Environmental Risk Assessment System for Phosphogypsum Tailing Dams

Table 7

Scale of relative importance used in the pairwise comparison of AHP for 3-level factors.

(a)

	B1	B2
B1	(1,1,1,1)	(1/4,2/7,2/5,1/2)
B2	(2,5/2,7/2,4)	(1,1,1,1)

(b)

	B3	B4
B3	(1,1,1,1)	(1,1,1,1)
B4	(1,1,1,1)	(1,1,1,1)

(c)

	B5	B6	B7
B5	(1,1,1,1)	(2,5/2,7/2,4)	(2,5/2,7/2,4)
B6	(1/4,2/7,2/5,1/2)	(1,1,1,1)	(1,1,1,1)
B7	(1/4,2/7,2/5,1/2)	(1,1,1,1)	(1,1,1,1)

(d)

	B8	B9
B8	(1,1,1,1)	(1,3/2,5/2,3)
B9	(1/3,2/5,2/3,1)	(1,1,1,1)

(e)

	B10	B11	B12
B10	(1,1,1,1)	(1,1,1,1)	(1,1,1,1)
B11	(1,1,1,1)	(1,1,1,1)	(1,1,1,1)
B12	(1,1,1,1)	(1,1,1,1)	(1,1,1,1)