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by equark 5747 days ago
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=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/Charte...