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Konstantopoulos, Spyros – Journal of Experimental Education, 2010
Previous work on statistical power has discussed mainly single-level designs or 2-level balanced designs with random effects. Although balanced experiments are common, in practice balance cannot always be achieved. Work on class size is one example of unbalanced designs. This study provides methods for power analysis in 2-level unbalanced designs…
Descriptors: Class Size, Computers, Statistical Analysis, Experiments
Pituch, Keenan A.; Murphy, Daniel L.; Tate, Richard L. – Journal of Experimental Education, 2009
Due to the clustered nature of field data, multi-level modeling has become commonly used to analyze data arising from educational field experiments. While recent methodological literature has focused on multi-level mediation analysis, relatively little attention has been devoted to mediation analysis when three levels (e.g., student, class,…
Descriptors: Research Design, Educational Experiments, Models, Mediation Theory

Marsh, Herbert W. – Journal of Experimental Education, 1998
Eight variations of a general matching design, matching program participants and a control group, were studied through simulation, for their effectiveness in evaluating programs for the gifted and talented. A regression-discontinuity design provided the best approach, with unbiased estimates of program effects. (SLD)
Descriptors: Control Groups, Gifted, Matched Groups, Program Evaluation

Adair, John G.; And Others – Journal of Experimental Education, 1990
A review and meta-analysis were made of placebo control groups in educational experiments. In all, 125 studies were clustered into procedures that included (1) explicit manipulation of attentional elements; (2) explicit description of the placebo activity plus implied reference to attention; and (3) exclusive reference to the activity. (SLD)
Descriptors: Attention, Control Groups, Educational Research, Effect Size