Table 1 Descriptive statistics and correlation analysis
Variable | Observation | Mean | SD | Min | Max |
|---|---|---|---|---|---|
Inter-city green innovation cooperation | 3288 | 4.18 | 10.69 | 0.00 | 177.00 |
Intra-city green innovation cooperation | 3288 | 6.86 | 52.15 | 0.00 | 1184.00 |
Population density | 3288 | 7.96 | 0.77 | 5.56 | 9.33 |
The level of economic development | 3288 | 10.55 | 0.63 | 9.03 | 11.96 |
Human capital | 3288 | 0.046 | 1.00 | − 2.61 | 2.28 |
Infrastructure | 3288 | 2.70 | 0.43 | 1.44 | 3.60 |
Government expenditure on science and technology | 3288 | − 4.52 | 0.88 | − 6.69 | − 2.31 |
Urban openness | 3288 | 0.19 | 0.36 | 0.00 | 8.13 |
Command-and-control environmental regulation intensity | 3288 | 0.05 | 0.00 | 0.00 | 0.022 |
Industrial structure upgrading | 3288 | 0.92 | 0.50 | 0.09 | 5.17 |
Digital financial coverage | 2740 | 166.06 | 67.27 | 1.88 | 326.49 |