Journal Article: Precision of measurement in Tetrad testing (2014)

Abstract:
Interest in the Tetrad test has increased recently as it has become apparent that this methodology can be a more powerful alternative to the Triangle test within the standard difference testing paradigm. But when products are tested following an ingredient or process change, a pressing question is whether a sensory difference is large enough to be meaningful. To this end, in this paper we examine the precision of measurement offered by the Tetrad test as compared to two other standard forced-choice discrimination testing procedures – the Triangle and 2-AFC tests. This comparison is made from a Thurstonian perspective. In particular, for all three methods we compare: (1) The variances in the maximum-likelihood estimates of the Thurstonian measure of sensory difference, (2) The expected widths of the corresponding likelihood-based confidence intervals, and (3) The power of the tests when used for equivalence testing. We find that the Tetrad test is consistently more precise than the Triangle test and is sometimes even more precise than the 2-AFC. As a result of this precision, we discover that the Tetrad test is typically more powerful than the Triangle test for equivalence testing purposes and can, under certain conditions, even be more powerful than the 2-AFC.

This article appears as:
Ennis, J.M. and Christensen, R. H. B. (2014). Precision of measurement in Tetrad testing. Food Quality and Preference. 32, 98-106.

Colleagues can request this journal article here:
Precision of measurement in Tetrad testing

Not a Colleague? Click here to join for free.

site search



Upcoming Webinar

March 16, 2017
2PM EDT

Preference without a Significant Sensory Difference? A Solution

__________________

Announcing the release of the 2016 Webinar Series Package!

Offered at a discounted rate of 50% off regular price, this package contains recordings of all four webinars offered during the 2016 Quarterly Webinar Series.

Create Your Own Webinar Package

__________________

Webinar calendar

Membership

Become a Colleague!

Join now to gain access to our technical reports, presentations, and more!

Click here to login or join.

Latest Technical Report

Societies