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ALTERNATIVE ANALYSES OF MAGNITUDE ESTIMATION DATA
Author(s) -
BUTLER G.,
POSTE L.M.,
WOLYNETZ M.S.,
AGAR V.E.,
LARMOND E.
Publication year - 1987
Publication title -
journal of sensory studies
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.61
H-Index - 53
eISSN - 1745-459X
pISSN - 0887-8250
DOI - 10.1111/j.1745-459x.1987.tb00420.x
Subject(s) - normalization (sociology) , statistics , mathematics , logarithm , power function , data set , calibration , computer science , mathematical analysis , sociology , anthropology
. Three methods of standardizing magnitude estimation data, external calibration, modulus normalization, and equalization were examined using a sensory evaluation data set arising from an incomplete block experiment testing five gels of varying firmness. Both the original data and a logarithmic transformation of the data were analyzed. Instrumental data were also collected. When untransformed data were analyzed the method of standardization profoundly affected tests of significance, coefficients of variation (%CV), and estimation of the power function relating the sensory data to the concentration of the underlying gel. The logarithmically transformed data lead to results independent of the standardizing technique and with higher F‐ratios, lower %CV's and normally distributed errors.