More Than Main Effects: Designing Randomized Experiments to Test Moderators and Mediators of Student Achievement

Presentation Date: 

Monday, November 2, 2009


STEM Education Research Designs, Conceptual and Practical Considerations for Planning Experimental Studies, National Science Foundation

Presentation Slides: 


  • What are moderators and mediators (conceptual framework)

  • Concrete example from RCT of READ 180 (statistical framework)

  • Discuss results from RCT using different statistical models

  • Conclude with key lessons relevant to RCTs in various content areas (literacy, math, science)