Laffort parameters

In this example, the relation between 19 chemicals and 23 physicochemical parameters was examined ( ). PLS, unlike canonical correlation, permits use of more chemical parameters than stimuli. The twenty-three physicochemical variables included molecular weight, functional groups, Raman frequencies and Laffort parameters (see ( )) The Laffort parameters are alpha (an apolar factor proportional to molvolume), rho (a proton receptor factor), epsilon (an electron factor) and pi (a proton donor factor). 

Weights were also applied to stemdard scores for parameters developed by Laffort (c.f. and to achieve the regenerated space in Figure 10. Acetic, formic, and pentenoic acids were excluded in the calculations because data were incomplete for these stimuli. The weights utilized to achieve the space in Figure 10 are given in Table III. 

Figure 10. Two-dimensional space regenerated from weighting Lafforfs parameters shown in Table III in an attempt to reproduce the psychophysical space in Figure 8. Three acids, acidic, formic, and pentanoic, were not included because Laffort s parameters were not known for these stimuli (21),...

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See also in sourсe #XX -- [ ]

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