Abstract
In order to investigate the structure of individual differences in sensory measurement of surface roughness, paired-comparisons data of judged roughness on metal surfaces were subjected to vector model analysis. Both of the derived most parsimonious configurations of test pieces for the data from tactual and visual experiments were two-dimensional and well-predicted by the physical variables of root mean square deviations in profile (Rrms) and mean spacing of profile irregularities (pitch). Individual differences were observed in the wide variety of weighted combinations of the two physical variables. The effects of training of inspectors on their structures of sensory measurement were clarified in the observed group differences. On the basis of these findings, some guidelines for instructing and training inspectors were discussed.
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