变量 | (1) | (2) | (3) | (4) | (5) | (6) | (7) | (8) |
N | Mean | Sd | Min | P25 | P50 | P75 | Max | |
Differ | 7986 | 0.439 | 0.237 | 0.127 | 0.278 | 0.377 | 0.540 | 1.523 |
Patent | 7986 | 2.540 | 1.218 | 0.000 | 1.792 | 2.565 | 3.367 | 6.603 |
Invent | 7986 | 1.765 | 1.162 | 0.000 | 0.693 | 1.792 | 2.565 | 5.979 |
Cite | 7986 | 3.087 | 1.664 | 0.000 | 1.946 | 3.091 | 4.248 | 7.854 |
PC | 7986 | 0.336 | 0.472 | 0.000 | 0.000 | 0.000 | 1.000 | 1.000 |
SOE | 7986 | 0.352 | 0.478 | 0.000 | 0.000 | 0.000 | 1.000 | 1.000 |
Board_size | 7986 | 8.718 | 1.642 | 5.000 | 8.000 | 9.000 | 9.000 | 15.000 |
Idpt | 7986 | 0.371 | 0.052 | 0.333 | 0.333 | 0.333 | 0.400 | 0.571 |
Size | 7986 | 22.008 | 1.160 | 20.034 | 21.188 | 21.823 | 22.625 | 26.099 |
Lev | 7986 | 0.408 | 0.200 | 0.054 | 0.247 | 0.396 | 0.558 | 0.870 |
ROA | 7986 | 0.047 | 0.053 | −0.132 | 0.016 | 0.042 | 0.074 | 0.210 |
ROE | 7986 | 0.075 | 0.096 | −0.353 | 0.032 | 0.072 | 0.121 | 0.338 |
Growth | 7986 | 0.181 | 0.324 | −0.414 | 0.001 | 0.129 | 0.287 | 1.767 |
Dual | 7986 | 0.261 | 0.439 | 0.000 | 0.000 | 0.000 | 1.000 | 1.000 |
FirmAge | 7986 | 2.696 | 0.349 | 1.609 | 2.485 | 2.773 | 2.944 | 3.332 |