A Study of the Ionic Liquid-Based Ultrasonic-Assisted Extraction of Isoliquiritigenin from Glycyrrhiza uralensis

Table 3

Test of significance for regression coefficient.

Source	Sum of squares	Df	Mean square	value	value
Model	0.22	9	0.025	37.95	<0.0001
A-[BMIM]Br	0.048	1	0.048	74.25	<0.0001
B-ultrasonic time	0.039	1	0.039	60.57	0.0001
C-solid-liquid ratio	0.026	1	0.026	40.87	0.0004
AB		1		6.53	0.0378
AC		1		0.97	0.3585
BC		1		0.039	0.8498
A^2		1		5.76	0.0475
B^2		1		7.86	0.0264
C^2	0.088	1	0.088	136.32	<0.0001
Residual		7
Lack of fit		3		0.63	0.6342
Pure error		4
Cor total	0.23	16