Table 4.

Comparison of the prediction and cross validation performance of the linear kernel function with the other kernel functions in the KPCA-LDA-XGB model.

Model	RP	RMSEP	RCV	RMSECV
KPCA(RBF)-LDA-XGB	0.805	0.112	0.744	0.128
KPCA(Poly)-LDA-XGB	0.814	0.108	0.753	0.126
KPCA(linear)-LDA-XGB	0.829	0.107	0.739	0.128