Table 13 Variance analysis of the quadratic polynomial regression model of the relative error between the Box-Behnken experiment and the measured compressive strength.
From: Research on coal rock parameter calibration based on discrete element method
Source of variance | Quadratic sum | Freedom | Mean square | F-value | Significance level P |
|---|---|---|---|---|---|
Model | 997.5 | 14 | 71.25 | 67.57 |  < 0.0001 |
A | 16.66 | 1 | 16.66 | 15.80 | 0.0018 |
B | 309.58 | 1 | 309.58 | 293.59 |  < 0.0001 |
C | 487.69 | 1 | 487.69 | 462.51 |  < 0.0001 |
D | 166.88 | 1 | 166.88 | 158.26 |  < 0.0001 |
AB | 1.27 | 1 | 1.27 | 1.20 | 0.2948 |
AC | 0.0006 | 1 | 0.0006 | 0.0006 | 0.9810 |
AD | 0.2304 | 1 | 0.2304 | 0.2185 | 0.6486 |
BC | 6.15 | 1 | 6.15 | 5.83 | 0.0326 |
BD | 2.59 | 1 | 2.59 | 2.46 | 0.1429 |
CD | 1.13 | 1 | 1.13 | 1.08 | 0.3201 |
A2 | 0.0228 | 1 | 0.0228 | 0.0216 | 0.8855 |
B2 | 3.47 | 1 | 3.47 | 3.29 | 0.0447 |
C2 | 0.1917 | 1 | 0.1917 | 0.1818 | 0.6774 |
D2 | 0.9483 | 1 | 0.9483 | 0.8993 | 0.3617 |
residual error | 12.65 | 12 | 1.05 | Â | Â |
loss of fit term | 11.95 | 10 | 1.19 | 3.39 | 0.2492 |
pure error | 0.7049 | 2 | 0.3524 | Â | Â |
Sum | 1010.16 | 26 | Â | Â | Â |
R2 = 0.9875 R2Adj = 0.9729 C = 7.77% Adeq precision = 29.9309 | |||||
