Table 5 Data initialization results.

From: A new method for evaluating air quality using an ideal grey close function cluster correlation analysis method

Index

x1

x2

x3

x4

x5

\(S_{1}^{\prime }\)

1.000

1.322

7.676

2.371

6.967

\(S_{2}^{\prime }\)

1.000

1.312

4.426

1.709

5.057

\(S_{3}^{\prime }\)

1.000

2.043

5.261

2.217

12.130

\({\text{S}}_{01}^{\prime }\)

1.000

2.000

2.000

0.750

5.000

\({\text{S}}_{02}^{\prime }\)

1.000

0.667

1.167

0.583

2.667

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