Search EdWorkingPapers

Search for EdWorkingPapers here by author, title, or keywords.

Helen (Sunny) Ladd

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.

More →


Lucy C. Sorensen, Helen F. Ladd.

High teacher turnover imposes numerous costs on the schools and districts from which teachers depart. This study asks how schools respond to spells of high teacher turnover, and assesses organizational and human capital losses in terms of the changing composition of the teacher pool. Our analysis uses more than two decades of linked administrative data on math and ELA teachers at middle schools in North Carolina to determine school responses to turnover across different policy environments and macroeconomic climates. We find that, even after accounting for school contexts and trends, turnover has marked, and lasting, negative consequences for teacher quality and student achievement. Our results highlight the need for heightened policy attention to issues of teacher retention and working conditions.

More →