There is frequent interest in establishing whether two products or treatments are essentially equivalent or at parity. Two types of parity hypotheses are defined in this article, an unsurpassed hypothesis and an equality hypothesis. Tables for these two types of parity hypotheses are presented for 2-alternative forced choice and preference data. These two hypotheses are often used in product testing for claims support involving either equality or unsurpassed claims. The basis for the tables is presented along with illustrative examples of their use in product testing.
Ennis, D. (2008). Tables for parity testing. Journal of Sensory Studies, 23(1), 80 –91.
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Tables for parity testing
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