Hammie, consider theses ideas with respect to your statistical point:
1) Education isn't a simple measurement of a static item. Its possible that public schools are improving. Could this be because of competition? I don't know -- but it fits my view of the world where bureaucracies change little unless they have to.
2) The whole idea of charters is to allow innovation and freedom. One should expect that charters are a group won't do much differently than schools in general. But what really matters is whether there are individual schools that are doing better. The entire educational world should then be learning from success, and improving itself.
3) Don't put too much weigh on simple statistics created by someone with a vested interest. You can just as easily find other studies.
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