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Dong, Nianbo – American Journal of Evaluation, 2015
Researchers have become increasingly interested in programs' main and interaction effects of two variables (A and B, e.g., two treatment variables or one treatment variable and one moderator) on outcomes. A challenge for estimating main and interaction effects is to eliminate selection bias across A-by-B groups. I introduce Rubin's causal model to…
Descriptors: Probability, Statistical Analysis, Research Design, Causal Models
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Denny, Joanna Hope; Hallam, Rena; Homer, Karen – Early Education and Development, 2012
Research Findings: A statewide study of preschool classroom quality was conducted using 3 distinct classroom observation measures in order to inform a statewide quality rating system. Findings suggested that Tennessee preschool classrooms were approaching "good" quality on the Early Childhood Environment Rating Scale-Revised (ECERS-R)…
Descriptors: Learner Engagement, Rating Scales, Scoring, Teacher Characteristics