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

Table 10

Efficiency of the DEA evaluation of the operational efficiency of the iron ore logistics in Bohai Bay.

Port DMU	Relative efficiency	Scale efficiency	Technology efficiency
Dalian	No DEA efficiency	Return to scale increases progressively	Inefficient
Yingkou	DEA efficiency	Unchanged scale benefit	Efficient
Tianjin	DEA efficiency	Unchanged return to scale	Efficient
Rizhao	DEA efficiency	Unchanged return to scale	Efficient
Tangshan	No DEA efficiency	Return to scale decreases progressively	Inefficient
Qingdao	DEA efficiency	Unchanged return to scale	Efficient
Yantai	DEA efficiency	Unchanged return to scale	Efficient