Structuration of graphical scales in the sensory difference testing affects the distribution of results

Abstract

SummaryDifferences between the reference and the test samples were determined by the sensory analysis using two graphical scales: (1) unstructured one-way or two-way scales provided with verbal descriptions of the end points; (2) structured scales provided with 5 or 7 anchoring points with verbal descriptions. The anchoring points attracted the rating signs in the case of trained, and still more of untrained persons. Differences between the scales were found statistically significant by K~L M O G~R O V -SMIRNOV One-Sample or Two-Sample tests. Zusammenfassung Struklurierung graphischcr Skalen bei der scnsorischen Differcnzbewcrtung und ihr EinfluB auf die Verteilung der ErgebnisseUnterschiedc zwischen einem Referenzmuster uiid der untersuchten Probe wurdcn sensorisch mit Hilfc von zwei graphischen Skalen bewertet: I . Unstrukturierte Skalen, die in cine Richtung oder vom Mittelpunkt in zwei Richtungcn orientiert und tin den Endpunkten bcschrieben sind, 2. strukturierte Skalcn mit 5 oder 7 verbal definierten Stufen. Letztere wurden von erfahrcnen und noch mehr von uncrfahrenen Priifern bcvorzugt. Die Unterschiede zwischen den Ergebnisscn beider Skalen wurden mil der KoLMoGoRoFF-SMIRNOFF-Methode fur ein-oder zwei-Proben-Tests als statistisch signifikant ermittelt.

Sensory Acceptability of Foods with Added Lupin (Lupinus angustifolius) Kernel Fiber Using Pre‐set Criteria

“…Their basis of using the structured graphic scale, as opposed to an unstructured graphic scale (anchored at each end only), was that it may help reduce inter-subject differences in scale meaning comprehension (Holt and others 1992). Prevalence of non-normal distributions has been reported when using structured graphic scales (Ledahudec and others 1992), due in part to the clustering of responses around the anchor points (Ledahudec and Pokorny 1994). Non-normal distributions were found in some of the data in the present study.…”

Sensory Acceptability of Foods Containing Australian Sweet Lupin (Lupinus angustifolius) Flour

“…Structured graphic scales, as used in this study to rate acceptability, have been reported as valuable for reducing inter-subject differences in scale meaning comprehension (Holt and others 1992). Nevertheless, the effectiveness of structured graphic scales may be reduced by clustering of responses around the anchoring points (Ledahudec and Pokorny 1994), leading to the scales func-tioning more like 7-point categorical scales. In light of this, the data in the present study was recoded to the nearest anchor and the statistical analyses repeated to determine if conclusions were modified.…”