Sensory difference tests: Overdispersion and warm-up

A comparison between nine laboratories performing triangle tests

“…They are in accordance with over-dispersion values reported in the literature (Angulo, Lee & O'Mahony, 2007;Liggett & Delwiche, 2005;Schlich et al, 2000), although values are not directly comparable because they were not computed in the same way.…”

Combining discrete choice and informed sensory testing in a two-stage process: Can it predict wine market share?

“…The standard also served us a warm up stimulus (Angulo, Lee, & O'Mahony, 2007). The reference standard wine was selected for presenting intermediate intensity in most of its sensory properties based on the trained sensory panel assessment.…”

Comparison of d′ estimates produced by three versions of a duo-trio test for discriminating tomato juices with varying salt concentrations: The effects of the number and position of the reference stimulus

“…To compare the performance of the three duo-trio protocols, the d 0 estimate for each protocol was computed from the pooled data over the three stimuli sets using the same method. Pooling data from replicate tests over subjects could violate the assumptions for a binomial test and introduce over-dispersion (Angulo, Lee, & O'Mahony, 2007;Lee & O'Mahony, 2006); therefore, the pooled data were analyzed for over-dispersion using a beta-binomial model (IFPrograms, Institute for Perception, Richmond, VA). The results revealed that there was no significant effect of over-dispersion in the present experiment.…”