Performance of three affective methods and diagnosis of the ANOVA model

Citation
Ndm. Villanueva et al., Performance of three affective methods and diagnosis of the ANOVA model, FOOD QUAL P, 11(5), 2000, pp. 363-370
Citations number
27
Categorie Soggetti
Food Science/Nutrition
Journal title
FOOD QUALITY AND PREFERENCE
ISSN journal
09503293 → ACNP
Volume
11
Issue
5
Year of publication
2000
Pages
363 - 370
Database
ISI
SICI code
0950-3293(200009)11:5<363:POTAMA>2.0.ZU;2-I
Abstract
Consumer data arising from traditional scales frequently do not comply with ANOVA assumptions of normality, independence and homoscedasticity. Differe ntial expansiveness of scoring between assessors is also a limitation in th e use of scales. The self-adjusting scale was designed to minimize some of these problems but its performance with consumers has not been reported. Th is study compared the performance of the 9-point hedonic scale, the self-ad justing scale and the ranking test with respect to: differential expansiven ess between assessors, discriminating power and compliance of data with ANO VA assumptions. Candies were evaluated by 288 consumers. Data normality was checked by normal probability plots, Kolmogorov-Smirnov test and coefficie nts of skewness and kurtosis. Homoscedasticity assumptions were evaluated b y the Levene test and scatterplots. The self-adjusting scale was effective to deal with differential assessor expansiveness, produced homogeneous vari ances but its data showed gross deviations from normality. Hedonic scale da ta showed slight deviation from normality and lack of homoscedasticity. Ran k and self-adjusting scale showed the highest and the lowest discriminating power, respectively. (C) 2000 Elsevier Science Ltd. All rights reserved.