Table 8 Empirical results of heterogeneity check.
From: Research on digital infrastructure construction empowering new quality productivity
Variable | Heterogeneity of urban scale | Heterogeneity of urban hierarchy | Heterogeneity of urban regions | |||
|---|---|---|---|---|---|---|
Smaller cities | Larger cities | Key cities | Non-key cities | Eastern cities | Midwest cities | |
DI | 0.270*** (0.020) | 0.060 (0.067) | 0.371*** (0.108) | −0.120*** (0.033) | −0.058 (0.071) | 0.397*** (0.029) |
FDL | 0.001*** (0.000) | 0.004*** (0.001) | 0.028*** (0.005) | 0.001*** (0.000) | 0.004*** (0.002) | 0.001*** (0.000) |
ID | −0.000*** (0.000) | −0.002*** (0.000) | −0.001** (0.001) | −0.001*** (0.000) | −0.002*** (0.000) | −0.000*** (0.000) |
GI | 0.032*** (0.003) | 0.020 (0.013) | 0.240*** (0.071) | 0.036*** (0.005) | 0.052** (0.022) | 0.029*** (0.004) |
Constant | 0.027*** (0.001) | 0.099*** (0.003) | 0.111*** (0.016) | 0.050*** (0.001) | 0.099*** (0.005) | 0.038*** (0.001) |
Observations | 1380 | 1380 | 340 | 2420 | 990 | 1770 |
