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In the regression-discontinuity (RD) design, scores on a pretreatment measure (assignment variable) determine assignment to groups such that respondents above a certain score are assigned to one group, whereas respondents below the score are assigned to another group (e.g., candidates for...
Homogeneity of within-subgroup error (residual) variance is a necessary statistical assumption for the appropriate use of moderated multiple regression (MMR) for assessing the effects of categorical moderator variables (e.g., ethnicity, gender). We provide a conceptual review of the homogeneity...
Balance in research methods is well recognized for improving knowledge in the field. Despite this, a review of published studies suggests that behavioral simulation has been severely underused. With this in mind, simulations are discussed as a potent and timely methodology for addressing...
Previous research has suggested that there exists a bias in the social sciences against no-effect hypotheses. This is regrettable given the importance of establishing not only when an effect does occur but also the boundary conditions of that effect. The purposes of this article are two-fold The...
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