Table 5. ANOVA results for the central composite design

Regression DF Type 1 sum of squares R-square F value Significant level
Linear 4 10.440892 0.2680 109.84 < 0.0001
Quadratic 4 18.879068 0.4846 198.61 < 0.0001
Crossproduct 6 7.995400 0.2052 56.07 < 0.0001
Total model 14 37.315360 0.9579 112.16 < 0.0001