Table 9 Variance analysis of the quadratic polynomial regression model of the relative error between the Box-Behnken experiment and the measured accumulation angle.

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

172.32

9

19.15

170.94

 < 0.0001

A

1.79

1

1.79

15.95

0.0104

B

34.82

1

34.82

310.87

 < 0.0001

C

33.91

1

33.91

302.72

 < 0.0001

AB

0.04

1

0.04

0.3571

0.5761

AC

0.0169

1

0.0169

0.1509

0.7137

BC

22.61

1

22.61

201.86

 < 0.0001

A2

10.45

1

10.45

93.27

0.0002

B2

34.79

1

34.79

310.60

 < 0.0001

C2

44.45

1

44.45

396.83

 < 0.0001

Residual error

0.56

5

0.1120

  

Loss of fit term

0.5336

3

0.1779

13.44

0.07

Pure error

0.0265

2

0.0132

  

Sum

172.88

14

   

R2 = 0.9968 R2Adj = 0.9909 C = 4.48% Adeq precision = 47.799

  1. Note:P < 0.01 indicates a highly significant difference, while 0.01 < P < 0.05 indicates a significant difference.
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