The fallacy of the null hypothesis in soft psychology |
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Authors: | Niels G Waller |
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Institution: | Department of Psychology and Human Development, Vanderbilt University, #512 Peabody, Nashville, TN 37203, USA |
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Abstract: | In his classic article on the fallacy of the null hypothesis in soft psychology J. Consult. Clin. Psychol. 46 (1978)], Paul Meehl claimed that, in nonexperimental settings, the probability of rejecting the null hypothesis of nil group differences in favor of a directional alternative was 0.50—a value that is an order of magnitude higher than the customary Type I error rate. In a series of real data simulations, using Minnesota Multiphasic Personality Inventory-Revised (MMPI-2) data collected from more than 80,000 individuals, I found strong support for Meehl’s claim. |
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Keywords: | Null hypothesis Soft psychology MMPI-2 |
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