0107, 2019

Does the τ estimate from same-different test data represent a relevant sensory effect size for determining sensory equivalency?

John Castura/ July 1, 2019/ Peer-reviewed Paper/ 0 comments

Analysis of data arising from the same-different test method can be submitted to Thurstonian-derived modelling with the goal of estimating the sensory distance between two products (the discriminal distance δ) and the response bias for responding “same” (τ). Previously it has been proposed that it is possible to use τ estimates from same-different test data to represent the consumer-relevant effect

1506, 2018

Historical Developments in the ASTM Guide for Sensory Claim Substantiation

John Castura/ June 15, 2018/ Invited, Symposium/ 0 comments

The manner in which “no preference” responses have been treated in the E1958 Standard Guide for Sensory Claim Substantiation has evolved between 1998 and the current (2016) guide. For example, the 1998 guide proposes that an interviewer present consumers with a forced-choice preference question, and accept a “no preference” response from consumers who indicate that they do not have a

2008, 2017

Equivalence bounds for sensory applications based on consumer product evaluation

Sara King/ August 20, 2017/ Oral Presentation, Poster/ 0 comments

Equivalence testing is widely used in sensory science during all stages of product development and production. It is important to understand product differences and variations, some differences will go undetected by the consumer or will be considered “close enough” and therefore acceptable to the consumer.

0910, 2012

Equivalence tests and non-inferiority tests for sensory applications

Sara King/ October 9, 2012/ Oral Presentation/ 0 comments

Should the proposed ingredient substitution proceed? How did the product perform in a meet-or-beat study? These questions can be answered using Equivalence Tests and Non-inferiority Tests, respectively. Equivalence and non-inferiority tests are related. Each test makes use of bounds that are set based on practical considerations, and allows for decision-making within the framework of statistical hypothesis testing. This seminar will

2507, 2010

Best practices in sensory equivalence testing

Sara King/ July 25, 2010/ Oral Presentation/ 0 comments

Sensory professionals seeking guidance in best practices often turn to publications from standards organizations such as ISO and ASTM. A review of guides related to sensory equivalence testing will be presented. In several cases the power approach is prescribed for determining equivalency, but this approach is problematic. It attempts to control beta risk in the difference test and declare samples

2204, 2010

Similarity testing & equivalence testing

Sara King/ April 22, 2010/ Oral Presentation/ 0 comments

This abstract is unavailable. Please contact us for additional information. Castura, J.C. (2010). Similarity testing & equivalence testing. In ASTM E-18.04 Seminar on Discrimination Methods. April 22. St. Louis, MO, USA.

2104, 2010

Equivalence testing: A brief review

Sara King/ April 21, 2010/ Peer-reviewed Paper/ 0 comments

Equivalence testing has applications that include ingredient substitution and product matching. Statistical methods for determining equivalency were the subject of some interest in this journal prior to the Sensometrics 2008 conference (Bi, 2005; Meyners, 2007; Bi, 2007; Ennis, 2008a; Bi, 2008; Meyners, 2008; Ennis 2008b). A mini-symposium on equivalency at Sensometrics 2008 provided an opportunity for collegial discussion.