| Industries | Proportion of beta unstable (length of time: 12 months) | |
| Significant level 5% | Significant level 10% | |
| Manufacturing | 18.57% | 27.14% |
| Real estate | 24.40% | 35.60% |
| Wholesale and retail | 23.33% | 32.00% |
| Utilities | 12.80% | 16.00% |
| Transportation | 9.47% | 15.79% |
| total | 17.21% | 24.71% |