Application of Fuzzy Linguistic Rating and Entropy-Based GRA to Address Uncertainty in Safety Performance Index Construction

Table 1

Transformation of linguistic variables to fuzzy numbers.

Linguistic variable	Fuzzy number
Never	(0.0, 0.0, 0.1, 0.2)
Rarely	(0.1, 0.2, 0.3, 0.4)
Sometimes	(0.3, 0.4, 0.4, 0.5)
Often	(0.4, 0.5, 0.6, 0.7)
Very often	(0.6, 0.7, 0.8, 0.9)
Always	(0.8, 0.9, 1.0, 1.0)