Table 2.
Coefficients of determination R2, R2-adj, lack of fit (p-value of the regression) and analysis of variance (ANOVA) for the terms of the final model based on p-value and F-ratio.
| Coefficients of determination | Foam height (cm) | Antioxidant activity (%) |
|---|---|---|
| β0(constant) | 20.11 | 90.67 |
| β1(main effect) | −1.09 | −0.36 |
| P-value | 0.028 | 0.231 |
| β2(main effect) | −3.03 | 1.07 |
| P-value | 0.006 | 0.048 |
| β11(quadratic effect) | 0.02 | 0.02 |
| P-value | 0.048 | 0.699 |
| β22(quadratic effect) | 0.17 | −0.19 |
| P-value | 0.004 | 0.002 |
| β12(interaction effect) | 0.05 | 0.05 |
| P-value | 0.118 | 0.039 |
| R2 | 0.8125 | 0.9708 |
| p-value (lack of fit) | 0.196 | 0.135 |