Variable

$X_1$

$X_2$

$X_3$

$X_4$

$X_5$

$X_6$

$X_7$

$X_8$

Gray relational grade

0.9482

0.5929

0.7555

0.8198

0.5637

0.6486

0.8689

0.7816

Order

1

7

5

3

8

6

2

4