Spatiotemporal Coupling Coordination Analysis of Social Economy and Resource Environment of Central Cities in the Yellow River Basin

Table 2

Classification of coupling degree.

Coupling degree	Coupling type	Description
0–0.29	Low coupling	The two subsystems are starting to game, and the coupling is at a low level
0.3–0.49	Antagonism stage	The interaction between the two subsystems intensifies, with the dominant subsystem beginning to occupy space in the other subsystem and the other subsystem declining
0.5–0.79	Running-in stage	The two subsystems check and coordinate with each other and exhibit positive coupling characteristics
0.8–1	Coordinated coupling stage	The benign coupling between the two subsystems becomes stronger and gradually develops in an orderly direction and is at a high level of coupling and coordination