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Random Assignment Of Schools To Groups In The Drug Resistance Strategies Rural Project: Some New Methodological Twists, John W. Graham, Jonathan Pettigrew, Michelle Miller-Day, Janice L. Krieger, Jiangxiu Zhou, Michael L. Hecht

Communication Faculty Articles and Research

Random assignment to groups is the foundation for scientifically rigorous clinical trials. But assignment is challenging in group randomized trials when only a few units (schools) are assigned to each condition. In the DRSR project, we assigned 39 rural Pennsylvania and Ohio schools to three conditions (rural, classic, control). But even with 13 schools per condition, achieving pretest equivalence on important variables is not guaranteed. We collected data on six important school-level variables: rurality, number of grades in the school, enrollment per grade, percent white, percent receiving free/assisted lunch, and test scores. Key to our procedure was the inclusion of …