Research Article
Rapid and Green Methods for Qualitative Classification of Polygonati Rhizoma and Polygonati Odorati Rhizoma Using a Handheld near Infrared Instrument
Table 2
The results of the PLS-DA with different spectral preprocessing methods.
| | Methods | Variety | Sensitivity | Specificity | Error rate (%) | | Cal. | CV | Test | Cal. | CV | Test | Cal. | CV | Test |
| | None | PR | 0.983 | 0.983 | 0.966 | 1.000 | 1.000 | 0.974 | 0.862 | 0.862 | 3.006 | | POR | 1.000 | 1.000 | 0.974 | 0.983 | 0.983 | 0.966 | 0.862 | 0.862 | 3.006 |
| | SNV | PR | 1.000 | 0.983 | 1.000 | 1.000 | 0.994 | 1.000 | 0.000 | 1.183 | 0.000 | | POR | 1.000 | 0.994 | 1.000 | 1.000 | 0.983 | 1.000 | 0.000 | 1.183 | 0.000 |
| | SG | PR | 0.983 | 0.983 | 0.966 | 0.994 | 0.944 | 0.987 | 1.183 | 1.183 | 2.365 | | POR | 0.994 | 0.994 | 0.987 | 0.983 | 0.983 | 0.966 | 1.183 | 1.183 | 2.365 |
| | SNV + SG | PR | 0.983 | 0.983 | 1.000 | 1.000 | 0.994 | 0.987 | 0.862 | 1.183 | 0.641 | | POR | 1.000 | 0.994 | 0.987 | 0.983 | 0.983 | 1.000 | 0.862 | 1.183 | 0.641 |
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Cal: calibration; CV: cross-validation; SNV: standard normal variable transformation; SG: Savitzky–Golay filter; SNV: best parameter.
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