Reduced-Pressure Boiling Extraction of Oleuropein Coupled with Ultrasonication from Olive Leaves (Olea europaea L.)

Table 3

The variance analysis and significance test table of regression coefficient of response surface design.

Source of variation	Degree of freedom	Sum of squares	Mean squares	-test	value
	1	0.018	0.018	0.60	0.45
	1	0.0019	0.0019	0.062	0.81
	1	0.0048	0.0048	0.16	0.70
	1	0.34	0.34	11.16	0.004
	1	0.0020	0.0020	0.066	0.80
	1	0.0012	0.0012	0.040	0.84
	1	0.0002	0.0002	0.0074	0.93
	1	0.0036	0.0036	0.12	0.74
	1	0.0025	0.0025	0.082	0.78
	1	0.051	0.051	1.66	0.22
	1	0.026	0.026	0.85	0.37
	1	0.34	0.34	11.32	0.004
	1	0.52	0.52	17.21	0.001
	1	2.69	2.69	88.36	<0.000
Model	14	3.41	0.24	7.99	0.000
Residual	14	0.43	0.03
Lack of fit significant	10	0.40	5.72	0.053	0.0537
Pure error	4	0.028	0.0070
Corrected total	28	3.83

Significant at 0.01.