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Bloom, Howard S.; Spybrook, Jessaca – Journal of Research on Educational Effectiveness, 2017
Multisite trials, which are being used with increasing frequency in education and evaluation research, provide an exciting opportunity for learning about how the effects of interventions or programs are distributed across sites. In particular, these studies can produce rigorous estimates of a cross-site mean effect of program assignment…
Descriptors: Program Effectiveness, Program Evaluation, Sample Size, Evaluation Research
Spybrook, Jessaca; Lininger, Monica; Cullen, Anne – Society for Research on Educational Effectiveness, 2011
The purpose of this study is to extend the work of Spybrook and Raudenbush (2009) and examine how the research designs and sample sizes changed from the planning phase to the implementation phase in the first wave of studies funded by IES. The authors examine the impact of the changes in terms of the changes in the precision of the study from the…
Descriptors: Evaluation Criteria, Sampling, Research Design, Planning