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Download full textDong, Nianbo; Lipsey, Mark W. – Society for Research on Educational Effectiveness, 2011
Attrition occurs when study participants who were assigned to the treatment and control conditions do not provide outcome data and thus do not contribute to the estimation of the treatment effects. It is very common in experimental studies in education as illustrated, for instance, in a meta-analysis studying "the effects of attrition on baseline…
Descriptors: Attrition (Research Studies), Educational Research, Scientific Methodology, Research Design
