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Download full textRoschelle, Jeremy; Tatar, Deborah; Hedges, Larry; Shechtman, Nicole – Society for Research on Educational Effectiveness, 2010
One purpose of educational research is to provide information about the likely impact of interventions or treatments on policy-relevant populations of students. Randomized experiments are useful for estimating the causal effects of interventions on the students in schools that participate in the experiments. Unfortunately, the samples of schools…
Descriptors: African Americans, Middle Schools, Educational Research, Scaling
Direct linkZimmer, Ron; Gill, Brian; Booker, Kevin; Lavertu, Stephane; Sass, Tim R.; Witte, John – RAND Corporation, 2009
The first U.S. charter school opened in 1992, and the scale of the charter movement has since grown to 4,000 schools and more than a million students in 40 states plus the District of Columbia. With this growth has also come a contentious debate about the effects of the schools on their own students and on students in nearby traditional public…
Descriptors: Charter Schools, Research Methodology, Probability, Student Characteristics
