Tünde Kuti and Adrienn Hegyi of Campden BRI Hungary state that, “Compared to the paired preference test, hedonic rating tests have the advantage that they can not only be used to measure the overall liking or disliking of the products to be compared they can also be used to measure the overall liking or disliking of specific attributes such e.g. For the manufacturer, this can mean that his test product might be successful only as a niche product for a certain sub-group of consumers. However, if some qualitative or quantitative differences in the sensory profile (aroma / texture / flavour) between products are revealed this strongly indicates that the tested consumer group is not homogenous, but segmented into two equal sub-groups with different preference patterns.
Only when the QDA does not reveal any significant differences in the sensory profile of products A and B can it be concluded that both products are comparable. Eliza Kostyra stressed, “such a result could also mean that samples A and B differ (in hedonic dimension) but there are two equal sub-groups of consumers with clearly different preference patterns for either product A or B, due to qualitative and quantitative differences between the products”.Ī quantitative descriptive analysis (QDA) can be performed as a next step to investigate this question further.
The most common interpretation of such results is “both samples are equally liked”. The test results are equally distributed between both samples: this suggests that there is no significant difference between the two products them.To get such information a quantitative descriptive analysis (QDA) would be the next recommended step to resolve this problem. Significantly more consumers prefer sample B (competitive product): in this case the manufacturer would want to know how the test product could be improved and to identify the relevant sensory attributes that need to be changed.Significantly more consumers prefer sample A (the test product): In this case the manufacturer may probably be satisfied with the results achieved by the test product and have no interest in further tests.In a paired preference test, three types of results are possible: Summarized individual results are compared with the statistical table for pair comparison (two-tailed test) to check statistical significance of the hedonic difference.” The pairs are presented randomly in AB or BA order, and the test person is asked to indicate which one of the pair she/he prefers. Each participant gets two coded samples, A (the test product) and B (the competitive sample). Such a test should be performed with a group size of about 80-100 consumers representing the target population. “When two samples are compared, the simpler of these two possibilities is the paired preference test. “However,” Kostyra stresses, “each method has its own special features.” by indirect comparison of the ratings that both products achieve independently from each other in a hedonic test which measures liking or acceptability.by direct pair comparison of the products in a paired preference test or.Eliza Kostyra, sensory analyst and head of the sensory laboratory at the Faculty of Human Nutrition and Consumer Sciences, WULS, Poland. "This comparative question can be explored in two ways", says Dr. the competitor's offer) occurs when a new product is developed for a market where similar products are already established, or when an existing product is to be reformulated or optimized, and has to be compared to its original version. The question as to whether consumers like a given product less, equally, or more than a similar product (e.g.
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