Table 3.
Performance parameters of the PLS models of the total flavones and l-borneol using different spectra pretreatment methods.
| Compounds | Pretreatments | Latent Factors | RMSEC | R2 | Rmsecv | R2 |
|---|---|---|---|---|---|---|
| Total flavones | Raw | 11 | 0.8258 | 0.9606 | 1.1334 | 0.9278 |
| SG(9) | 11 | 0.8341 | 0.9598 | 1.1349 | 0.9276 | |
| 1D + SG(9) | 7 | 0.8229 | 0.9609 | 1.1677 | 0.9234 | |
| 2D + SG(9) | 6 | 0.7269 | 0.9695 | 1.6578 | 0.8457 | |
| MSC | 9 | 1.1210 | 0.9274 | 1.4690 | 0.8788 | |
| SNV | 4 | 1.4127 | 0.8847 | 1.5961 | 0.8569 | |
| l-borneol | Raw | 13 | 0.1116 | 0.8056 | 0.1752 | 0.5342 |
| SG(9) | 13 | 0.1179 | 0.7829 | 0.1829 | 0.4919 | |
| 1D + SG(9) | 14 | 0.0315 | 0.9845 | 0.0917 | 0.8722 | |
| 2D + SG(9) | 6 | 0.0557 | 0.9515 | 0.1158 | 0.7966 | |
| MSC | 13 | 0.1071 | 0.8210 | 0.1814 | 0.5005 | |
| SNV | 13 | 0.1164 | 0.7886 | 0.1866 | 0.4712 |
Raw: raw spectra; MSC: multiplicative scatter correction; SNV: standard normal variate; SG: Savitzky–Golay filter; 1D: first derivative; 2D: second derivative.