Source of variation Sum of squares (SS) Degree of freedom (d.f.) Mean squares (MS) F-value Probe > F Regression 129.2127 9 14.35696 20.62065 0.000026 Residual 6.9624 10 0.69624     Total 136.1751 19       R²= 0.94887155; Adjusted R²= 0.90285595

Table 4: ANOVA for the entire quadratic model