Peterson said some questions do remain over exactly how to interpret the data from his study, but added that there is no controversy over the importance of the findings to the voucher debate.
No Debate Among Academics?
In New York, black students' test scores over the grades analyzed rose four percent. This number, Peterson said, is not and should not be under debate.
"Those findings are not in any way disputed by Mathematica. They agree that the effects in New York were statistically significant," Peterson said.
However, when the figures were broken down by grade, Mathematica found no increase in test scores among third through fifth graders, with the only significant increase in the sixth grade classes.
It was this analysis that prompted the press release.
"Until we understand this better, we cannot place much policy weight on it," the release quoted David Myers, an investigator in the study, as saying.
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