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

Table 2.

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

Preprocessing methods	Inner Mongolia						Sichuan						Shanxi
	Number of variables	Optimal factor number	Calibration set		Prediction set		Number of variables	Optimal factor number	Calibration set		Prediction set		Number of variables	Optimal factor number	Calibration set		Prediction set
	Number of variables	Optimal factor number	R²c	RMSEC	R²p	RMSEP	Number of variables	Optimal factor number	R²c	RMSEC	R²p	RMSEP	Number of variables	Optimal factor number	R²c	RMSEC	R²p	RMSEP
RAW	26	9	0.9986	0.0173	0.9984	0.0182	35	10	0.9923	0.0406	0.9879	0.0480	39	9	0.9970	0.0251	0.9975	0.0234
SNV	35	8	0.9988	0.0160	0.9985	0.0174	37	8	0.9919	0.0399	0.9913	0.0424	39	7	0.9967	0.0254	0.9970	0.0263
MSC	29	6	0.9987	0.0166	0.9987	0.0167	35	8	0.9917	0.0404	0.9924	0.0400	39	7	0.9967	0.0256	0.9976	0.0240
MMN	32	7	0.9987	0.0168	0.9988	0.0152	35	10	0.9916	0.0408	0.9900	0.0438	35	8	0.9966	0.0260	0.9978	0.0227
SG	32	10	0.9986	0.0174	0.9775	0.0669	39	10	0.9921	0.0411	0.9903	0.0430	29	9	0.9968	0.0257	0.9975	0.0234
SG-1st	44	7	0.9984	0.0186	0.9633	0.0868	47	27	0.9908	0.0427	0.9805	0.0550	42	5	0.9965	0.0263	0.9924	0.0373
SNV-DT	41	7	0.9987	0.0163	0.9984	0.0175	55	8	0.9914	0.0412	0.9902	0.0432	51	8	0.9969	0.0249	0.9976	0.0235