| lpatent | lInvention | lstargepa |
dum_t | 0.153 | 0.505*** | −0.173 |
| (0.92) | (3.00) | (−0.92) |
dum_u | 0.222 | 0.244 | 0.128 |
| (1.19) | (1.29) | (0.60) |
dum_t#dum_u | −0.144 | −0.209 | 0.0120 |
| (−0.75) | (−1.07) | (0.05) |
L.log_Total | 0.594*** | 0.592*** | 0.534*** |
| (32.01) | (31.55) | (25.38) |
L.cap_exp | −0.842** | 0.0757 | −1.908*** |
| (−2.07) | (0.18) | (−4.13) |
L.Leverage | −0.000464 | −0.0000193 | −0.000992 |
| (−0.84) | (−0.03) | (−1.58) |
L.Borad_size | −0.0396*** | −0.00241 | −0.0607*** |
| (−3.48) | (−0.21) | (−4.71) |
L.logQ | 0.0818*** | 0.0943*** | 0.00285 |
| (4.85) | (5.53) | (0.15) |
_cons | −10.34*** | −11.98*** | −9.028*** |
| (−24.09) | (−27.59) | (−18.54) |
N | 3374 | 3374 | 3374 |
r2 | 0.247 | 0.258 | 0.176 |