Evaluation of the Effects of the Belt and Road Initiative on the Unified Economic and Environmental Efficiency of Transportation Infrastructure in China Based on Range-Adjusted Measure Model and Difference in Difference Model

Table 1

Indicators used to assess unified economic and environmental efficiency of transportation infrastructure.

Category	Indicator	Quantized value	Unit	Data source
Input indicators	Capital stock	Capital stock of the transportation industry	RMB 100 million	China Statistical Yearbook
	Labor	Number of persons employed in the transportation industry	Persons	China Statistical Yearbook
	Energy consumption	Energy consumption in the transportation industry	10,000 t standard coal	China Energy Statistical Yearbook
Output indicators	Desirable output	Gross production of the transportation industry	RMB 100 million	China Statistical Yearbook
		Comprehensive converted turnover of the transportation industry	100 million ton kilometer	China Statistical Yearbook
	Undesirable output	CO2 mission of the transportation industry	10,000 t	China Energy Statistical Yearbook, 2006 IPCC Guidelines for National Greenhouse Gas Inventories