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The use of quadratic models in two or more variables to describe a subjective response is discussed. Attention is given to the principles of experimental design as well as to any special problems incurred by the use of ranking or rating data as a response. An example taken from the textile area serves as an illustration.
sensory mechanisms, factor, response, experimental design, quadratic model, correlation, rating scale, ranking, paired comparisons
Statistician, E. I. du Pont de Nemours and Company, Wilmington, Del.