THE POWER OF SENSORY DISCRIMINATION METHODS USED IN REPLICATED DIFFERENCE AND PREFERENCE TESTS |
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| Authors: | JIAN BI DANIEL M. ENNIS |
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| Affiliation: | The Institute for Perception 7629 Hull St., Suite 200 Richmond, VA 23235;The Institute for Perception The University of Illinois and The Medical College of Virginia |
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| Abstract: | Research on the power of discrimination methods in difference and preference tests has both theoretical and practical significance. Power is important to evaluate the sensitivities of tests and determine sample size. Ennis and Bi (1998, 1999) proposed the beta-binomial distribution to model replicated difference and preference tests with inter-trial variation and analyzed in general the power of the tests. In this paper, the power of discrimination methods for replicated difference and preference tests is discussed further. The equations for calculating power for methods based on the BB model are given. Examples with tables and charts for calculating and comparing the power of the methods are also given. |
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