3.4.14 Soil Cu prediction
For Cu, the MARS model had excellent prediction accuracy
(R2c=0.92; MBEc=-0.08;
RMSEc=1.39; RPDc=3.02; rank=1.00) for
calibration (Figure 4n). The accuracy of the prediction during
validation was found the highest and more or less similar for PLSR
(R2p=0.40; MBEp=-0.27;
RMSEp=3.12; RPDp=1.17) and RF
(R2p=0.39; MBEp=-0.09;
RMSEp=3.12; RPDp=1.17). The results are
concordant with those of Cozzolino & Moron (2003) and Chang et
al. (2001) for soil Cu with the mPLSR model.