Table 7 Principal component coefficient, eigenvalue and contribution rate.

Principal components	X₁	X₂	X₃	X₄	X₅	X₆	X₇	X₈	X₉	X₁₀	X₁₁	X₁₂	X₁₃	X₁₄	X₁₅	Eigen value	Contribution rate (%)	Cumulative contribution rate (%)
1	0.775	− 0.035	0.422	0.569	0.942	0.878	0.397	− 0.873	− 0.705	0.150	0.037	0.427	0.325	0.325	− 0.506	4.855	32.364	32.364
2	0.130	− 0.360	0.617	0.773	− 0.016	− 0.191	− 0.110	− 0.275	0.456	0.822	− 0.326	0.337	− 0.726	− 0.726	0.569	3.732	24.883	57.247
3	0.538	− 0.765	0.545	− 0.107	− 0.317	0.040	− 0.591	− 0.136	0.024	0.089	0.463	− 0.662	0.508	0.508	0.581	3.167	21.115	78.362
4	0.257	0.364	− 0.221	0.221	− 0.061	0.230	0.556	0.243	0.481	0.535	0.706	− 0.432	− 0.002	− 0.002	− 0.092	1.932	12.879	91.241

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