How are these numbers calculated?

Big Games

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

Week of 10/24100.0*Chance in playoffs100.0*Average seed
Portuguesa 1 Internacional 1 +0.3
-0.4
Cruzeiro 3 Palmeiras 1 -0.2
+0.1
Vasco da Gama 0 Vitoria 1 +0.1
Gremio 2 America-RN 1 -0.1
Coritiba 1 Atletico-MG 1 +0.1
+0.1
Flamengo 2 Guarani 1 -0.1
Sport Recife 2 Botafogo 1 -0.1
-0.1
Vasco da Gama 3 Coritiba 1 +0.2
Santos 1 Parana 2 +0.2
Sao Paulo 1 Corinthians 2 -0.1
America-RN 2 Santos 2 +0.1
Week of 10/31100.0*Chance in playoffs100.0*Average seed
Atletico-MG 1 Sport Recife 0 -0.2
+0.2
Atletico-PR 1 Cruzeiro 2 -0.1
Internacional 0 Botafogo 0 +0.1
Portuguesa 3 Bragantino 1 In
+0.7
Guarani 1 Gremio 3 -0.1
Santos 3 Goias 1 -0.2
Palmeiras 3 Parana 2 -0.1
Vitoria 2 Corinthians 3 -0.1
Week of 11/7100.0*Chance in playoffs100.0*Average seed
Gremio 4 Portuguesa 2 -0.8
Coritiba 1 Internacional 0 -0.3
Botafogo 2 Santos 1 +0.3
Sport Recife 2 Guarani 1 -0.2
Palmeiras 2 Vasco da Gama 1 -0.1
Points
Chance Will Make Playoffs