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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