TABLE 4.
Y | Calibration method | iPLS interval size | Selected Bands (nm) | LVs | RMSEC | RMSECV | R2 cal | R2 CV |
Ψpd | PLS | – | – | 1 | 0.07 | 0.08 | 0.65 | 0.61 |
iPLS | 10 | 590:704 | 3 | 0.06 | 0.08 | 0.76 | 0.61 | |
iPLS | 5 | 549:663 761:794 | 3 | 0.06 | 0.08 | 0.77 | 0.65 | |
Ψmd | PLS | – | – | 1 | 0.10 | 0.10 | 0.32 | 0.27 |
iPLS | 10 | 590:794 | 1 | 0.10 | 0.11 | 0.33 | 0.18 | |
iPLS | 5 | 802:835 | 2 | 0.09 | 0.10 | 0.38 | 0.22 | |
Yield | PLS | – | – | 3 | 1.25 | 1.46 | 0.42 | 0.21 |
iPLS | 10 | 508:704 | 2 | 1.34 | 1.44 | 0.32 | 0.23 | |
iPLS | 5 | 508:541 590:663 712:753 | 2 | 1.30 | 1.40 | 0.37 | 0.26 | |
Cwt | PLS | – | – | 3 | 0.06 | 0.07 | 0.39 | 0.24 |
iPLS | 10 | 508:704 | 2 | 0.06 | 0.06 | 0.35 | 0.27 | |
iPLS | 5 | 508:541 671:704 | 3 | 0.06 | 0.07 | 0.39 | 0.23 | |
Bwt | PLS | – | – | 3 | 0.28 | 0.32 | 0.53 | 0.38 |
iPLS | 10 | 590:704 | 2 | 0.28 | 0.30 | 0.53 | 0.46 | |
iPLS | 5 | 549:753 | 3 | 0.27 | 0.31 | 0.56 | 0.44 | |
TSS | PLS | – | – | 1 | 2.37 | 2.47 | 0.27 | 0.21 |
iPLS | 10 | 590:794 | 1 | 2.35 | 2.41 | 0.28 | 0.24 | |
iPLS | 5 | 549:582 671:794 | 1 | 2.35 | 2.41 | 0.28 | 0.24 | |
TA | PLS | – | – | 1 | 1.27 | 1.36 | 0.31 | 0.21 |
iPLS | 10 | 508:794 | 1 | 1.29 | 1.35 | 0.29 | 0.21 | |
iPLS | 5 | 508:541 802:835 | 1 | 1.27 | 1.32 | 0.31 | 0.25 | |
Malate | PLS | – | – | 1 | 0.78 | 0.85 | 0.57 | 0.51 |
iPLS | 10 | 508:704 | 2 | 0.73 | 0.83 | 0.64 | 0.53 | |
iPLS | 5 | 590:704 | 2 | 0.74 | 0.78 | 0.63 | 0.59 | |
Anth | PLS | – | – | 1 | 0.23 | 0.23 | 0.39 | 0.36 |
iPLS | 10 | 712:794 | 1 | 0.23 | 0.24 | 0.39 | 0.32 | |
iPLS | 5 | 549:582 712:753 | 1 | 0.23 | 0.23 | 0.38 | 0.36 | |
Phenols | PLS | – | – | 1 | 0.35 | 0.36 | 0.43 | 0.40 |
iPLS | 10 | 712:794 | 1 | 0.35 | 0.36 | 0.44 | 0.41 | |
iPLS | 5 | 16:20 26:30 | 3 | 0.33 | 0.36 | 0.50 | 0.41 | |
TLA | PLS | – | – | 1 | 0.55 | 0.56 | 0.07 | 0.04 |
iPLS | 10 | 590:704 | 2 | 0.52 | 0.55 | 0.16 | 0.06 | |
iPLS | 5 | 671:704 | 1 | 0.52 | 0.56 | 0.15 | 0.05 | |
LLA | PLS | – | – | 1 | 0.11 | 0.11 | 0.35 | 0.27 |
iPLS | 10 | 712:794 | 2 | 0.11 | 0.11 | 0.37 | 0.29 | |
iPLS | 5 | 712:753 | 1 | 0.11 | 0.11 | 0.35 | 0.31 | |
Pwt | PLS | – | – | 2 | 0.18 | 0.20 | 0.38 | 0.27 |
iPLS | 10 | 712:794 | 2 | 0.19 | 0.20 | 0.36 | 0.27 | |
iPLS | 5 | 761:794 | 2 | 0.19 | 0.20 | 0.35 | 0.25 |
Within each Y parameter the best calibration performance is reported in bold.