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

Table 7

Values of the principal components of the input and output indicators.

Port samples	Principal components of the input indicators				Principal components of the output indicators
	Dalian	−0.964	−0.968	−0.070	−0.106	−0.308	−0.986
Yingkou	−1.011	−0.370	0.601	−1.068	−0.659	1.941
Tianjin	0.693	−1.562	0.878	1.910	−0.034	−1.235
Rizhao	0.154	1.550	−2.669	0.499	1.690	1.417
Tangshan	3.979	0.804	0.588	−0.710	−0.096	−0.393
Qingdao	−1.973	2.905	1.287	0.199	1.614	−0.820
Yantai	−0.879	−2.358	−0.615	−0.725	−2.207	0.077