Estimation of the Thurstonian model for the 2-AC protocol

Christensen, Rune Haubo Bojesen; Lee, Hye Seong; Brockhoff, Per B.

doi:10.1016/j.foodqual.2011.10.005

Cited by 40 publications

(29 citation statements)

References 51 publications

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“…In consumer testing, repetition for each consumer is required to determine whether there are inter-consumer differences in sensory perception or preference (Christensen et al, 2012). Therefore, when designing an experiment, the number of repetitions needed for each consumer must be determined to reveal consumer segmentation information without distorting the consumer's perception.…”

Section: Discussionmentioning

confidence: 99%

“…For affective group I, which performed 8 repeated paired-preference tests, the individual responses on preference between the samples were analyzed in terms of d′ estimates using a cumulative link mixed model (Christensen et al, 2012). For this analysis, the preference responses were rearranged based on the sureness rating, i.e.…”

Section: Determination Of Affective Discriminators: Analyses Of the Imentioning

confidence: 99%

“…Therefore, in this paper, in order to measure both preference and sensory difference under an affective-based process, the repeated paired-preference test with a sureness rating was designed to be combined with the repeated duo-trio test for a new consumer discrimination methodology that can also provide insightful information on the diversity in consumer preferences. We wanted to analyze the consistency of individual preference responses and employ the preference results as a means of identifying affective discriminators by applying a new extension of Thurstonian model using the cumulative link mixed model (Christensen, Lee, & Brockhoff, 2012).…”

Section: Introductionmentioning

confidence: 99%

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Affective discrimination methodology: Determination and use of a consumer-relevant sensory difference for food quality maintenance

Kim

Sim

Lee

2015

Food Research International

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Section: Discussionmentioning

confidence: 99%

Section: Determination Of Affective Discriminators: Analyses Of the Imentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Affective discrimination methodology: Determination and use of a consumer-relevant sensory difference for food quality maintenance

Kim

Sim

Lee

2015

Food Research International

Self Cite

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“…The use of this fundamental measure allowed comparison between studies using different experimental protocols, for example with and without the “no preference” option (Alfaro‐Rodriguez and others ). Recently, there has been a renewed interest in the statistics associated with these computations (Ennis and Ennis , 2012b; Christensen and others , ; Jesionka and others ; Bi and others ).…”

Section: Introductionmentioning

confidence: 99%

Applying Disruptive Preference Test Protocols to Increase the Number of “No Preference” Responses in the Placebo Pair, Using Chinese Consumers

Xia

Zhong

O’Mahony

2016

Journal of Food Science

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One form of paired preference test protocol requires consumers to assess 2 pairs of products. One is the target pair under consideration, while the other is a putatively identical pair named the "placebo pair" which is also presented as a control. Counterintuitively, the majority of consumers report preferences when presented with the placebo pair. Their response frequencies are hypothesized to be those of consumers having "no preference" and are compared with the response frequencies elicited by a target pair, to determine whether the target pair elicits significant preferences. The primary goal of this paper was to study the robustness of 2 new so called disruptive protocols that reduced the proportion of consumers, who reported preferences when assessing a putatively identical pair of products. For this task, the tests were performed in a different language, in a different country, using different products from before. The results showed that the proportion of consumers reporting preferences for the placebo pair was reduced, confirming earlier work. Also, comparison of d' values showed a lack of significant overall differences between the placebo and target pairs, while chi-squared analyses indicated significant differences in the response frequencies. This indicated that the sample was segmented into 2 balanced groups with opposing preferences.

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“…And finally, building on recent statistical advances in Thurstonian theory (Christensen and Brockhoff ; Brockhoff and Christensen ; Christensen et al . , ), Ennis and Christensen () have connected tetrad testing to the general linear model and have shown that the tetrad test is consistently more precise than the triangle test at measuring sensory differences.…”

Section: Introductionmentioning

confidence: 99%

Importance of Correct Instructions in the Tetrad Test

Rousseau

Ennis

2013

Journal of Sensory Studies

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Use of the tetrad test has increased recently as both theoretical and experimental results have shown that it is statistically more powerful than the triangle test. In this article, although, we show that this power advantage depends on the choice of instructions. Specifically, we show that if experimenters ask respondents to select the two most similar samples out of four, instead of asking respondents to group the four samples into two groups of two based on similarity, then the resulting test will have approximately the same power as the triangle test. This fact serves as a reminder of the importance of correct test instructions in difference testing, as specific wording can clearly affect a test power and thus the final conclusion of an investigation. Practical Applications Businesses are increasingly considering the tetrad test as an alternative to the triangle test within their difference testing programs. This article clarifies the correct test instructions for the tetrad test, and shows that its power advantage over the triangle test will be compromised if incorrect instructions are given. Thus, it is essential that practitioners provide correct task instructions in order to realize the full potential of the tetrad test.

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Estimation of the Thurstonian model for the 2-AC protocol

Cited by 40 publications

References 51 publications

Affective discrimination methodology: Determination and use of a consumer-relevant sensory difference for food quality maintenance

Affective discrimination methodology: Determination and use of a consumer-relevant sensory difference for food quality maintenance

Applying Disruptive Preference Test Protocols to Increase the Number of “No Preference” Responses in the Placebo Pair, Using Chinese Consumers

Importance of Correct Instructions in the Tetrad Test

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