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The variance inflation factor of each variable.
| Variables | VIF | Tolerance |
|---|---|---|
| Enterprise age | 1.22 | 0.822 |
| Enterprise size | 1.53 | 0.652 |
| Enterprise profit | 1.29 | 0.772 |
| Regional development level | 1.03 | 0.973 |
| Labor union | 1.47 | 0.682 |
| Workers’ congress | 1.28 | 0.780 |
