Research Article
A Progressive Combined Variable Selection Method for Near-Infrared Spectral Analysis Based on Three-Step Hybrid Strategy
Table 4
Prediction results of starch content in corn by different variable selection methods.
| Variable selection methods | Number of variables | nLV | Rc2 | RMSEC (%) | Rp2 | RMSEP (%) |
| None | 700 | 8 | 0.941 | 19.89 | 0.882 | 28.05 | CARS | 25 | 6 | 0.980 ± 0.002 | 11.58 ± 0.52 | 0.971 ± 0.004 | 13.69 ± 0.97 | VCPA | 9 | 9 | 0.990 ± 0.001 | 8.04 ± 2.51 | 0.987 ± 0.002 | 9.28 ± 2.19 | IRIV | 16 | 6 | 0.964 ± 0.004 | 15.65 ± 1.68 | 0.920 ± 0.009 | 22.59 ± 1.97 | SiPLS | 182 | 8 | 0.991 ± 0.002 | 7.60 ± 1.63 | 0.976 ± 0.010 | 12.65 ± 1.89 | IVSO | 102 | 10 | 0.984 ± 0.002 | 10.26 ± 1.34 | 0.965 ± 0.006 | 14.92 ± 2.11 | BOSS | 13 | 9 | 0.991 ± 0.001 | 7.74 ± 0.85 | 0.990 ± 0.002 | 8.02 ± 1.09 | IVSO-BOSS | 31 | 8 | 0.987 ± 0.001 | 8.92 ± 0.49 | 0.974 ± 0.003 | 13.52 ± 0.67 | SiPLS-IVSO | 90 | 7 | 0.998 ± 0.001 | 4.05 ± 0.68 | 0.995 ± 0.001 | 5.55 ± 0.84 | SiPLS-BOSS | 27 | 6 | 0.999 ± 0.001 | 2.35 ± 0.57 | 0.997 ± 0.001 | 4.22 ± 0.52 | CARS-IVSO-BOSS | 8 | 5 | 0.812 ± 0.024 | 28.15 ± 3.54 | 0.0751 ± 0.054 | 34.02 ± 3.87 | SiPLS-VCPA-BOSS | 7 | 7 | 0.709 ± 0.042 | 9.31 ± 2.14 | 0.711 ± 0.032 | 9.81 ± 1.89 | SiPLS-IVSO-IRIV | 23 | 6 | 0.999 ± 0.001 | 2.52 ± 0.43 | 0.999 ± 0.002 | 3.01 ± 0.68 | SiPLS-IVSO-BOSS | 8 | 8 | 0.999 ± 0.001 | 2.40 ± 0.23 | 0.999 ± 0.001 | 2.80 ± 0.35 |
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