Although Individual Disabilities Education Act of 2004 (IDEA) has mandated states to collect and analyze data to determine if special education disproportionality is occurring within the local education agencies (LEAs), student of color continue to be disproportionately represented in special education programs. Historical trend data revealed that…

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.…