Table 2 Grey close function value and the comprehensive analysis value.

Index	X₁	X₂	X₃	X₄	X₅	Comprehensive analysis value (P_i)
S₁	0.225	0.630	0.651	0.625	0.731	0.651
S₂	0.300	0.531	0.335	0.455	0.589	0.464
S₃	0.500	0.630	0.352	0.532	0.539	0.481
S₄	0.643	0.739	0.373	0.556	0.469	0.482
S₅	0.643	0.708	0.757	0.962	0.427	0.641
S₆	1.000	1.000	0.691	0.862	0.475	0.673
S₇	0.900	0.850	1.000	1.000	0.507	0.787
S₈	0.692	0.630	0.862	0.962	0.589	0.736
S₉	0.474	0.459	0.644	0.641	0.679	0.631
S₁₀	0.333	0.395	0.361	0.439	0.916	0.590
S₁₁	0.281	0.459	0.397	0.500	1.000	0.645

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