Table 1: PLS results for the prediction of chick hatching time for different pre-processing techniques based on 4-days incubated egg spectra.
Pre-processing method | PCs | rcal | RMSEC (hours) | rpred | RMSEP (hours) | Bias |
Normalized spectra | 7 | 0.876 | 2.76 | 0.882 | 3.62 | -0.861 |
SG smoothinga | 7 | 0.872 | 2.8 | 0.88 | 3.65 | -0.863 |
MSC | 4 | 0.852 | 3.04 | 0.856 | 3.49 | -0.769 |
Baseline offset correction | 7 | 0.878 | 2.79 | 0.885 | 3.6 | -0.825 |
SG first derivativea | 5 | 0.864 | 2.94 | 0.848 | 3.72 | -0.932 |
rcal and rpred are the correlation coefficient for calibration and prediction set, respectively; SG: Savitzky-Golay method; aNumber of segments: 5, Polynomial order: 2.