More than a third of charter schools "deliver learning results that are significantly worse than their student[s] would have realized had they remained in traditional public schools," according to Stanford University research funded in part by pro-charter groups. "If this study shows anything, it shows that we've got a two-to-one margin of bad charters to good charters," said lead author Margaret E. Raymond, who directs Stanford's Center for Research on Education Outcomes. "That's a red flag."

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