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  • ASTM E 2262 : 2003 : R2014

    Superseded A superseded Standard is one, which is fully replaced by another Standard, which is a new edition of the same Standard.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    Superseded date:  28-09-2020

    Language(s):  English

    Published date:  01-09-2014

    Publisher:  American Society for Testing and Materials

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    Abstract - (Show below) - (Hide below)

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

    Scope - (Show below) - (Hide below)

    1.1This 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'.

    1.2The 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.)

    1.3Thurstonian 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).

    1.4In theory, the Thurstonian δ 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.

    1.5This 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.

    General Product Information - (Show below) - (Hide below)

    Committee E 18
    Document Type Standard Practice
    Product Note Reconfirmed 2014
    Publisher American Society for Testing and Materials
    Status Superseded
    Superseded By
    Supersedes

    Standards Referenced By This Book - (Show below) - (Hide below)

    ASTM E 3009 : 2015 : EDT 1 Standard Test Method for Sensory Analysis—Tetrad Test
    ASTM E 2610 : 2018 Standard Test Method for Sensory Analysis—Duo-Trio Test
    ASTM E 1885 : 2018 Standard Test Method for Sensory Analysis—Triangle Test

    Standards Referencing This Book - (Show below) - (Hide below)

    ASTM E 1958 : 2006 Standard Guide for Sensory Claim Substantiation
    ASTM E 1879 : 1997 Standard Guide for Sensory Evaluation of Beverages Containing Alcohol
    ASTM E 1593 : 2006 Standard Guide for Assessing the Efficacy of Air Care Products in Reducing Sensorly Perceived Indoor Air Malodor Intensity
    ASTM E 1432 : 2019 Standard Practice for Defining and Calculating Individual and Group Sensory Thresholds from Forced-Choice Data Sets of Intermediate Size
    ASTM E 1958 : 2007 Standard Guide for Sensory Claim Substantiation
    ASTM E 1810 : 2012 : REDLINE Standard Practice for Evaluating Effects of Contaminants on Odor and Taste of Exposed Fish
    ASTM E 1958 : 2012 Standard Guide for Sensory Claim Substantiation
    ASTM E 1432 : 1991 : R1997 Standard Practice for Defining and Calculating Individual and Group Sensory Thresholds from Forced-Choice Data Sets of Intermediate Size
    ASTM E 1958 : 2016 Standard Guide for Sensory Claim Substantiation
    ASTM E 1958 : 2016 : REV A Standard Guide for Sensory Claim Substantiation
    ASTM E 2049 : 2012 : REDLINE Standard Guide for Quantitative Attribute Evaluation of Fragrance/Odors for Shampoos and Hair Conditioners by Trained Assessors
    ASTM E 1593 : 2013 Standard Guide for Assessing the Efficacy of Air Care Products in Reducing the Perception of Indoor Malodor
    ASTM E 2164 : 2016 : REDLINE Standard Test Method for Directional Difference Test
    ASTM E 1885 : 2018 Standard Test Method for Sensory Analysis—Triangle Test
    ASTM E 1432 : 2004 Standard Practice for Defining and Calculating Individual and Group Sensory Thresholds from Forced-Choice Data Sets of Intermediate Size
    ASTM E 2164 : 2016 Standard Test Method for Directional Difference Test
    ASTM E 1810 : 1996 Standard Practice for Evaluating Effects of Contaminants on Odor and Taste of Exposed Fish
    ASTM E 1958 : 2019 : REV A Standard Guide for Sensory Claim Substantiation
    ASTM E 1810 : 2012 Standard Practice for Evaluating Effects of Contaminants on Odor and Taste of Exposed Fish
    ASTM E 2164 : 2001 Standard Test Method for Directional Difference Test
    ASTM E 1697 : 2005 Standard Test Method for Unipolar Magnitude Estimation of Sensory Attributes
    ASTM E 1958 : 2019 Standard Guide for Sensory Claim Substantiation
    ASTM E 1885 : 2004 Standard Test Method for Sensory Analysis—Triangle Test
    ASTM E 1627 : 1994 : R1998 Standard Practice for Sensory Evaluation of Edible Oils and Fats
    ASTM E 2049 : 2006 Standard Guide for Quantitative Attribute Evaluation of Fragrance/Odors for Shampoos and Hair Conditioners by Trained Assessors
    ASTM E 1958 : 2007 : EDT 1 Standard Guide for Sensory Claim Substantiation
    ASTM E 1627 : 2011 : REDLINE Standard Practice for Sensory Evaluation of Edible Oils and Fats
    ASTM E 1885 : 2004 : R2011 Standard Test Method for Sensory AnalysisTriangle Test
    ASTM E 2049 : 1999 Standard Guide for Quantitative Evaluation of Fragrance/Odors for Shampoos and Hair Conditioners
    ASTM E 1879 : 2017 : REDLINE Standard Guide for Sensory Evaluation of Beverages Containing Alcohol
    ASTM E 1885 : 1997 : R2003 Standard Test Method for Sensory Analysis—Triangle Test
    ASTM E 1627 : 1994 : R2004 Standard Practice for Sensory Evaluation of Edible Oils and Fats
    ASTM E 1958 : 2018 Standard Guide for Sensory Claim Substantiation
    ASTM E 1879 : 2017 Standard Guide for Sensory Evaluation of Beverages Containing Alcohol
    ASTM E 1697 : 2005 : R2020 Standard Test Method for Unipolar Magnitude Estimation of Sensory Attributes
    ASTM E 1627 : 2011 Standard Practice for Sensory Evaluation of Edible Oils and Fats
    ASTM E 1697 : 1995 : R1999 Standard Test Method for Unipolar Magnitude Estimation of Sensory Attributes
    ASTM E 1879 : 2000 : R2004 : EDT 1 Standard Guide for Sensory Evaluation of Beverages Containing Alcohol
    ASTM E 2049 : 2012 Standard Guide for Quantitative Attribute Evaluation of Fragrance/Odors for Shampoos and Hair Conditioners by Trained Assessors
    ASTM E 1879 : 2000 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 1958 : 2020 Standard Guide for Sensory Claim Substantiation
    ASTM E 1958 : 1998 Standard Guide for Sensory Claim Substantiation
    ASTM E 1432 : 2004 : R2011 Standard Practice for Defining and Calculating Individual and Group Sensory Thresholds from Forced-Choice Data Sets of
    Intermediate Size
    ASTM E 1593 : 2013 : REDLINE Standard Guide for Assessing the Efficacy of Air Care Products in Reducing the Perception of Indoor Malodor
    ASTM E 1879 : 2020 Standard Guide for Sensory Evaluation of Beverages Containing Alcohol
    ASTM E 1593 : 1994 : R1999 Standard Practice for Assessing the Efficacy of Air Freshener Products in Reducing Sensorily Perceived Indoor Air Malodor Intensity
    ISO 5495:2005 Sensory analysis Methodology Paired comparison test
    ASTM E 2164 : 2008 Standard Test Method for Directional Difference Test
    ASTM E 1627 : 2019 Standard Practice for Sensory Evaluation of Edible Oils and Fats
    ASTM E 1885 : 1997 Standard Test Method for Sensory Analysis-Triangle Test
    ASTM E 1697 : 2005 : R2012 : EDT 1 Standard Test Method for Unipolar Magnitude Estimation of Sensory Attributes
    ASTM E 2164 : 2001 : R2007 Standard Test Method for Directional Difference Test
    ASTM E 1879 : 2000 : R2010 Standard Guide for Sensory Evaluation of Beverages Containing Alcohol
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