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6 门槛模型结果(lnTP作为被解释变量)
Tab. 6 Estimation results of threshold model (Dependent variable: lnTP)
变量 ① THR ② OLS ③ RE ④ FEI ⑤ FER ⑥ 2SLS ⑦ RT
lnagg
(lnagg≤0.452)
0.456***
(29.92)
0.639***
(28.47)
0.457***
(30.60)
0.456***
(29.92)
0.456***
(6.41)
0.661***
(18.26)
0.120***
(8.58)
lnagg
(lnagg>0.452)
0.380***
(30.20)
0.467***
(21.84)
0.385***
(31.27)
0.380***
(30.20)
0.380***
(10.46)
0.502***
(15.54)
lnagdp 0.407***
(33.56)
0.201***
(12.88)
0.382***
(33.35)
0.407***
(33.56)
0.407***
(7.90)
0.179***
(7.26)
0.435***
(29.52)
lnps 0.006
(0.27)
-0.201***
(-8.25)
0.008
(0.37)
0.006
(0.27)
0.006
(0.17)
-0.223***
(-5.83)
0.011
(0.42)
lnas 0.182***
(9.68)
0.384***
(18.20)
0.220***
(12.13)
0.182***
(9.68)
0.182***
(4.51)
0.365***
(13.22)
0.281***
(12.41)
lner 0.018***
(4.99)
0.046***
(7.41)
0.025***
(6.98)
0.018***
(4.99)
0.018***
(2.65)
0.042***
(4.78)
0.009*
(1.85)
lnpc 0.757***
(16.12)
0.820***
(19.37)
0.654***
(16.07)
0.757***
(16.12)
0.757***
(7.75)
0.804***
(15.01)
0.946***
(16.65)
lnea -0.017*
(-2.33)
-0.193***
(-15.48)
-0.025***
(-3.44)
-0.017**
(-2.33)
-0.017**
(-2.07)
-0.173***
(-6.60)
-0.008
(-0.97)
_cons 4.031***
(28.50)
5.352***
(33.38)
4.141***
(31.17)
4.031***
(28.50)
4.031***
(12.93)
5.555***
(20.85)
3.553***
(20.77)
F-test 157.49
[0.000]
157.49
[0.000]
131.11
[0.000]
LM-test 9994.53
[0.000]
Hausman test 52.02
[0.000]
Wald test 120000 [0.000]
Overidentification test 1.609
[0.447]
Weak instruments
test (F statistic)
2031/1314[0.000]
R-sq 0.572 0.855 0.805 0.572 0.572 0.856 0.368
Observation 3033 3033 3033 3033 3033 2359 3033