How are these numbers calculated?

Big Games

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

Week of 2/6100.0*Chance wins title100.0*Libertadores100.0*Average seed
Atletico-GO 1 Santos 1 +0.5
Botafogo 2 Gremio 5 -0.2
-0.1
Week of 2/13100.0*Chance wins title100.0*Libertadores100.0*Average seed
Palmeiras 3 Fortaleza 0 +2.0
+0.5
Flamengo 2 Corinthians 1 No
+0.5
+0.0
Vasco da Gama 0 Internacional 2 No
Gremio 1 Sao Paulo 2 +0.1
+0.1
Santos 2 Coritiba 0 -0.4
Sao Paulo 1 Palmeiras 1 Yes
-0.1
Athletico-PR 2 Atletico-GO 1 -0.2
Atletico-MG 1 Bahia 1 +0.0
Week of 2/20100.0*Chance wins title100.0*Libertadores100.0*Average seed
Bragantino 1 Gremio 0 +0.3
Atletico-MG 2 Palmeiras 0 -0.3
Palmeiras 1 Atletico-GO 1 -0.2
Gremio 1 Athletico-PR 0 -0.2
Santos 1 Fluminense 1 +0.1
Botafogo 1 Sao Paulo 0 +0.1
Sport Recife 2 Atletico-MG 3 -0.0
Points
Chance Will Win Championship