This study evaluates the Youth Development Program (YDP), a component of the federal Workforce Investment Act (WIA). We examine whether the YDP reduced dropout rates among youth in secondary schools in seven school districts in the impoverished Mississippi River Delta in southeast Arkansas. Initially, the program seems to have an impact. Students…

Background: Cluster-randomized experiments that assign intact groups such as schools or school districts to treatment conditions are increasingly common in educational research. Such experiments are inherently multilevel designs whose sensitivity (statistical power and precision of estimates) depends on the variance decomposition across levels.…