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Tipton, Elizabeth; Spybrook, Jessaca; Fitzgerald, Kaitlyn G.; Wang, Qian; Davidson, Caryn – Educational Researcher, 2021
As a result of the evidence-based decision-making movement, the number of randomized trials evaluating educational programs and curricula has increased dramatically over the past 20 years. Policy makers and practitioners are encouraged to use the results of these trials to inform their decision making in schools and school districts. At the same…
Descriptors: Randomized Controlled Trials, Educational Research, Institutional Characteristics, Participant Characteristics
Chan, Wendy – Journal of Research on Educational Effectiveness, 2017
Recent methods to improve generalizations from nonrandom samples typically invoke assumptions such as the strong ignorability of sample selection, which is challenging to meet in practice. Although researchers acknowledge the difficulty in meeting this assumption, point estimates are still provided and used without considering alternative…
Descriptors: Generalization, Inferences, Probability, Educational Research
Miciak, Jeremy; Taylor, W. Pat; Stuebing, Karla K.; Fletcher, Jack M.; Vaughn, Sharon – Journal of Research on Educational Effectiveness, 2016
An appropriate estimate of statistical power is critical for the design of intervention studies. Although the inclusion of a pretest covariate in the test of the primary outcome can increase statistical power, samples selected on the basis of pretest performance may demonstrate range restriction on the selection measure and other correlated…
Descriptors: Educational Research, Research Design, Intervention, Statistical Analysis
Tipton, Elizabeth – Society for Research on Educational Effectiveness, 2013
Recent research on the design of social experiments has highlighted the effects of different design choices on research findings. Since experiments rarely collect their samples using random selection, in order to address these external validity problems and design choices, recent research has focused on two areas. The first area is on methods for…
Descriptors: Experiments, Research Methodology, Middle Schools, Secondary School Mathematics
Bell, Stephen H.; Puma, Michael J.; Cook, Ronna J.; Heid, Camilla A. – Society for Research on Educational Effectiveness, 2013
Access to Head Start has been shown to improve children's preschool experiences and school readiness on selected factors through the end of 1st grade. Two more years of follow-up, through the end of 3rd grade, can now be examined to determine whether these effects continue into the middle elementary grades. The statistical design and impact…
Descriptors: Evaluation Methods, Data Analysis, Randomized Controlled Trials, Sampling