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Table 2 Triangular fuzzy (TFN) scale and its inverse TFN scale for the linguistic pairwise comparison scale

From: Sustainability indices for energy utilization using a multi-criteria decision model

 

Rating scale

Triangular fuzzy numbers

Triangular fuzzy reciprocal numbers

Just equal

 

1

1

1

1

1

1

Equal importance

1

1/2

1/1

3/2

2/3

1/1

2/1

Weak importance of one over another

2

1/1

3/2

2/1

1/2

2/3

1/1

Moderate importance of one over another

3

3/2

2/1

5/2

2/5

1/2

2/3

Very strong importance

4

2/1

5/2

3/1

1/3

2/5

1/2

Extremely strong importance

5

5/2

3/1

7/2

2/7

1/3

2/5