|
| Non-state-owned business | State-owned business | ||||
|
| (1) | (2) | (3) | (4) | (5) | (6) |
| Variable | Green invention patents | Green utility model patents | Green general patents | Green invention patents | Green utility model patents | Green general patents |
| Low_carbon*time | 0.077*** | 0.081*** | 0.107*** | 0.095** | 0.114*** | 0.113** |
|
| (2.60) | (2.76) | (2.93) | (2.34) | (2.98) | (2.35) |
| cfo | 0.003*** | 0.001* | 0.003*** | 0.000 | −0.000 | −0.000 |
|
| (6.24) | (1.71) | (4.39) | (0.19) | (−0.61) | (−1.53) |
| Lev | 0.003*** | 0.003*** | 0.004*** | 0.056 | 0.052 | 0.061 |
|
| (3.64) | (3.66) | (4.12) | (1.43) | (1.40) | (1.37) |
| Tobin Q | −0.000 | 0.000 | 0.000 | −0.000 | −0.000 | −0.000 |
|
| (−0.18) | (0.57) | (0.51) | (−1.39) | (−1.15) | (−1.25) |
| Size | 0.194*** | 0.197*** | 0.263*** | 0.269*** | 0.244*** | 0.336*** |
|
| (16.57) | (16.54) | (18.33) | (21.81) | (21.01) | (23.55) |
| Age | −0.021 | −0.008 | −0.014 | −0.084*** | −0.092*** | −0.110*** |
|
| (−1.31) | (−0.52) | (−0.70) | (−3.27) | (−3.78) | (−3.70) |
| btm | −0.000 | −0.000 | −0.000** | 0.000** | 0.000 | 0.000* |
|
| (−1.38) | (−1.62) | (−1.99) | (2.14) | (1.58) | (1.77) |
| Netprofit | −0.002 | 0.002* | −0.000 | 0.000 | 0.000 | 0.000 |
|
| (−1.15) | (1.73) | (−0.24) | (1.13) | (1.07) | (0.86) |
| lnfirst | −0.106*** | −0.087*** | −0.126*** | −0.057* | −0.074** | −0.069* |
|
| (−4.25) | (−3.42) | (−4.08) | (−1.85) | (−2.55) | (−1.93) |
| Company | 控制 | 控制 | 控制 | 控制 | 控制 | 控制 |
| Year | 控制 | 控制 | 控制 | 控制 | 控制 | 控制 |