城市环境立法能够提升企业出口国内附加值率吗?——基于双重差分模型（DID）的实证研究
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张兵兵, 胡榴榴
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Can urban environmental legislation improve the enterprises export domestic value added ratio? Empirical research based on difference-in-differences (DID) model
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ZHANG Bingbing, HU Liuliu
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表7 城市环境立法影响企业出口DVAR的异质性分析（II）
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Tab. 7 Heterogeneity analysis of the impact of urban environmental legislation on enterprise DVAR (II)
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| 被解释变量 | dvar | | 贸易类型 | | 两控区 | | （1） | （2） | （3） | （4） | （5） | （6） | | post×treat | 0.0019
(0.85) | -0.0123***
(-3.16) | | | -0.0107
(-0.99) | -0.0082***
(-3.85) | | | post×treat×pro | | | -0.0104***
(-4.30) | | | | | post×treat×control | | | | | | -0.0053**
(-2.56) | | _cons | 0.8723***
(10.93) | 0.8647***
(28.17) | 0.9803***
(16.94) | 0.7948***
(5.89) | 1.0413***
(38.61) | 0.9790***
(16.89) | | Control | YES | YES | YES | YES | YES | YES | | ai | YES | YES | YES | YES | YES | YES | | at | YES | YES | YES | YES | YES | YES | | aj | YES | YES | YES | YES | YES | YES | | ap | YES | YES | YES | YES | YES | YES | | N | 124337 | 57586 | 181923 | 42247 | 139676 | 181923 | | adj. R2 | 0.040 | 0.271 | 0.089 | 0.072 | 0.095 | 0.089 |
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