Table 2.
Parameters of the established PLS-R models for fat content. CV denotes cross-validated models, whereas TV refers to test set-validated regressions.
| Spectrometer | State of the Cheese | R2 (CV) | RMSECV/% | PC (CV) | R2 (TV) | RMSEP/% | Bias (TV) | PC (TV) | RPD |
|---|---|---|---|---|---|---|---|---|---|
| NIRFlex N-500 | Whole pieces | 0.9726 | 1.5711 | 2 | 0.9431 | 1.8964 | −0.3369 | 2 | 5.109 |
| Grated cheese | 0.9930 | 0.7845 | 2 | 0.9913 | 0.7676 | 0.3719 | 2 | 14.022 | |
| SCiO | Whole pieces | 0.9801 | 1.2466 | 2 | 0.9838 | 1.1874 | 0.1634 | 2 | 7.754 |
| Grated cheese | 0.9838 | 1.0527 | 2 | 0.9940 | 0.8194 | 0.1776 | 2 | 10.398 |
R2—Coefficient of determination; RMSECV—Root mean square error of cross validation; PC—Principle component; RMSEP—Root mean square error of prediction; RPD—Ratio of performance to deviation.