Polysaccharides of Scrophularia ningpoensis Hemsl.: Extraction, Antioxidant, and Anti-Inflammatory Evaluation

Table 5

Analysis of variance (ANOVA) of the quadratic model and lack-of-fit.

Source	Sum of squares	Df	Mean square	F-value	Value	Significance
Model	13.22	9	1.47	16.13	0.00007	<0.0001
X1	0.041	1	0.041	0.45	0.5256	—
X2	1.51	1	1.51	16.53	0.0048	<0.01
X3	0.60	1	0.60	6.64	0.0366	<0.05
X1X2	0.15	1	0.15	1.67	0.2372	—
X1X3	0.59	1	0.59	6.43	0.0389	<0.05
X2X3	0.024	1	0.024	0.26	0.6233	—
X1^2	2.81	1	2.81	30.83	0.0009	<0.0001
X2^2	1.38	1	1.38	15.10	0.0060	<0.01
X3^2	5.13	1	5.13	56.36	0.0001	<0.0001
Residual	0.64	7	0.091	—	—	—
Lack-of-fit	0.40	3	0.13	2.26	0.224	—
Pure error	0.24	4	0.059	—	—	—
Cor total	13.86	16	—	—	—	—
R^2	0.954	—	—	—	—	—
Adj. R^2	0.895	—	—	—	—	—
Adeq. Precision	11.447	—	—	—	—	—

C.V.% = 2.47, significant at 0.05 level; significant at 0.01 level; significant at 0.001 level.