Methodology
December, 2009
This paper provides practical guidance for researchers who are designing studies that randomize groups to measure the impacts of educational interventions.
Publications
Methodology
July, 2007
No universal guideline exists for judging the practical importance of a standardized effect size, a measure of the magnitude of an intervention’s effects. This working paper argues that effect sizes should be interpreted using empirical benchmarks — and presents three types in the context of education research.
Methodology
Empirical Guidance for Studies That Randomize Schools to Measure the Impacts of Educational Interventions
November, 2005
This paper examines how controlling statistically for baseline covariates (especially pretests) improves the precision of studies that randomize schools to measure the impacts of educational interventions on student achievement.
Methodology
Methodological Lessons from an Evaluation of Accelerated Schools
October, 2001