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There has been an ongoing debate concerning the dubious value of null hypothesis statistical testing (NHST). The purpose of this article is to review the value of NHST and discuss its limitations and misuses. In doing so, we advocate that NHST is of nominal utility in outcomes research, and argue that rehabilitation researchers should focus on the calculation and interpretation of statistical power and effect size. During this era when outcomes are paramount, researchers in rehabilitation psychology cannot afford to conduct studies wherein significant methodological shortcomings compromise the validity of the results. Recommendations for the appropriate use and interpretation of statistical analysis in outcomes research are offered.