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Table III
Solid wood – 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.
| NIR surface | Properties | N | Outliers | M | SD | Rank | SEC | SECV | r 2 |
|---|---|---|---|---|---|---|---|---|---|
| LR | Radial shrinkage | 293 | 10 | 3.1 | 0.68 | 4 | 0.35 | 0.39 | 0.74 |
| Tangential shrinkage | 293 | 10 | 5.5 | 1.24 | 4 | 0.52 | 0.59 | 0.83 | |
| Fibre saturation point | 293 | 14 | 20.3 | 1.68 | 4 | 0.65 | 0.74 | 0.85 | |
| TR | Radial shrinkage | 293 | 10 | 3.1 | 0.7 | 5 | 0.26 | 0.30 | 0.86 |
| Tangential shrinkage | 293 | 12 | 5.5 | 1.23 | 5 | 0.43 | 0.48 | 0.88 | |
| Fibre saturation point | 293 | 23 | 20.4 | 1.68 | 5 | 0.53 | 0.58 | 0.90 | |