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Effect of varying the frequency threshold on the number of rules extracted
| Matrix | Frequency threshold (%) | Number of rules |
| Max minus 25% | 10 | 0 |
| Max minus 25% | 6 | 10 |
| Max minus 25% | 5 | 68 (Figure 5) |
| Max minus 25% | 2 | 4,084 |
| Mid-range-based | 10 | 1,746 |
| Mid-range-based | 6 | 36,550 |
| Mid-range-based | 5 | 111,143 |
| Mid-range-based | 2 | Intractable |
| 5% of HV | 10 | 0 |
| 5% of HV | 6 | 21 |
| 5% of HV | 5 | 301 |
| 5% of HV | 2 | 32,329 |
