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Enrollment Flexibility and Charter School Impacts: The Effect of Backfill on Students in Massachusetts Charter Middle Schools

This study leverages Massachusetts’s adoption of a statewide requirement for charter schools to backfill vacancies within some grades to provide the first causal estimates for the effect of incorporating new students on the performance of incumbent charter school pupils. Using data from the universe of Massachusetts public school students enrolled in Grades 5 through 8 from 2007-2008 to 2013-2014, this study compares changes in student achievement in impacted vs. not-impacted grades within Boston charter schools to the patterns of student achievement within traditional public schools and charter schools outside of Boston.

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