Table 5.
ANOVA of Response Surface Quadratic Model
| Source | Sum of squares | Df | Mean square |
F value |
P value Prob > F |
|---|---|---|---|---|---|
| Model | 1512 | 14 | 108 | 78.32 | < 0.0001 significant |
| A | 298.8 | 1 | 298.8 | 216.6 | < 0.0001 |
| B | 2.680 | 1 | 2.680 | 1.943 | 0.1836 |
| C | 306.6 | 1 | 306.2 | 222.3 | < 0.0001 |
| D | 219.3 | 1 | 219.3 | 159.0 | < 0.0001 |
| AB | 1.177 | 1 | 1.177 | 0.853 | 0.3702 |
| AC | 0.562 | 1 | 0.562 | 0.407 | 0.5327 |
| AD | 1.488 | 1 | 1.480 | 1.079 | 0.3154 |
| BC | 1.703 | 1 | 1.703 | 1.235 | 0.2840 |
| BD | 2.544 | 1 | 2.540 | 1.844 | 0.1945 |
| CD | 1.513 | 1 | 1.513 | 1.097 | 0.3154 |
| A2 | 554.4 | 1 | 554.4 | 401.9 | < 0.0001 |
| B2 | 183.4 | 1 | 183.4 | 133.0 | < 0.0001 |
| C2 | 3.645 | 1 | 3.646 | 2.643 | 0.1248 |
| D2 | 50.70 | 1 | 50.70 | 36.76 | < 0.0001 |
| Residual | 20.69 | 15 | 1.379 | – | – |
| Lack of fit | 13.06 | 10 | 1.306 | 0.855 | 0.617 not significant |
| Pure error | 7.63 | 5 | 1.526 | – | – |
| Cor total | 1533 | 29 | – | – | – |
Df Degree of freedom