Optimization of Flavonoid Extraction in Dendrobium officinale Leaves and Their Inhibitory Effects on Tyrosinase Activity

Table 6

ANOVA and R-squared for the selected factorial model.

Source	Sum of squares		Mean	F	p-value
		df	Square	Value	Prob>F
Model	142.41	5	28.48	23.24	0.0003	Significant
A- Methanol	10.85	1	10.85	8.85	0.0207
B- number	14.31	1	14.31	11.68	0.0112
AB	0.53	1	0.53	0.43	0.5321
A^2	84.08	1	84.08	68.59	<0.0001
B^2	47.07	1	47.07	38.40	0.0004
Residual	8.58	7	1.23
Lack of Fit	0.84	3	0.28	0.15	0.9275	Not Significant
Pure Error	7.74	4	1.93
Cor Total	150.99	12
Std. Dev.	1.11
Mean	31.52
C.V.%	3.51
PRESS	18.09
R-Squared	0.9432
Adj R-Squared	0.9026					a
Pred R-Squared	0.8802
Adeq Precisior	11.890