| Variables | Statistics | Variables | Statistics | Variables | Statistics |
|---|---|---|---|---|---|
| LM lag | 26.778*** | LR lag | 22.98*** | Wald lag | 19.84** |
| LM error | 20.354*** | LR error | 20.72*** | Wald error | 17.58** |
Figure 2 The geographic location of cities that implemented administrative division adjustment between 2013 and 2018
Figure 4 The spatiotemporal evolution of urban polycentricity in China in different years: (a) 2013, (b) 2014, (c) 2015, (d) 2016, (e) 2017 and (f) 2018