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

Table 2

Results of the normalization of the original input and output indicator data.

Indicator		Dalian	Yingkou	Tianjin	Rizhao	Tangshan	Qingdao	Yantai
Input indicator		−0.107	1.422	−0.141	0.063	−1.363	1.082	−0.956
		0.832	−1.160	−0.547	0.985	−0.547	1.291	−0.853
		0.637	−0.106	0.637	−0.850	1.381	−1.593	−0.106
		−0.691	−0.530	−0.350	1.020	1.802	−0.469	−0.782
		−0.672	−0.491	−0.491	2.041	0.052	0.413	−0.853
		−0.586	0.098	−0.586	−0.586	2.147	0.098	−0.586
		−0.817	−0.209	−0.596	1.174	1.423	0.239	−1.215
		−0.671	0.334	−0.584	−0.431	0.553	1.864	−1.064
		0.260	−0.188	−0.531	−0.814	0.135	2.033	−0.895
		−0.365	−0.635	1.010	−0.111	1.751	−0.866	−0.783
		−0.621	−0.562	2.029	−0.651	0.272	0.302	−0.770
Output indicator		−0.917	−0.730	−0.577	1.178	0.968	1.030	−0.953
		−0.790	1.861	−0.868	0.870	−0.381	−0.433	−0.260
		−0.029	0.213	−0.164	1.710	−0.864	0.536	−1.403
		0.565	−0.859	0.881	−0.226	−0.226	1.356	−1.492