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Table 10 Comparison matrix and the consistency test

From: Wastewater treatment evaluation for enterprises based on fuzzy-AHP comprehensive evaluation: a case study in industrial park in Taihu Basin, China

Index

Comparison matrix B

Weight Ai

Consistency test

u11

1 1 1/2 1/2 4

0.168

λ max  = 5.0354

u12

1 1 1/2 1/2 4

0.168

CI = 0.00885

u13

2 2 1 1 5

0.306

RI = 1.12

u14

2 2 1 1 5

0.306

CR = CI/RI = 0.0079 < 0.1, meets the requirements of consistency

u15

1/4 1/4 1/5 1/5 1

0.052

 

u21

1 1 1/2 2

0.227

λ max  = 4.01

u22

1 1 1/2 2

0.227

CI = 0.003333

u23

2 2 1 3

0.423

RI = 0.90

u24

1/2 1/2 1/3 1

0.123

CR = CI/RI = 0.0037 < 0.1, meets the requirements of consistency

   

λ max  = 3

u31

1 1 1/2

0.25

CI = 0

u32

1 1 1/2

0.25

RI = 0.58

u33

2 2 1

0.5

CR = CI/RI = 0 < 0.1, meets the requirements of consistency