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Download full textDong, Nianbo – Society for Research on Educational Effectiveness, 2012
This paper is based on previous studies in applying propensity score methods to study multiple treatment variables to examine the causal moderator effect. The propensity score methods will be demonstrated in a case study to examine the causal moderator effect, where the moderators are categorical and continuous variables. Moderation analysis is an…
Descriptors: Probability, Statistical Analysis, Case Studies, Intervention
Peer reviewedUnlu, Fatih; Layzer, Carolyn; Clements, Douglas; Sarama, Julie; Cook, David – Society for Research on Educational Effectiveness, 2013
Many educational Randomized Controlled Trials (RCTs) collect baseline versions of outcome measures (pretests) to be used in the estimation of impacts at posttest. Although pretest measures are not necessary for unbiased impact estimates in well executed experimental studies, using them increases the precision of impact estimates and reduces sample…
Descriptors: Mathematics Instruction, Intervention, Pretests Posttests, Curriculum Design
