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Table IV

Solid wood – PLS Model results of test validation. N: number of sample. M: mean. SD: standard deviation. SEP: standard error of prediction. RPD: ratio performance to deviation.

NIR surface Properties N Outliers M SD SEP r 2 RPD
LR Radial shrinkage 100 1 3.21 0.65 0.37 0.67 1.8
Tangential shrinkage 100 3 5.68 1.27 0.60 0.78 2.1
Fibre saturation point 100 0 20.48 1.95 0.84 0.84 2.3

TR Radial shrinkage 100 3 3.21 0.65 0.36 0.72 1.8
Tangential shrinkage 100 4 5.64 1.27 0.52 0.83 2.4
Fibre saturation point 100 5 20.58 1.91 0.68 0.87 2.8