Fuzzy Comprehensive Evaluation of Happiness Index of Nine Cities in Pearl River Delta Based on AHP

Table 9

Evaluation grade of membership value (U) and D value.

Membership value (U) and (D) value	Evaluation level
0.8 ≤ U/D < 1.0	Excellent
0.7 ≤ U/D < 0.8	Good
0.5 ≤ U/D < 0.7	Middle
0.3 ≤ U/D < 0.5	General
0.0 ≤ U/D < 0.3	Unsatisfactory