Developing a Subway Fire Risk Assessment Model Based on Analysis Theory

Table 2

The 1–9 scale method for rating the relative importance of two indicators.

Scale	Meaning
1	It suggests that when the two indicators are compared, the former is as important as the latter
3	It indicates that when the two indicators are compared, the former is a little more important than the latter
5	It means that when the two indicators are compared, the former is much more important than the latter
7	It means that when the two indicators are compared, the former is very strongly more important than the latter
9	It indicates that when the two indicators are compared, the former is much more important than the latter
2, 4, 6, and 8	These represent the intermediate values of the adjacent judgments
Reciprocal	If the ratio of the importance of index factor i to index factor j is aij, then the ratio of the importance of index factor j to index factor i is aij = 1aij, which is reciprocal to each other