Table 6: User u direct reliability at time t.

Reliability	t1	t2	t3	t4	t5
s(a=0.5)	0.8013	0.7163	0.6972	0.6788	0.6560
s (a=0.4)	0.7978	0.7069	0.6864	0.6673	0.6438
s (a=0.3)	0.7929	0.6941	0.6716	0.6516	0.6272
s (a=0.2)	0.7852	0.6751	0.6495	0.6283	0.6023
s (a=0.1)	0.7700	0.6420	0.6098	0.5873	0.5578
PR	0.6667	0.5128	0.4545	0.4167	0.3704