. 2023 Aug 22;7:100573. doi: 10.1016/j.crfs.2023.100573

Table 1.

Prediction results of PLSR models under different preprocessing of Tartary buckwheat from Inner Mongolia, Sichuan and Shanxi.

Preprocessing methods	Number of variables	Inner Mongolia					Sichuan					Shanxi
		Optimal factor number	Calibration set		Prediction set		Optimal factor number	Calibration set		Prediction set		Optimal factor number	Calibration set		Prediction set
		Optimal factor number	R²c	RMSEC	R²p	RMSEP	Optimal factor number	R²c	RMSEC	R²p	RMSEP	Optimal factor number	R²c	RMSEC	R²p	RMSEP
RAW	256	13	0.9987	0.0163	0.9984	0.0183	13	0.9932	0.0382	0.9910	0.0407	11	0.9972	0.0244	0.9977	0.0223
SNV	256	11	0.9989	0.0154	0.9986	0.0170	11	0.9922	0.0393	0.9902	0.0448	9	0.9967	0.0255	0.9973	0.0251
MSC	256	10	0.9988	0.0160	0.9986	0.0168	11	0.9922	0.0393	0.9901	0.0449	9	0.9967	0.0255	0.9973	0.0250
MMN	256	11	0.9988	0.0160	0.9987	0.0158	13	0.9926	0.0385	0.9918	0.0403	10	0.9967	0.0257	0.9980	0.0219
SG	256	13	0.9987	0.0169	0.9982	0.0192	12	0.9922	0.0409	0.9907	0.0420	11	0.9969	0.0255	0.9977	0.0224
SG-1st	256	13	0.9988	0.0163	0.9991	0.0140	14	0.9934	0.0363	0.9851	0.0487	8	0.9967	0.0252	0.9937	0.0332
SG-2nd	256	212	0.9992	0.0127	0.9974	0.0236	156	0.9954	0.0299	0.9759	0.0606	73	0.9984	0.0180	0.9966	0.0267
SNV-DT	256	10	0.9988	0.0158	0.9986	0.0168	11	0.9922	0.0392	0.9874	0.0489	9	0.9967	0.0254	0.9975	0.0241