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Direct linkLeflot, Geertje; van Lier, Pol A. C.; Onghena, Patrick; Colpin, Hilde – Journal of School Psychology, 2013
The role of children's on-task behavior in the prevention of aggressive behavior was assessed among 570 Dutch speaking children followed from second- to third-grade elementary school in Flanders, Belgium. A first objective was to investigate whether individual level variation of on-task behavior moderated the impact of a universal preventive…
Descriptors: Grade 2, Grade 3, Prevention, Program Effectiveness
Jiang, Depeng; Pepler, Debra; Yao, Hongxing – International Journal of Behavioral Development, 2010
Do interventions work and for whom? For this article, we examined the influence of population heterogeneity on power in designing and evaluating interventions. On the basis of Monte Carlo simulations in Study 1, we demonstrated that the power to detect the overall intervention effect is lower for a mixture of two subpopulations than for a…
Descriptors: Intervention, Evaluation, Heterogeneous Grouping, Monte Carlo Methods
