Comprehensive Analysis of Stability of Coal Seam Composite Roof Based on Analytic Hierarchy Process

Table 4

9-scale method.

Degree of importance	Definition
1	Representing two factors, the former is as important as the latter
3	Representing two factors, the former is slightly more important than the latter
5	Representing two factors, the former is generally more important than the latter
7	Representing two factors, the former is more important than the latter
9	Representing two factors, the former is absolutely more important than the latter
2, 4, 6, 8	Representing two factors, the former is more important than the latter between the above adjacent levels