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Model verification results by using different spectral pretreatment methods.
| Number | Spectral pretreatment methods | PLS components | R 2 | RMSECV |
|---|---|---|---|---|
| 1 | Min-Max normalization method | 7 | 0.9944 | 0.00314 |
| 2 | Multiplicative scatter correction method | 6 | 0.9943 | 0.00319 |
| 3 | Vector normalization method | 6 | 0.9942 | 0.00320 |
| 4 | First derivative method | 8 | 0.9935 | 0.00339 |
| 5 | Subtraction of a straight line | 7 | 0.9939 | 0.00378 |
