1. Optimal Design of Experimental Studies Investigating Moderation and Main Effects.
Experimental studies investigating moderation and main effects provide the source material for improving the quality of and equity in education by delineating the impact of an intervention, and the contexts, conditions, and sub-populations for which it is most effective. Despite sustained interest in experimental studies, the literature has not developed accessible optimal sampling strategies to help plan powerful and efficient designs to detect these effects. This project, funded by the Spencer Foundation, aims to develop a flexible optimal design framework so that we can design well-powered studies with minimal financial resources. Preliminary results show that the proposed framework can identify much more efficient or powerful designs when contrasted with conventional design frameworks. This project has the potential for broad impacts because it facilitates a fundamental shift in the principles and strategies of study design.
2. Optimal Design of Experiments Investigating Mediation Effects.
Experimental studies investigating the mechanisms of interventions through mediation analyses often lay the groundwork for the critical development and iterative improvement of programs/policies aiming to improve key outcomes. Despite growing interest in employing mediation studies, the literature has not developed accessible optimal design strategies for experimental studies investigating mediation effects. This project aims to develop statistical power formulas and flexible optimal design frameworks for experiments investigating mediation effects by maximizing the statistical power under a fixed budget or minimizing the budget to achieve a fixed power.