Dealing with Pure New User Cold-Start Problem in Recommendation System Based on Linked Open Data and Social Network Features

Table 3

Example of User-Item Rating Matrix (UIM).

	Item 1	Item 2	Item 3	Item 4
User 1	5	5	—	5
User 2	5	—	3	4
User 3	3	4	—	3
User 4	—	—	5	3
User 5	5	4	4	5
User 6	5	4	5	5