Multiple regression and correlation (MRC) methods form a flexible family of statistical techniques that can address a wide variety of different types of research questions of interest to rehabilitation professionals. In this article, we review basic concepts and terms, with an emphasis on interpretation of findings relevant to research questions of interest to rehabilitation researchers. To assist readers in using MRC effectively, we review common analytical models (e.g., mediator and moderator tests) and recent thinking on topics such as interpretation of effect sizes and power analysis.
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