Table 4.

ATR-IR PLS regression results for baicalin and total baicalein. The unit of SEC, SEP and SECV is %.

ATR-IR	Baicalin
	Cross validation					Test-set validation
	Factors	R2	SEC	SECV	RPD	Factors	R2	SEC	SEP	RPD
1st der	2	0.88	1.22	1.37	2.80	3	0.88	0.93	1.31	2.91
2nd der	4	0.90	0.85	1.22	3.14	4	0.88	0.85	1.35	2.84
MSC	4	0.85	1.20	1.49	2.57	4	0.80	1.01	1.74	2.20
SNV	4	0.85	1.19	1.49	2.56	4	0.81	1.01	1.69	2.27
2nd der+MSC	2	0.89	1.18	1.31	2.92	4	0.88	0.81	1.43	2.68
SNV+2nd der	3	0.88	1.03	1.37	2.79	3	0.86	0.92	1.46	2.62
2nd der+SNV	2	0.89	1.16	1.30	2.95	4	0.88	0.79	1.45	2.64
ATR-IR	Total baicalein
	Cross validation					Test-set validation
	Factors	R2	SEC	SECV	RPD	Factors	R2	SEC	SEP	RPD
1st der	2	0.88	1.05	1.19	2.77	2	0.85	0.89	1.28	2.57
2nd der	3	0.88	0.80	1.14	2.88	3	0.87	0.71	1.18	2.79
MSC	3	0.82	1.20	1.43	2.31	3	0.86	1.00	1.26	2.61
SNV	3	0.83	1.19	1.40	2.36	3	0.85	0.98	1.26	2.62
2nd der+MSC	2	0.89	1.00	1.13	2.92	3	0.89	0.86	1.04	3.18
SNV+2nd der	3	0.87	0.84	1.21	2.73	4	0.87	0.70	1.18	2.79
2nd der+SNV	2	0.89	0.99	1.12	2.94	3	0.89	0.81	1.02	3.24