Sensory Difference Testing: The Problem of Overdispersion and the Use of Beta Binomial Statistical Analysis
- Resource Type
- Article
Text
- Authors
- Lee, Hye-Seong; O'Mahony, Michael
- Source
- Food Science and Biotechnology, 08/30/2006, Vol. 15, Issue 4, p. 494-498
- Subject
- sensory evaluation
sensory difference tests
binomial statistics
overdispersion
beta binomial test
gamma
- Language
- English
- ISSN
- 1226-7708
An increase in variance (overdispersion) can occur when a binomial statistical analysis is applied to sensory difference test data in which replicate sensory evaluations (tastings) and multiple evaluators (judges) are combined to increase the sample size. Such a practice can cause extensive Type I errors, leading to serious misinterpretations of the data, especially when traditional simple binomial analysis is applied. Alternatively, the use of beta binomial analysis will circumvent the problem of overdispersion. This brief review discusses the uses and computation methodology of beta binomial analysis and in practice evidence for the occurrence of overdispersion.