8. Item-‐Based
Collabora/ve
Filtering
• Games
with
>
30
ra/ngs
• Users
who
have
rated
>
10
games
Ø ~10,000
board
games
Ø ~70,000
board
game
geek
aficionados
Ø ~5.5
million
total
ra/ngs
10,000
Games
70,000
Users
10,000
Games
10,000
Games
Ra/ngs
Similarity
1
1
1
1
9. Valida/on
In
top
N
recommenda/ons
Had
score
above
user’s
average
ra/ng
TP
Compare:
1. Rankings
from
Collabora/ve
Filtering
2. Popularity
ranking
from
average
ra/ng
from
boardgamegeek.com