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Survival analysis statistics applied to threshold data obtained from the ascending forced-choice method of limits

Hough, G., Methven, L. and Lawless, H. T. (2013) Survival analysis statistics applied to threshold data obtained from the ascending forced-choice method of limits. Journal of Sensory Studies, 28 (5). pp. 414-421. ISSN 1745-459X

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To link to this item DOI: 10.1111/joss.12067

Abstract/Summary

Sensory thresholds are often collected through ascending forced-choice methods. Group thresholds are important for comparing stimuli or populations; yet, the method has two problems. An individual may correctly guess the correct answer at any concentration step and might detect correctly at low concentrations but become adapted or fatigued at higher concentrations. The survival analysis method deals with both issues. Individual sequences of incorrect and correct answers are adjusted, taking into account the group performance at each concentration. The technique reduces the chance probability where there are consecutive correct answers. Adjusted sequences are submitted to survival analysis to determine group thresholds. The technique was applied to an aroma threshold and a taste threshold study. It resulted in group thresholds similar to ASTM or logarithmic regression procedures. Significant differences in taste thresholds between younger and older adults were determined. The approach provides a more robust technique over previous estimation methods.

Item Type:Article
Refereed:Yes
Divisions:Faculty of Life Sciences > School of Chemistry, Food and Pharmacy > Department of Food and Nutritional Sciences > Food Research Group
ID Code:36734
Publisher:Wiley

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