Table 6

Test II for the mechanism of impact [3]

Explained variable(1)(2)(3)(4)(5)(6)
Ielninnoroadlninnorevlninno
test0.026*** (0.008)0.347*** (0.032)0.075*** (0.020)0.435*** (0.044)0.005*** (0.001)0.480*** (0.040)
ie 0.372*** (0.070)    
road   0.357*** (0.042)  
rev     5.324*** (0.589)
constant0.562*** (0.071)0.972*** (0.289)−0.402*** (0.099)1.900*** (0.318)−0.001 (0.006)−8.551*** (0.206)
Sobel test0.010
(z = 2.79, p = 0.005) (Z = 2.79, p = 0.005)		0.027
(z = 3.45, p = 0.001) (Z = 3.45, p = 0.001)		0.026
(z = 3.88, p = 0.000) (Z = 3.88, p = 0.000)
Bootstrapping (indirect effect)0.010
(z = 1.99, p = 0.046) (Z = 1.99, p = 0.046)		0.027
(z = 3.43, p = 0.001) (Z = 3.43, p = 0.001)		0.026
(z = 2.98, p = 0.003) (Z = 2.98, p = 0.003)
Bootstrapping (direct effect)0.347
(z = 10.80,p = 0.000) (Z = 10.80, p = 0.000)		0.435
(z = 7.25, p = 0.000) (Z = 7.25, p = 0.000)		0.480
(z = 9.32, p = 0.000) (Z = 9.32, p = 0.000)
Proportion of indirect effects2.69%5.83%5.16%
N3,7633,7632,9462,9463,7613,761
R20.7160.9680.8730.9560.8230.952

Note(s): *, ** and *** indicate that the regression coefficient is significant at the levels of 10%, 5% and 1%, respectively

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