ANOVA of quadratic model for the extraction yields of ferulic acid.
| Source | Sum of squares | DF | Mean square | F value | p-Value |
|---|---|---|---|---|---|
| Model | 0.19 | 9 | 0.021 | 56.52 | < 0.0001 |
| A | 0.022 | 1 | 0.022 | 58.91 | 0.0001 |
| B | 0.12 | 1 | 0.12 | 320.74 | <0.0001 |
| C | 7.200 × 10−3 | 1 | 7.200 × 10−3 | 19.24 | 0.0032 |
| AB | 3.600 × 10−3 | 1 | 3.600 × 10−3 | 9.62 | 0.0173 |
| AC | 1.600 × 10−3 | 1 | 1.600 × 10−3 | 4.27 | 0.0775 |
| BC | 4.900 × 10−3 | 1 | 4.900 × 10−3 | 13.09 | 0.0085 |
| A2 | 4.642 × 10−4 | 1 | 4.642 × 10−3 | 1.24 | 0.3022 |
| B2 | 0.030 | 1 | 0.030 | 80.32 | <0.0001 |
| C2 | 3.800 × 10−4 | 1 | 3.800 × 10−3 | 1.02 | 0.3472 |
| Residual | 2.620 × 10−3 | 7 | 3.743 × 10−3 | ||
| Lack of fit | 1.700 × 10−3 | 3 | 5.667 × 10−3 | 2.46 | 0.2020 |
| Pure error | 9.200 × 10−4 | 4 | 2.300 × 10−3 | ||
| Cor total | 0.19 | 16 | |||
| Std. dev. | 0.019 | R 2 | 0.9864 | ||
| Mean | 2.23 | Adj R2 | 0.9690 | ||
| C.V. % | 0.87 | Pred R2 | 0.8516 | ||
| PRESS | 0.029 | Adeq precision | 25.104 |