The 9-point hedonic scale, also known as degree-of-liking scale, is the most common hedonic scale for measuring product liking by consumers.
Differently coded samples are presented to consumer panelists one at a time and they are asked to rate their hedonic response on the scale that can be in a vertical or horizontal line without affecting results.
The hedonic scale is based on equal interval, which is important in the assignment of numerical values to the response choices (from 1 = “dislike extremely” to 9 = “like extremely”) and to the use of parametric statistics in analysis of the data.
Peryam, D.R., & Girardot, N.F. (1952). Advanced taste-test method. Food Engineering, 24, 58-61, 194.
Peryam, D.R., & Pilgrim, F.J. (1957). Hedonic scale method of measuring food preferences. Food Technology, 11(9), 9–14.