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

Table 5

Component matrix of the input and output indicators.

Indicator	Load of the principal components of the input indicators				Indicator	Load of the principal components of the output indicators
	1	2	3	4		1	2
	−0.694	0.378	0.219	0.022		0.794	−0.253
	−0.326	0.660	−0.250	0.307		0.431	0.830
	0.727	−0.554	0.194	−0.063		0.893	0.216
	0.843	0.443	−0.296	−0.054		0.469	−0.747
	0.107	0.722	−0.631	0.221
	0.753	0.354	0.363	−0.418
	0.598	0.749	−0.229	−0.054
	−0.060	0.823	0.534	−0.143
	−0.276	0.676	0.603	−0.048
	0.941	−0.038	0.153	0.288
	0.310	−0.041	0.532	0.766