Safety Assessment in Road Construction Work System Based on Group AHP-PCA

Table 3

The fundamental scale of absolute numbers for AHP (adopted from [45]).

Numerical values	Verbal gradation
1	Element i is as important as element j
3	Element i is moderately more important than element j
5	Element i is strongly more important than element j
7	Element i is very strongly more important than element j
9	Element i is extremely more important than element j
2,4,6,8	The importance of i relative to j is between adjacent judgments
1,1/2, …, 1/8,1/9	Element i is less important than element j correspondingly