Abstract: The treatment of no preference votes continues to be an issue in sensory science, especially as the proper treatment of these votes has recently gained importance in advertising claims support. There are currently three main methods in common use: dropping the no preference votes, splitting the votes equally and splitting the votes proportionally...
Abstract: Count-based comparisons such as “7 out of 10” or “2 to 1” are often used to quantify superior product performance. Because of experimental variability, statistics are needed to ensure confidence in such comparisons. Even so, count-based comparisons commonly appear without any statistical treatment of the data. In this article, we discuss statistics to...
Abstract: This study tested the principle of supercombinatorality, i.e. that food combinations (of more than two items) that are fully compatible on a pairwise basis are more compatible than combinations that are not fully compatible pairwise. Previous work has shown this to hold for salad ingredient combinations predicted for individuals, but this has not...
Abstract: Internal preference mapping (IPM) and Landscape Segmentation Analysis (LSA) are two techniques broadly used to unfold consumers’ overall product liking ratings and create spatial maps that will provide further insights on consumers’ preferences. IPM is based on a vector model while LSA involves an ideal point model. Through a simulation and the analysis...
Abstract: The analysis of choice data in which no difference/preference responses, or ties, occur is considered in this paper. A key issue addressed in the paper is the need for ‘‘identicality norms’’ for difference and preference tests. These norms reflect the researcher’s expectation for the number of ties that would have occurred in the...
Abstract: Although Total Unduplicated Reach and Frequency (TURF) analysis has repeatedly demonstrated value in a variety of market research applications, TURF analyses on large problem sizes have historically either been unacceptably slow or approximate in their solutions. To resolve this dilemma, we begin by identifying and explaining the principle of non-synergy that is present...
Abstract: “The power of sensory discrimination methods” (PSDM) was published in this journal in 1993.PSDM clarified the need for power considerations in the interpretation of testing results while providing a series of sample size tables. Despite the fact that the data considered in PSDM were binomially distributed, a normal approximation was used that both...
Abstract: Tools from the mathematical field of graph theory potentially allow the consumer scientist to efficiently analyze large numbers of combinations of food items, such as components on a salad. In this study, we tested the validity of such an approach.We began by asking subjects whether or not pairs of ingredientswould be appropriate to...
Abstract: Statements that are inherently multiplicative have historically been justified using ratios of random variables. Although recent work on ratios has extended the classical theory to produce confidence bounds conditioned on a positive denominator, this current article offers a novel perspective that eliminates the need for such a condition. Although seemingly trivial, this new...
Abstract: Berger and Hsu (1996a), whom Bi cites as a source for the IUT principle and the TOST, were sufficiently dissatisfied with the TOST as a test of bioequivalence that they developed their own alternative in the same paper. The idea for the TOST did not come from IUT principles, it came from the...