Table 13 The gray correlation coefficient \(\xi_{ij}^{ - }\) from the alternative to the NIS.

From: Research on optimization of mining methods for broken ore bodies based on interval-valued pythagorean fuzzy sets and TOPSIS-GRA

\(\xi_{ij}^{ - }\)

C1

C2

C3

C4

C5

C6

C7

C8

C9

A1

0.8977

0.4658

0.5590

0.4806

0.4576

0.4795

0.5202

0.7876

0.7279

A2

1.000

0.6120

0.5590

0.4040

0.4934

0.6261

0.6215

1.000

1.000

A3

0.3810

1.000

0.9375

1.000

0.4934

1.000

1.000

0.3655

0.3333

A4

0.4172

0.4468

1.000

0.7102

1.000

0.4599

0.7628

0.4963

0.3517

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