| Parameter | Coefficients Value | Probability | Robust probability | (VIF) |
| Intercept | −26,000.95 | 0.08* × 10−4 | 0.17* × 10−4 |
|
| Household size | 1997.01 | 0.80* × 10−2 | 0.67* × 10−2 | 2.49 |
| Household Income | 20.02 | 0.38* × 10−2 | 0.53* × 10−2 | 1.24 |
| Household rooms | 5961.32 | 0.01* × 10−4 | 0.00* | 1.12 |
| Education level | −99.83 | 0.71 | 0.32 | 1.07 |
| Households | −3.91 | 0.21 | 0.08 | 1.99 |
| Meter connections | 148.23 | 0.66* × 10−4 | 0.17* × 10−4 | 1.55 |