Statistics for the calibration models developed for alcohol
strength and titratable acidity in apple wines using FT-NIR spectra
are shown in Table 2. Outliers in the calibration set were identified
and excluded based on extreme leverages (Lillhonga & Geladi,
2005). The lowest RMSECV and the highest R2c
in the calibration
set were obtained for alcohol strength (4.63 mL/L and 0.923) with
removal of 5 outliers, and titratable acidity (0.264 mg/L and 0.930)
with removal of 6 outliers. Generally, values of R2 greater than 0.9
indicate excellent quantitative information for calibration model
(Shenk &Westerhaus,1996). To improve the stability of the models,
the rank must be appropriately chosen to avoid overfit during
calibration. Fig. 4 shows the correlation between RMSECV and Rank
in calibration by PLS regression with leave-one-out validation,
Statistics for the calibration models developed for alcoholstrength and titratable acidity in apple wines using FT-NIR spectraare shown in Table 2. Outliers in the calibration set were identifiedand excluded based on extreme leverages (Lillhonga & Geladi,2005). The lowest RMSECV and the highest R2cin the calibrationset were obtained for alcohol strength (4.63 mL/L and 0.923) withremoval of 5 outliers, and titratable acidity (0.264 mg/L and 0.930)with removal of 6 outliers. Generally, values of R2 greater than 0.9indicate excellent quantitative information for calibration model(Shenk &Westerhaus,1996). To improve the stability of the models,the rank must be appropriately chosen to avoid overfit duringcalibration. Fig. 4 shows the correlation between RMSECV and Rankin calibration by PLS regression with leave-one-out validation,
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