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Estimation of the Thurstonian model for the 2-AC protocol

Title
Estimation of the Thurstonian model for the 2-AC protocol
Authors
Bojesen Christensen R.H.Lee H.-S.Brockhoff P.B.
Ewha Authors
이혜성
SCOPUS Author ID
이혜성scopus
Issue Date
2012
Journal Title
Food Quality and Preference
ISSN
0950-3293JCR Link
Citation
vol. 24, no. 1, pp. 119 - 128
Indexed
SCI; SCIE; SCOPUS WOS scopus
Abstract
The 2-AC protocol is a 2-AFC protocol with a "no-difference" option and is technically identical to the paired preference test with a "no-preference" option. The Thurstonian model for the 2-AC protocol is parameterized by δ and a decision parameter τ, the estimates of which can be obtained by fairly simple well-known methods. In this paper we describe how standard errors of the parameters can be obtained and how exact power computations can be performed. We also show how the Thurstonian model for the 2-AC protocol is closely related to a statistical model known as a cumulative probit model. This relationship makes it possible to extract estimates and standard errors of δ and τ from general statistical software, and furthermore, it makes it possible to combine standard regression modelling with the Thurstonian model for the 2-AC protocol. A model for replicated 2-AC data is proposed using cumulative link mixed models. Examples will be given throughout the paper and the methodology is implemented in the authors' free R-packages sensR and ordinal. © 2011 Elsevier Ltd.
DOI
10.1016/j.foodqual.2011.10.005
Appears in Collections:
엘텍공과대학 > 식품공학전공 > Journal papers
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