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Helen (Sunny) Ladd

Lucy C. Sorensen, Helen F. Ladd.

High teacher turnover imposes numerous burdens on the schools and districts from which teachers depart. Some of these burdens are explicit and take the form of recruiting, hiring and training costs. Others are more hidden and take the form of changes to the composition and quality of the teaching staff. This study focuses on the latter. We ask how schools respond to spells of high teacher turnover, and assess organizational and human capital effects. Our analysis uses two decades of administrative data on math and ELA middle school teachers in North Carolina to determine school responses to turnover across different policy environments and macroeconomic climates. Based on models controlling for school contexts and trends, we find that turnover has marked, and lasting, negative consequences for the quality of the instructional staff and student achievement. Our results highlight the need for heightened policy attention to school specific issues of teacher retention.

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Charles T. Clotfelter, Steven W. Hemelt, Helen F. Ladd, Mavzuna Turaeva.

We document patterns and trends in school segregation by racial/ethnic group and by family income in North Carolina between 1998 and 2016, a period of rapid immigration, decline in federal oversight, and growth of charter schools. Accounting for students in both public and private schools, we find that segregation generally increased over the period, with the increase concentrated in urban areas. In addition, low-income students became more segregated from other students during the period. We measure and decompose segregation in metropolitan areas, finding that more than half can be attributed to racial disparities inside school districts, but in some counties private schools, charter schools, or multiple districts played a deciding role. We also find that segregation between white and Hispanic students increased sharply. We note several policy levers available at the local and state level.

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