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
Atletico-PR 5 Sao Caetano 2 -14.1
-0.1
Santos 5 Gremio 1 +12.7
Yes
+0.3
Vitoria 1 Sao Paulo 4 -2.1
-0.1
Goias 0 Palmeiras 0 +0.4
Week of 12/11100.0*Chance wins title100.0*Libertadores100.0*Average seed
Sao Caetano 0 Santos 3 +22.6
+0.4
Vasco da Gama 1 Atletico-PR 0 +18.3
+0.2
Sao Paulo 1 Flamengo 1 +1.4
+0.1
Week of 12/19100.0*Chance wins title100.0*Libertadores100.0*Average seed
Atletico-PR 1 Botafogo 1 Yes
+0.3
Santos 2 Vasco da Gama 1 Yes
+0.3
Points
Chance Will Win Championship