Table 2.

Fuzzy linguistic scale

Linguistic term	DHq-ROF membership values	DHq-ROF non-membership values
Certainly high (CH)	0.95	0.15
Very high (VH)	0.85	0.25
High (H)	0.75	0.35
Above average (AA)	0.65	0.45
Average (A)	0.55	0.55
Under average (UA)	0.45	0.65
Low (L)	0.35	0.75
Very low (VL)	0.25	0.85
Certainly low (CL)	0.15	0.95