| 变量 | Entry | Maintain | |||
|---|---|---|---|---|---|
| low-novelty (1) | high-novelty (2) | low-novelty (3) | high-novelty (4) | ||
| Migration | 0.0393***(0.0064) | 0.0227**(0.0093) | 0.0248**(0.0115) | 0.0004(0.0180) | |
| Density | 12.1587***(0.1432) | 11.1634***(0.1802) | 13.4935***(0.2239) | 13.8471***(0.3237) | |
| Migration×Density | -0.1901***(0.0196) | -0.1141***(0.0271) | -0.1543***(0.0308) | -0.0254(0.0467) | |
| Trade | -0.0201***(0.0060) | -0.0200**(0.0100) | -0.0483***(0.0104) | -0.0455**(0.0179) | |
| FDI | 0.0223(0.0164) | 0.0602**(0.0305) | -0.0595**(0.0282) | 0.0085(0.0540) | |
| Total_pat | 0.0515***(0.0051) | 0.1114***(0.0127) | 0.0798***(0.0094) | 0.1015***(0.0131) | |
| “国家—时段”控制 | YES | YES | YES | YES | |
| “技术—时段”控制 | YES | YES | YES | YES | |
| N | 10903 | 6491 | 4875 | 2567 | |
| R2 | 0.559 | 0.590 | 0.662 | 0.736 | |
