The purpose of this paper is to showcase new research that seeks to provide guidance on the heterogeneity of treatment effects by utilizing the variance of demographic differences in state assessments. This study is focused on a simple randomized block design where students are nested within schools, and within each school students are randomized…

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.…

Given the international need to improve student learning, there is nothing more important than classroom teachers. Obtaining a deeper understanding of effective classrooms is a priority if educational reform efforts are to succeed in any educational system around the world. In the last decade, educational researchers have expanded the knowledge…

The authors sought to determine if an urban school district's effort to fundamentally change teaching, assessment, and intervention practices increased student achievement and decreased achievement variation among classrooms in 11 high schools. They examined Grade 11 mathematics achievement data from the 2009-2010 and 2010-2011 Kentucky Core…

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.…

The primary purpose of this study was to determine if there was a difference between self-contained and departmentalized classroom organization on the Kentucky Core Content Test (KCCT) in reading and mathematics for students in fourth and fifth grade. A secondary purpose of this study was to consider how these organizational structures affect the…