农业集聚对农业面源污染的影响——基于中国地级市面板数据门槛效应分析
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邓晴晴, 李二玲, 任世鑫
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Impact of agricultural agglomeration on agricultural non-point source pollution: Evidences from the threshold effect based on the panel data of prefecture-level cities in China
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DENG Qingqing, LI Erling, REN Shixin
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表4 门槛模型结果(lnCOD作为被解释变量)
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Tab. 4 Estimation results of threshold model (Dependent variable: lnCOD)
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变量 | ① THR | ② OLS | ③ RE | ④ FEI | ⑤ FER | ⑥ 2SLS | ⑦ RT | lnagg (lnagg≤0.976) | 0.474*** (30.83) | 0.718*** (31.47) | 0.496*** (32.97) | 0.474*** (30.83) | 0.474*** (9.61) | 0.781*** (20.98) | 0.135*** (8.37) | lnagg (lnagg>0.976) | 0.416*** (30.03) | 0.610*** (26.76) | 0.438*** (32.26) | 0.416*** (30.03) | 0.416*** (8.00) | 0.687*** (19.32) | lnagdp | 0.358*** (24.72) | 0.179*** (10.20) | 0.340*** (24.89) | 0.358*** (24.72) | 0.358*** (7.20) | 0.143*** (4.86) | 0.386*** (22.71) | lnps | -0.032 (-1.30) | -0.244*** (-8.97) | -0.020 (-0.81) | -0.032 (-1.30) | -0.032 (-0.74) | -0.290*** (-6.46) | -0.023 (-0.78) | lnas | 0.319*** (14.20) | 0.577*** (24.46) | 0.384*** (17.76) | 0.319*** (14.20) | 0.319*** (6.94) | 0.526*** (17.30) | 0.423*** (16.20) | lner | 0.031*** (7.21) | 0.097*** (13.96) | 0.043*** (9.92) | 0.031*** (7.21) | 0.031*** (3.76) | 0.088*** (8.27) | 0.019*** (3.25) | lnpc | 0.265*** (4.74) | 0.229*** (4.81) | 0.169*** (3.51) | 0.265*** (4.74) | 0.265** (2.55) | 0.172*** (2.94) | 0.473*** (7.23) | lnea | -0.016* (-1.88) | -0.243*** (-17.59) | -0.029*** (-3.34) | -0.016* (-1.88) | -0.016 (-1.58) | -0.220*** (-6.97) | -0.007 (-0.72) | _cons | 7.231*** (42.93) | 8.490*** (47.30) | 7.179*** (45.51) | 7.231*** (42.93) | 7.231*** (20.83) | 8.946*** (28.87) | 6.719*** (34.08) | F-test | 138.10 [0.000] | | | 138.10 [0.000] | | | 132.70 [0.000] | LM-test | | | 9654.92 [0.000] | | | | | Hausman test | | | 3699.42 [0.000] | | | | Wald test | | | | 89862.7 [0.000] | | | | Overidentification test | | | | | | 0.397 [0.8200] | | Weak instruments test(F statistic) | | | | | | 3065/1633[0.000] | | R-sq | 0.471 | 0.827 | 0.751 | 0.471 | 0.471 | 0.831 | 0.269 | Observation | 3033 | 3033 | 3033 | 3033 | 3033 | 2359 | 3033 |
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