Effect sizes are commonly reported for the results of educational interventions. However, researchers struggle with interpreting their magnitude in a way that transcends generic guidelines. Effect sizes can be interpreted in a meaningful context by benchmarking them against typical growth for students in the normative distribution. Such benchmarks…

Effect sizes are commonly reported for the results of educational interventions. However, researchers struggle with interpreting their magnitude in a way that transcends generic guidelines. Effect sizes can be interpreted in a meaningful context by benchmarking them against typical growth for students in the normative distribution. Such benchmarks…

The Follow Through experience is beginning to provide compelling evidence bearing upon important policy issues in compensatory education. This evidence, coming as it does from a naturalistic quasi-experiment, cannot draw its plausibility from the conventional statistical inference appropriate to probabilistically-constructed true experiments. The…