| Variables | VIF | 1/VIF |
| RD*area_rd | 1.30 | 0.7886 |
| RD | 1.27 | 0.7867 |
| size | 1.25 | 0.7995 |
| wage | 1.23 | 0.8123 |
| area_rd | 1.11 | 0.9045 |
| ownership | 1.07 | 0.9340 |
| subsidy | 1.07 | 0.9375 |
| edu | 1.05 | 0.9529 |
| Mean VIF | 1.17 |
|