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Design and results of Plackett–Burman test.
| No | A | B | C | D | E | F | G | Angle of repose (°) |
|---|---|---|---|---|---|---|---|---|
| 1 | 1 | 1 | 1 | −1 | −1 | −1 | 1 | 46.9 |
| 2 | −1 | −1 | −1 | −1 | −1 | −1 | −1 | 35.2 |
| 3 | −1 | 1 | −1 | 1 | 1 | −1 | 1 | 42.5 |
| 4 | 1 | 1 | −1 | −1 | −1 | 1 | −1 | 38.3 |
| 5 | 1 | 1 | −1 | 1 | 1 | 1 | −1 | 37.5 |
| 6 | 1 | −1 | −1 | −1 | 1 | −1 | 1 | 40.4 |
| 7 | −1 | 1 | 1 | 1 | −1 | −1 | −1 | 41.8 |
| 8 | 1 | −1 | 1 | 1 | −1 | 1 | 1 | 43.5 |
| 9 | −1 | 1 | 1 | −1 | 1 | 1 | 1 | 46.4 |
| 10 | 1 | −1 | 1 | 1 | 1 | −1 | −1 | 38.3 |
| 11 | −1 | −1 | −1 | 1 | −1 | 1 | 1 | 41.7 |
| 12 | −1 | −1 | 1 | −1 | 1 | 1 | −1 | 38.6 |
