Optimal Hierarchical Decision-Making for Heat Source Selection of District Heating Systems

Table 3

The definition table of nine-class scale.

Rating scale	Definition (comparing index with index )
1	Indices and are important equally
3	Index is slightly more important than
5	Index is more important than
7	Index is more important than
9	Index is absolutely more important than
2, 4, 6, 8	Middle important value between above scales