Table 4 Heterogeneity test based on geographical location.
(1) | (2) | (3) | (4) | |
|---|---|---|---|---|
Variables | Eastern region | Central region | Western region | Northeastern region |
\(\mathrm{ln}{envi}\) | 0.425*** (3.70) | 0.323 (1.26) | 0.246 (1.12) | 0.198 (0.73) |
\(\mathrm{ln}{fiscal}\) | 0.331 (1.19) | 0.279 (1.50) | 0.269 (1.02) | 0.245 (1.38) |
\(\mathrm{ln}{envi}* \mathrm{ln}{fiscal}\) | 1.089*** (3.22) | 0.781*** (2.66) | 0.310*** (2.71) | 0.165 (1.48) |
Control variable | YES | YES | YES | YES |
City effect | YES | YES | YES | YES |
Year effect | YES | YES | YES | YES |
Observations | 581 | 532 | 434 | 231 |
R-squared | 0.633 | 0.650 | 0.561 | 0.542 |
