highly significantp < 0.01
The linear term D, and the quadratic terms A 2 , B 2 , C 2 , and D 2 , showed highly significant effects ( p < 0.01).
The linear term D, and the quadratic terms A 2 , B 2 , C 2 , and D 2 , showed highly significant effects ( p < 0.01).
The F -value (10.09) and p -value (<0.0001) of the regression model indicated that the fitting model was extremely significant.