From: Similarity testing for role-based access control systems
Pairs (t i ,t j )
ndt
avg
d s d (t i ,t j )
(t0,t1)
4.0
2.0
(t0,t2)
3.0
1.5
(t0,t3)
(t1,t2)
5.0
2.5
(t1,t3)
6.0
(t2,t3)