Exploring Coupling Relationship between Urban Connection and High-quality Development Using the Case of Lanzhou-Xining Urban Agglomeration

Table 5

Regression results of HDI and four UCIs.

Variable	Coefficient estimates
lnIC	0.317 (0.172)
lnTC	0.159 (0.072)
lnNC	0.013 (0.021)
lnINC	0.023 (0.017)
Constant	−4.989 (1.072)
R-squared	0.876
City FE	Yes
Year FE	No
Number of observations	27

Note: , , and indicate significant correlation at 1%, 5%, and 10% confidence level. The numbers in parentheses indicate the standard error.