航空和高铁对中国城市创新能力的影响
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罗雪, 毛炜圣, 王帮娟, 刘承良
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The impacts of aviation and high-speed rail on urban innovation capacity in China
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LUO Xue, MAO Weisheng, WANG Bangjuan, LIU Chengliang
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表8 稳健性检验
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Tab.8 Robustness tests
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| 变量 | 模型25 | 模型26 | 模型27 | 模型28 | | Air | 0.0255** | 0.0488** | 0.0507** | 0.0515** | | (0.0089) | (0.0155) | (0.0166) | (0.0179) | | HSR | 0.0514*** | 0.2880*** | 0.2953 | 0.3265*** | | (0.0092) | (0.0584) | (0.0596) | (0.0666) | | 控制变量 | Yes | Yes | Yes | Yes | | 个体固定效应 | Yes | Yes | Yes | Yes | | 时间固定效应 | Yes | Yes | Yes | Yes | | R2 | 0.4146 | 0.6119 | 0.6096 | 0.0630 | | F(Air) | | 8248.09 | 1604.86 | 629.08 | | Air-IV | | 1.0452*** | 1.0964*** | 1.1504*** | | | (0.0090) | (0.0207) | (0.0333) | | F(HSR) | | 4039.81 | 763.76 | 412.60 | | HSR-IV | | 1.1843*** | 1.3294*** | 1.6310*** | | | (0.0116) | (0.0225) | （0.0520） | | LM统计量 | | 189.14 | 156.09 | 155.41 | | 样本量 | 2886 | 3178 | 2890 | 2602 |
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