Investigating the Temporal Effect of User Preferences with Application in Movie Recommendation

Table 1

Basic statistics of three data sets. The sparsity is defined as , where is the number of ratings and and denote the numbers of users and items.

Data set	# users	# items	# links	Sparsity	Rating scale
MovieLens	943	1682	100000		1–5
Netflix	3000	3000	97367		1–5
MovieTweetings	2583	9111	67040		1–10