How teacher turnover harms student achievement

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This study estimates the effects of teacher turnover on over 850,000 New York City 4th and 5th grade student observations over eight years. The results indicate that students in grade-levels with higher turnover score lower in both ELA and math and that this effect is particularly strong in schools with more low-performing and black students. Moreover, the results suggest that there is a disruptive effect of turnover beyond changing the distribution in teacher quality.

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