Tag: Thurstonian Tools

Technical Report: Multiplicative versus Ratio Comparisons

ABSTRACT Claims such as “Our product whitens teeth twice as well as product X!” abound in advertising. Such claims have traditionally been viewed as statements regarding ratios of product performances and have been treated accordingly. In previous technical reports, we…

Technical Report: Indices of Sensory Difference: R-Index and d’

ABSTRACT Discrimination methodologies are used to investigate similarities and differences among variants of manufactured products. Applications typically involve cost savings, storage and product improvements. A researcher often requires more information than a simple test of significance which can be readily…

Technical Report: Relative Scales and Difference Testing Norms

ABSTRACT Appropriate treatment of “no difference” responses in paired preference and difference testing is a persistent issue in product testing. Different approaches involving their inclusion or omission from subsequent testing using the binomial distribution have been proposed. In 1980, paired…

Technical Report: From Ranks to Intensities

ABSTRACT In a classic voting problem, 24 people are asked to choose among three restaurants – one specializing in steak, one in Thai food, and one vegetarian. Nine vote for steak, eight for Thai and seven for vegetarian. The vegetarians…