Table 1:
An example of a user-item matrix.
(a)
Alice: (like) Shrek, Snow White, (dislike) Superman
Bob: (like) Snow White, Superman, (dislike) spiderman
Chris: (like) spiderman, (dislike) Snow white
Tony: (like) Shrek, (dislike) Spiderman
(b)
Shrek
Snow White
Spider-man
Super-man
Alice
Like
Like
Dislike
Bob
Like
Dislike
Like
Chris
Dislike
Like
Tony
Like
Dislike
?