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ASTM E 2262 : 2003

Superseded

Superseded

A superseded Standard is one, which is fully replaced by another Standard, which is a new edition of the same Standard.

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Standard Practice for Estimating Thurstonian Discriminal Distances

Available format(s)

Hardcopy , PDF

Superseded date

09-04-2019

Language(s)

English

Published date

10-07-2003

€104.99
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CONTAINED IN VOL. 15.08, 2015 Defines procedures to estimate Thurstonian discriminal distances (that is, d' values) from data obtained on two samples.

Committee
E 18
DocumentType
Standard Practice
Pages
47
ProductNote
Reconfirmed 2003
PublisherName
American Society for Testing and Materials
Status
Superseded
SupersededBy

1.1 This practice describes procedures to estimate Thurstonian discriminal distances (that is, d' values) from data obtained on two samples. Procedures are presented for four forced-choice methods (that is, the triangle, the duo-trio, the 3-alternative-forced-choice (or 3-AFC) and the 2-AFC (also called the directional difference test)), the A/Not-A method, the Same-Different method and for data obtained from ordered category scales. Procedures for estimating the variance of d' are also presented. Thus, confidence intervals and statistical tests can be calculated for d'.

1.2 The procedures in this document pertain only to the unidimensional, equal-variance model. Other, more complicated Thurstonian models, involving multiple dimensions and unequal variances exist but are not addressed in this standard. The procedure for forced-choice methods is limited to dichotomous responses. The procedure for the A/Not-A method assumes equal sample sizes for the two samples. The procedure for the Same-Different method assumes equal sample sizes for the matched and unmatched pairs of samples. For all methods, only unreplicated tests are considered. (Tests in which each assessor performs multiple (that is, replicated) evaluations require different analyses.)

1.3 Thurstonian scaling is a method for measuring the perceptual difference between two samples based on a probabilistic model for categorical choice decision making. The magnitude of the perceived difference, δ, can be estimated from the assessors' categorical choices using the methods described in this practice (See Appendix X3 for a more detailed description of Thurstonian scaling).

1.4 In theory, the Thurstonian does not depend on the method used to measure the difference between two samples. As such, δ provides a common scale of measure for comparing samples measured under a variety of test conditions. For example, Thurstonian scaling can be used to compare products measured under different test conditions, to compare panels (trained, consumer or both) that have evaluated the same samples (using the same or different test methods) and to compare test methods on their ability to discriminate samples that exhibit a fixed sensory difference.

1.5 This standard may involve hazardous materials, operations and equipment. This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.

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ASTM E 1810 : 2012 : REDLINE Standard Practice for Evaluating Effects of Contaminants on Odor and Taste of Exposed Fish
ASTM E 2049 : 2012 : REDLINE Standard Guide for Quantitative Attribute Evaluation of Fragrance/Odors for Shampoos and Hair Conditioners by Trained Assessors
ASTM E 2164 : 2016 : REDLINE Standard Test Method for Directional Difference Test
ASTM E 1627 : 2011 : REDLINE Standard Practice for Sensory Evaluation of Edible Oils and Fats
ASTM E 1879 : 2017 : REDLINE Standard Guide for Sensory Evaluation of Beverages Containing Alcohol
ASTM E 460 : 2012 : REDLINE Standard Practice for Determining Effect of Packaging on Food and Beverage Products During Storage
ASTM E 1593 : 2013 : REDLINE Standard Guide for Assessing the Efficacy of Air Care Products in Reducing the Perception of Indoor Malodor
ISO 5495:2005 Sensory analysis — Methodology — Paired comparison test

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