Optimization of Extraction of Compound Flavonoids from Chinese Herbal Medicines Based on Quantification Theory and Evaluation of Their Antioxidant Activity

Table 4

Variance analysis of CFs yield.

Source of variance	Sum of deviation squares	Freedom	Mean square	F value	Critical value	Significance level
A	128.92	2	64.46	36.75	F0.01(2, 18) = 6.01
B	74.99	2	37.50	21.38
C	54.55	2	27.27	15.55	F0.05(2, 18) = 3.56
D	29.51	2	14.75	8.41
e (error)	31.57	18	1.75		F0.1(2, 18) = 2.62
Sum	319.54	26

Significant level . Significant level .