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Direct linkRaudenbush, Stephen W.; Martinez, Andres; Spybrook, Jessaca – Educational Evaluation and Policy Analysis, 2007
Interest has rapidly increased in studies that randomly assign classrooms or schools to interventions. When well implemented, such studies eliminate selection bias, providing strong evidence about the impact of the interventions. However, unless expected impacts are large, the number of units to be randomized needs to be quite large to achieve…
Descriptors: Statistical Analysis, Employment Programs, Intervention, Group Behavior
