Table 4 Expert evaluation scales for linguistic variables.

From: A robust fractional fuzzy decision support framework for sustainable energy planning

Linguistic variable

f, g, h-FrFS scale

YK: Fully skilled

(1, 0.1, 0.45)

GK: Highly skilled

(0.95, 0.2, 0.55)

RK: More skilled

(0.8, 0.35, 0.6)

SK: Skilled

(0.7, 0.5, 0.65)

AK: fairly skilled

(0.65, 0.35, 0.75)