New Ohio Study: Charters perform no better that regular schools; often worse
‘The difference between the two types of schools in the probability of receiving “excellent” or better (-0.02, or two percent) is small and not statistically significant. The other two differences, on the other hand, are both large and significant. Charter schools are 13 percent less likely to receive a rating of “effective” or better, and they are 22 percent less likely to receive “continuous improvement” or better….’