In an otherwise fine September 22nd article on a new study showing that New York City students who win a lottery to enroll in charter schools outperform those who don’t win spots, John Hechinger and Ianthe Jeanne Gugan write in the Wall Street Journal:

Critics of charter schools have long argued that any higher test scores were not necessarily attributable to anything the schools were doing, but to the students themselves, on the premise that only the most motivated students and families elected charters. Ms. Hoxby’s study sought to address that argument by comparing students who attend charters directly with

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