Rapid Quality Assessment of Polygoni Multiflori Radix Based on Near-Infrared Spectroscopy

Table 3

Comparison of pretreatment with quantitative models.

Ingredients	Method	LVs	Calibration			Prediction
				RMSEC (%)	RMSECV (%)		RMSEP (%)	RPD
Moisture	2^nd Dev	6	0.66	0.42	1.25	0.60	0.99	1.1
	1^st Dev	7	0.82	0.24	0.91	0.72	0.65	1.7
	SNV	5	0.72	1.05	1.15	0.57	0.86	1.3
	SG	9	0.75	0.88	1.07	0.71	0.67	1.7
	None	8	0.74	0.93	1.08	0.71	0.68	1.7
Stilbene glycosides	2^nd Dev	2	0.49	0.68	0.78	0.21	0.83	0.9
	1^st Dev	4	0.52	0.32	0.77	0.28	0.81	1.0
	SNV	9	0.40	0.67	0.87	0.28	0.88	0.9
	SG	11	0.50	0.62	0.79	0.47	0.66	1.2
	None	9	0.44	0.67	0.83	0.38	0.72	1.1
Anthraquinone glycosides	2^nd Dev	8	0.53	0.42	0.79	0.44	0.58	1.0
	1^st Dev	6	0.58	0.54	0.69	0.54	0.75	0.8
	SNV	7	0.51	0.96	1.15	0.47	0.79	0.8
	SG	9	0.47	0.93	0.97	0.33	0.88	0.7
	None	9	0.48	0.94	1.09	0.31	1.00	0.6

The bold values in the table are the model parameter values under the optimal preprocessing approach, and are bolded to highlight them.