Table 3 Regression coefficient estimates for the quadratic polynomial model
Source | Degrees of freedom | Sum of squares | Mean square | F value | P value |
|---|---|---|---|---|---|
Model | 9 | 9.91 | 1.10 | 113.21 | < 0.0001 |
X1 | 1 | 0.078 | 0.078 | 8.02 | 0.0366 |
X 2 | 1 | 0.080 | 0.080 | 8.23 | 0.0351 |
X3 | 1 | 4.85 | 4.85 | 498.88 | < 0.0001 |
X12 | 1 | 0.32 | 0.32 | 32.76 | 0.0023 |
X1*X2 | 1 | 0.0081 | 0.0081 | 0.83 | 0.4033 |
X1*X3 | 1 | 0.0012 | 0.0012 | 0.13 | 0.7371 |
X22 | 1 | 2.08 | 2.08 | 214.28 | < 0.0001 |
X2*X3 | 1 | 0.0016 | 0.0016 | 0.16 | 0.7018 |
X32 | 1 | 3.05 | 3.05 | 313.54 | < 0.0001 |
Lack of fit | 3 | 0.005225 | 0.001742 | 0.08 | 0.9648 |