Table 4.
The discriminant results of the sample sets using the optimal wavelengths selected by the other sample sets.
| Model | Sample/Wavelength | Methods | Parameters | Calibration Accuracy (%) | Prediction Accuracy (%) |
|---|---|---|---|---|---|
| PLS-DA | Set 1/OPW 2 a | PCA loadings | 4 | 77.94 | 77.27 |
| Second derivative | 11 | 98.53 | 90.91 | ||
| CARS | 14 | 98.53 | 81.82 | ||
| SPA | 5 | 85.29 | 81.82 | ||
| Set 1/OPW 3 b | PCA loadings | 4 | 75.00 | 77.27 | |
| Second derivative | 11 | 98.53 | 86.36 | ||
| CARS | 7 | 95.59 | 77.27 | ||
| SPA | 11 | 94.12 | 86.36 | ||
| Set 2/OPW 1 c | PCA loadings | 2 | 85.56 | 90.00 | |
| Second derivative | 4 | 88.89 | 90.00 | ||
| CARS | 3 | 84.44 | 90.00 | ||
| SPA | 3 | 82.22 | 90.00 | ||
| Set 2/OPW 3 | PCA loadings | 5 | 94.44 | 96.67 | |
| Second derivative | 5 | 92.22 | 96.67 | ||
| CARS | 2 | 82.22 | 80.00 | ||
| SPA | 7 | 98.89 | 96.67 | ||
| Set 3/OPW 1 | PCA loadings | 4 | 95.56 | 90.00 | |
| Second derivative | 4 | 92.22 | 86.67 | ||
| CARS | 11 | 98.89 | 100.00 | ||
| SPA | 9 | 100.00 | 96.67 | ||
| Set 3/OPW 2 | PCA loadings | 5 | 94.44 | 90.00 | |
| Second derivative | 5 | 100.00 | 96.67 | ||
| CARS | 11 | 100.00 | 100.00 | ||
| SPA | 3 | 94.44 | 86.67 | ||
| SVM | Set 1/OPW 2 a | PCA loadings | (1.7411, 84.4485) | 69.12 | 90.91 |
| Second derivative | (256, 147.0334) | 89.71 | 86.36 | ||
| CARS | (256, 48.5029) | 83.82 | 81.82 | ||
| SPA | (256, 147.0334) | 88.24 | 86.362 | ||
| Set 1/OPW 3 b | PCA loadings | (16, 84.4485) | 72.06 | 86.362 | |
| Second derivative | (256, 147.0334) | 89.71 | 81.82 | ||
| CARS | (256, 147.0334) | 80.88 | 68.18 | ||
| SPA | (256, 9.1896) | 79.41 | 81.82 | ||
| Set 2/OPW 1 c | PCA loadings | (256, 9.1896) | 90.00 | 93.33 | |
| Second derivative | (256, 84.4485) | 96.67 | 100.00 | ||
| CARS | (147.0334, 84.4485) | 93.33 | 90.00 | ||
| SPA | (48.5029, 147.0334) | 96.67 | 96.67 | ||
| Set 2/OPW 3 | PCA loadings | (147.0334, 256) | 96.67 | 100.00 | |
| Second derivative | (147.0334, 84.4485) | 96.67 | 96.67 | ||
| CARS | (256, 147.0334) | 92.22 | 96.67 | ||
| SPA | (27.8576, 147.0334) | 96.67 | 96.67 | ||
| Set 3/OPW 1 | PCA loadings | (9.1896, 147.0334) | 97.78 | 90.00 | |
| Second derivative | (147.0334, 27.8576) | 97.78 | 93.33 | ||
| CARS | (147.0334, 256) | 97.78 | 100.00 | ||
| SPA | (147.0334, 27.8576) | 100.00 | 100.00 | ||
| Set 3/OPW 2 | PCA loadings | (84.4885, 48.5029) | 98.89 | 100.00 | |
| Second derivative | (147.0334, 16) | 98.89 | 100.00 | ||
| CARS | (147.0334, 91.1111) | 91.11 | 86.67 | ||
| SPA | (256, 48.5029) | 98.89 | 96.67 |
a OPW 2 means the optimal wavelengths were selected by sample set 2; b OPW 3 means the optimal wavelengths were selected by sample set 3; c OPW 1 means the optimal wavelengths were selected by sample set 1.