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.
Empirical Guidance for Studies That Randomize Schools to Measure the Impacts of Educational Interventions
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.
Findings from the Extended-Service Schools Initiative
Launched in 1997, the Extended-Service Schools (ESS) Initiative helped establish after-school programs in 17 communities across the country, each of which adapted one of four program models to local circumstances and needs.