Free Access

Table V

Powder samples – PLS results of the calibration and cross-validation on detrend, SNV (standard normal variate) and derivate 2 preprocessing spectral data. N: number of sample. M: mean. SD: standard deviation. SEC: standard error of calibration. SECV: standard error of cross validation.

Properties N Outliers M SD Rank SEC SECV r 2
Radial shrinkage 79 2 3.16 0.66 3 0.35 0.42 0.71
Tangential shrinkage 79 2 5.47 1.27 2 0.61 0.73 0.77
Fibre saturation point 79 3 20.35 1.67 3 0.62 0.78 0.87