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I sense Ezra Klein did not enjoy writing this piece about new pre-K research:
Perhaps preschool doesn’t help children as much as we thought — or hoped. A new study by Mark Lipsey, Dale Farran, and Kerry Hofer finds that children who were admitted to Tennessee’s pre-K program were worse off by the end of first grade than children who didn’t make the cut.
The study is beautifully designed — it takes advantage of areas in Tennessee where demand for the program outstripped supply, so entrance to the program was decided randomly. That means researchers could compare outcomes for kids who randomly got in with outcomes for those who randomly didn’t, and isolate the effects of the program. What they found should worry advocates of universal pre-K.