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Publications

Methodology

Using Covariates to Improve Precision

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

Using Cluster Random Assignment to Measure Program Impacts

Statistical Implications for the Evaluation of Education Programs

August, 1999