positive effects: http://papers.ssrn.com/sol3/papers.cfm?abstract_id=1517008 http://papers.ssrn.com/sol3/papers.cfm?abstract_id=1517008 http://papers.ssrn.com/sol3/papers.cfm?abstract_id=1550609 http://papers.ssrn.com/sol3/papers.cfm?abstract_id=1550609 Not surprisingly, the results depend on the school type and some charter schools don't work or only help specific groups: http://www.mathematica-mpr.com/newsroom/releases/2010/Charterschool_6_10.asp http://www.mathematica-mpr.com/newsroom/releases/2010/Charte...