Principal component analysis on the sensory and instrumental
data (Fig. 4) showed that the first and second principal components
explained, respectively, 48.5% and 25.9% of the observed variation
(74.4% in total). The significance level of Bartlett’s test of sphericity
was 0.000, which indicates that the correlation matrix is not an
identity matrix and that principal component analysis can be applied
to the data (Hair et al., 1998).