"A careful analysis of test score gains by David Figlio of Northwestern University has found a modest but statistically significant gains for Florida tax credit students," Matt Ladner
reports. "Money quote from the study, with a definite echo of previous random assignment studies: 'These differences, while not large in magnitude, are larger and more statistically significant than in the past year’s results, suggesting that successive cohorts of participating students may be gaining ground over time.'"
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