Relationship between Urban Innovation Capability and Energy Utilization Efficiency: An Empirical Study of 281 Prefecture-Level Cities in China

Table 2

Unit root test for core variables.

Variable	Method			Conclusion
	LLC	HT	ADF	LLC	HT	ADF
	−9.1795	0.5182	1140.7838	Steady	Steady	Steady
	−9.3768	0.7563	684.5540	Steady	Steady	Steady

Note. , , and represent the significance levels at 1%, 5%, and 10%, respectively.