Energy and Environmental Efficiency of China’s Transportation Sector: A Multidirectional Analysis Approach

Table 4

Correction matrix of inputs and outputs variables.

	Labor	Capital	Energy	Value-added	CO2
Labor	1
Capital	0.599**	1
Energy	0.783**	0.731**	1
Value-added	0.678**	0.786**	0.804**	1
CO2	0.774**	0.722**	0.999**	0.793**	1

∗∗shows significant correlation at 0.01 significance level (2-tailed).