Operational Efficiency Evaluation of Iron Ore Logistics at the Ports of Bohai Bay in China: Based on the PCA-DEA Model

Table 1

Evaluation system for the indicators of the operational efficiency of the iron ore logistics at the ports of Bohai Bay, China.

Primary indicator	Secondary indicator	Properties and symbols of the indicators
Natural conditions of the ports	Water depth of the navigation channel	Input indicator
	Width of the main navigation channel	Input indicator
	Average water depth of the berth	Input indicator
Infrastructures related to iron ore logistics service	Total length of the berth	Input indicator
	Number of berths	Input indicator
	Number of berths of over 150,000 tons	Input indicator
	Area of the iron ore storage yard	Input indicator
	Volume of the iron ore stock	Input indicator
	Number of loading and unloading machines	Input indicator
Scale and capacity of the iron ore logistics services of the port	Designed iron ore carrying capacity	Input indicator
	Iron ore throughput	Output indicator
	Growth of iron ore throughput	Output indicator
Iron ore collection and distribution capacity	Length of the railway line in the port	Input indicator
	Ship-loading efficiency of a single iron ore line	Output indicator
	Iron ore unloading efficiency	Output indicator