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
邓晴晴, 李二玲, 任世鑫

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
DENG Qingqing, LI Erling, REN Shixin
表5 门槛模型结果（lnTN作为被解释变量）
Tab. 5 Estimation results of threshold model (Dependent variable: lnTN)
变量 ① THR ② OLS ③ RE ④ FEI ⑤ FER ⑥ 2SLS ⑦ RT
lnagg
(lnagg≤-0.320)		 0.423***
(26.17)		 0.788***
(32.66)		 0.442***
(27.94)		 0.422***
(26.14)		 0.422***
(7.12)		 0.843***
(24.58)		 0.095***
(7.31)
lnagg
(lnagg>-0.320)		 0.314***
(24.22)		 0.358***
(15.63)		 0.318***
(25.15)		 0.315***
(24.29)		 0.315***
(10.54)		 0.423***
(12.82)
lnagdp 0.290***
(25.36)		 0.118***
(7.35)		 0.278***
(25.63)		 0.290***
(25.36)		 0.290***
(7.49)		 0.083***
(3.48)		 0.315***
(23.08)
lnps 0.003
(0.17)		 -0.155***
(-6.18)		 0.009
(0.47)		 0.004
(0.18)		 0.004
(0.13)		 -0.187***
(-5.08)		 0.009
(0.36)
lnas 0.040**
(2.23)		 0.175***
(8.08)		 0.068***
(3.96)		 0.040**
(2.23)		 0.040
(0.98)		 0.129***
(4.53)		 0.130***
(6.19)
lner 0.007**
(2.16)		 0.039***
(6.13)		 0.013***
(3.77)		 0.007**
(2.17)		 0.007
(1.40)		 0.033***
(3.92)		 0.002
(0.52)
lnpc 1.043***
(23.55)		 1.070***
(24.38)		 0.967***
(24.78)		 1.043***
(23.54)		 1.043***
(9.23)		 1.010***
(18.20)		 1.206***
(22.95)
lnea -0.017**
(-2.53)		 -0.115***
(-8.94)		 -0.021***
(-3.04)		 -0.017**
(-2.54)		 -0.017**
(-2.01)		 -0.104***
(-5.01)		 -0.009
(-1.17)
_cons 6.909***
(51.71)		 8.075***
(48.98)		 6.943***
(54.89)		 6.909***
(51.70)		 6.909***
(26.13)		 8.493***
(32.55)		 6.467***
(40.87)
F-test 188.58
[0.000]		 188.56
[0.000]		 180.22
[0.000]
LM-test 10437.30
[0.000]
Hausman test 411.84
[0.000]
Wald test 170000
[0.000]
Overidentification test 1.922
[0.382]
Weak instruments
test(F statistic)		 1818/1871[0.000]
R-sq 0.534 0.837 0.794 0.534 0.534 0.839 0.339
Observation 3033 3033 3033 3033 3033 2359 3033