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Peer reviewedMacMillan, Donald L.; And Others – Exceptionality: A Research Journal, 1990
Arguing that reliable and valid dropout rate estimates are prerequisite to establishment of causal factors and intervention programs, this article examines differences in definitions of dropouts, computational methods, and the complexities in defining cohorts, as well as the importance of sample attrition. Several sources of error are discussed.…
Descriptors: Attrition (Research Studies), Definitions, Disabilities, Dropout Rate
Download full textSt. Pierre, Robert G.; Proper, Elizabeth C. – 1976
A general interest in attrition, or loss of units from a study, stems in part from the observation that the infrequency of attention to attrition exacerbates problems of data interpretation. As a substudy of the national evaluation of Project Follow Through, the potential biasing effects of attrition of subjects from the sites were investigated.…
Descriptors: Analysis of Covariance, Attrition (Research Studies), Compensatory Education, Data Collection
