This is said better than I could say so many thanks to Diane Ravitch, NEPC, and ROR and the researchers who critiqued this incredible CREDO, “study”.
The National Education Policy Center urges caution when reading the CREDO study of charter schools in New Orleans. Governor Bobby Jindal has already taken CREDO as evidence for the success of privatization.
NEPC says not so fast. In addition to technical issues in the study, the critics make the following observations:
“Even setting aside these concerns, the effect sizes reported for New Orleans—let alone for the state as a whole—are not impressive in terms of absolute magnitude. Differences of 0.12 standard deviations in reading and 0.14 in mathematics indicate that less than one half of one percent of the variation in test scores is explainable by membership in a charter school.
“The study’s methods raise concerns that the findings could easily be misinterpreted to inflate pro-charter conclusions. In context, there’s little to crow about: the results from Louisiana and New Orleans are not much different from the uninspiring national results…
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