Table 4 Fcalculated, Ftheoretical, p values, coefficients of determination R2 and adjusted coefficient of determination R2a related to the three tested models
Model with main terms only | Model with main and interaction terms | Model with main, interaction and quadratic terms | |
|---|---|---|---|
Fcalculated | 15.65*** | 7.26** | 29.42*** |
Ftheoritical | 3.05 | 3.13 | 4.63 |
p value | 0 | 0.0032 | 0.0007 |
R2 (%) | 80.67 | 88.97 | 98.8 |
R2a (%) | 75.51 | 76.72 | 95.44 |