Qinghai

(Constant)

length of highways (km)

length of railways in operation (km)

−10,163.314

14.578

−0.108

16,075.344

22.703

0.686

0.673

−0.166

−0.632

0.642

−0.158

0.551

0.545

0.880

−49,498.264

−40.974

−1.786

29,171.636

70.131

1.569

Ningxia

(Constant)

length of highways (km)

length of railways in operation (km)

−49,228.595

18.885

1.997

27,452.731

30.031

0.861

0.190

0.702

−1.793

0.629

2.319

0.123

0.553

0.060

−116,403.008

−54.600

−0.110

17,945.817

92.369

4.105

Xinjiang

(Constant)

length of highways (km)

length of railways in operation (km)

−310,552.721

−62.760

0.150

513,292.556

82.767

0.056

−1.099

0.909

−0.605

−0.758

0.929

0.567

0.477

0.388

−1.567E6

−265.283

−8.107

945,428.917

139.762

18.039