Table 2.
Analysis of variance (ANOVA) for the fitted quadratic polynomial models for optimization of extraction parameters
| Source | TPC (R2 = 0.8864) | TFC (R2 = 0.9549) | DPPH (R2 = 0.9927) | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| DFa | SSb | MSc | F-value | p-value | DF | SS | MS | F-value | p-value | DF | SS | MS | F-value | p-value | |
| Model | 5 | 1,350.87 | 270.17 | 18.72 | < 0.0001 | 6 | 767.43 | 127.90 | 38.87 | < 0.0001 | 4 | 518.70 | 129.68 | 440.37 | < 0.0001 |
| Lack of Fit | 9 | 166.12 | 18.46 | 7.88 | 0.0582 | 8 | 32.24 | 4.03 | 3.05 | 0.1942 | 10 | 3.17 | 0.32 | 1.46 | 0.4196 |
| Pure Error | 3 | 7.02 | 2.34 | 3 | 3.96 | 1.32 | 3 | 0.65 | 0.22 | ||||||
a Degree of freedom
b Sum of squares
c Mean square