Table 2 Calibration results of exponential function model Eq.(1) for all cities. R2 = 0.515, sample size N = 147
From: Transport indicator analysis and comparison of 151 urban areas, based on open source data
| Calibration results | Coef | Std Err | t | P > |t| | [95.0% Conf. Int.] | |
|---|---|---|---|---|---|---|
| Log(a) | 3.7734 | 0.037 | 100.773 | 0.000 | 3.699 | 3.847 |
| b | −0.0101 | 0.001 | −12.232 | 0.000 | −0.012 | − 0.009 |