Research Article
Age Discrimination of Chinese Baijiu Based on Midinfrared Spectroscopy and Chemometrics
Table 3
Classification results of spirit samples by discriminant analysis in different spectral pretreatment methods.
| | Preprocessing methods | Training set | Test set | | Accuracy (percentage %) | Samples of misclassified | Accuracy (percentage %) | Samples of misclassified |
| | Raw spectra | 93.33 | 4 | 95.00 | 1 | | 5-point smoothing | 93.33 | 4 | 95.00 | 1 | | 15-point smoothing | 93.33 | 4 | 95.00 | 1 | | Multivariate baseline correction | 90.00 | 6 | 90.00 | 2 | | First derivative | 83.38 | 10 | 75.00 | 5 | | Second derivative | 86.66 | 8 | 85.00 | 3 |
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