Table 3. Analysis of variance for evaluation of the second-order model.
| Regression | Degrees of freedom | Type I sum of squares | r2 | F-value | p-value |
|---|---|---|---|---|---|
| Covariates | 5 | 0.42846 | 0.3054 | 7.94 | 0.0006 |
| Linear | 4 | 0.56331 | 0.4016 | 13.04 | <0.0001 |
| Quadratic | 4 | 0.20883 | 0.1489 | 4.84 | 0.0095 |
| Interactions | 6 | 0.02942 | 0.0210 | 0.45 | 0.8318 |
| Total model | 19 | 1.23002 | 0.8768 | 6.00 | 0.0004 |
| Residual | Degrees of freedom | Sum of squares | Mean square | F-value | p-value |
| Lack of fit | 10 | 0.15710 | 0.01571 | 6.02 | 0.0197 |
| Pure error | 6 | 0.01567 | 0.00261 | ||
| Total error | 16 | 0.17276 | 0.01080 |