Efficiency Evaluation of Energy in Northeastern China Based on Data Envelopment Analysis

Table 1

Index system.

Input/output	Categories of index	Name of index
Input index	Oil, coal, and other consumption	Synthetic energy consumption
	Industrial consumption of electricity	Electricity consumption
Output index	Desirable output	Per capita GDP
		Total retail sales of consumer goods
	Undesirable output	Industrial waste gas emission
		Industrial wastewater discharge
		Industrial solid waste production