| 变量 | collaboration_rate | citation_rate | |||
|---|---|---|---|---|---|
| (1) | (2) | (3) | (4) | ||
| Migration | 0.0496**(0.0247) | 0.0609***(0.0112) | -0.0194(0.0150) | 0.0650***(0.0037) | |
| Trade | 0.4187***(0.0022) | 0.3609***(0.0007) | |||
| FDI | 0.0146(0.0098) | 0.0125***(0.0041) | |||
| Previous rate | -0.3602***(0.0079) | -0.2729***(0.0034) | |||
| “国家—时段”控制 | YES | YES | YES | YES | |
| “技术—时段”控制 | YES | YES | YES | YES | |
| N | 11707 | 11707 | 22695 | 22695 | |
| R2 | 0.005 | 0.792 | 0.003 | 0.938 | |
