Table 2. Experimental datasets.

	MovieLens	Netflix Prize	Epinions Trustlet
#Customers	943	480,189	4,718
#Products	1,682	17,770	36,165
#Rating	100,000	100,480,507	346,035
Sparsity level	0.93	0.98	0.99
Date	1997–1998	1999–2005	1999
#Periods	7 months	6 years	11 months
Temporal vector	#seconds	#days	#months
Products	Movie	Movie	Product