Updating the Debate on One- versus Two-Tailed Tests with the Directional Two-Tailed Test
| Autor: | Les Leventhal |
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| Rok vydání: | 1999 |
| Předmět: | |
| Zdroj: | Psychological Reports. 84:707-718 |
| ISSN: | 1558-691X 0033-2941 |
| DOI: | 10.2466/pr0.1999.84.3.707 |
| Popis: | For half a century, methodologists have debated when to use one-and two-tailed tests. But they conducted the debate with scarcely a mention of the little known directional two-tailed test—the only hypothesis test that, properly used, provides for a decision in either direction. In contrast, the traditional two-tailed test assesses nondirectional statistical hypotheses and does not provide for a directional decision. A directional two-tailed test with unequal rejection regions can have virtually the same power as a one-tailed test and, unlike one-tailed tests, it provides for deciding in the unpredicted direction. However, a problem unresolved for one-tailed tests remains for the directional two-tailed test, namely, whether one should create unequal rejection regions just because one has grounds to predict an outcome's direction. Nevertheless, the directional two-tailed test will satisfy research needs much more frequently than will traditional tests and should be adopted as the primary, general-purpose hypothesis test. |
| Databáze: | OpenAIRE |
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