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THE POWER OF THE “ A” ‐“ NOT A” METHOD
Author(s) -
BI JIAN,
ENNIS DANIEL M.
Publication year - 2001
Publication title -
journal of sensory studies
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.61
H-Index - 53
eISSN - 1745-459X
pISSN - 0887-8250
DOI - 10.1111/j.1745-459x.2001.tb00306.x
Subject(s) - thurstone scale , two alternative forced choice , statistics , sample (material) , power (physics) , mathematics , sample size determination , variance (accounting) , statistical power , computer science , chemistry , physics , accounting , chromatography , quantum mechanics , business
The “ A” ‐ “ Not A” method is a rating method with two categories. It is often treated as a discrimination method. Unlike forced choice procedures, the Thurstonian model for this method involves a choice criterion. In statistical tests, it is treated as a comparison of two proportions. In this paper, the power for hypothesis tests involving the monadic and replicated monadic “ A” ‐ “ Not A” method is discussed. The power functions and the sample sizes needed for 80% power are given based on Thurstone's δ. Designs with equal and unequal allocations for A and A (Not A) samples are considered. The power of the method is also compared with that of four forced choice methods under the assumption that the perceptual variance is identical among methods. The comparison shows that, in general, the power for the five methods ranks from high to low: the 3‐AFC, 2‐AFC, “ A” ‐ “ Not A”, triangular and duo‐trio. The comparison also shows that, based on the same number of panelists and/or the same sample size for the A and A − samples for the methods, if the panelists are not too discrepant and the choice criterion in the “ A” ‐ “ Not A” method is not too strict or too lax, the power of the “ A” ‐ “ Not A” method is very close to that of the 2‐AFC method.

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