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Publications

Methodology

New Empirical Evidence for the Design of Group Randomized Trials in Education

December, 2009

This paper provides practical guidance for researchers who are designing studies that randomize groups to measure the impacts of educational interventions.

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

Extending the Reach of Randomized Social Experiments

New Directions in Evaluations of American Welfare-to-Work and Employment Initiatives

October, 2001
Methodology

Measuring the Impacts of Whole-School Reforms

Methodological Lessons from an Evaluation of Accelerated Schools

October, 2001