Table 8 Box-Behnken experiment design and results.
From: Research on coal rock parameter calibration based on discrete element method
Test number | Encoding level | Relative error (%) | ||
|---|---|---|---|---|
A | B | C | ||
1 |  − 1 |  − 1 | 0 | 9.54 |
2 | 0 | 1 | 1 | 8.22 |
3 |  − 1 | 0 | 1 | 5.54 |
4 | 1 |  − 1 | 0 | 10.75 |
5 | 1 | 0 |  − 1 | 10.82 |
6 |  − 1 | 0 |  − 1 | 10.07 |
7 | 0 | 0 | 0 | 3.21 |
8 | 0 |  − 1 |  − 1 | 15.8 |
9 | 0 | 0 | 0 | 3.09 |
10 | 1 | 1 | 0 | 5.95 |
11 | 0 |  − 1 | 1 | 7.21 |
12 |  − 1 | 1 | 0 | 5.14 |
13 | 0 | 1 |  − 1 | 7.30 |
14 | 1 | 0 | 1 | 6.55 |
15 | 0 | 0 | 0 | 2.98 |
