Table 2.

Grey close function value and the comprehensive analysis value.

Index	X1	X2	X3	X4	X5	Comprehensive analysis value (Pi)
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