How are these numbers calculated?

Big Games

How we did last week and who we should root for this week.   Explain

Week of 12/4100.0*Chance wins title100.0*Libertadores100.0*Average seed
Goias 0 Palmeiras 0 No
-6.5
-0.1
Atletico-PR 5 Sao Caetano 2 +8.0
+0.1
Vitoria 1 Sao Paulo 4 -2.6
Santos 5 Gremio 1 -0.4
Week of 12/11100.0*Chance wins title100.0*Libertadores100.0*Average seed
Sao Caetano 0 Santos 3 +28.9
+0.3
Palmeiras 3 Criciuma 2 +19.4
+0.3
Week of 12/19None
Points
Chance Will Win Championship