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
|