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Direct linkValentine, Jeffrey C.; McHugh, Cathleen M. – Psychological Methods, 2007
Using meta-analysis, randomized experiments in education that either clearly did or clearly did not experience student attrition were examined for the baseline comparability of groups. Results from 35 studies suggested that after attrition, the observed measures of baseline comparability of groups did not differ more than would be expected given…
Descriptors: Sampling, Effect Size, Student Attrition, Educational Research
Peer reviewedEdgington, Eugene S. – Educational Administration Quarterly, 1985
Explains the characteristics and importance of random assignment in experimental research on education. Considers factors supporting causal inferences, the nature of "assignment units," differences between random sampling and random assignment, the characteristics of randomization tests, forms of random assignment, and effects of experimental…
Descriptors: Educational Experiments, Educational Research, Experimental Groups, Research Design
