Technical Methods Report: Do Typical RCTs of Education Interventions Have Sufficient Statistical Power for Linking Impacts on Teacher Practice and Student Achievement Outcomes?

NCEE 2009-4065
October 2009

Chapter 1: Introduction
Chapter 2: Definition of a Mediator
Chapter 3: Theoretical Framework
Chapter 4: Statistical Power Formulas
Chapter 5: Empirical Analysis
Chapter 6: Summary and Conclusions
Appendix A: Proof of Equation (18)
References
List of Tables
List of Figures
PDF & Related Info

Chapter 3: Theoretical Framework

This chapter discusses the mathematical framework for the statistical power analysis, including the assumptions and basic regression models that are used for the analysis, and the general approach for calculating statistical power.