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 -5.1
-0.2
Vasco da Gama 3 Coritiba 1 -3.5
-0.2
Gremio 2 America-RN 1 -3.4
-0.2
Cruzeiro 3 Palmeiras 1 -3.3
-0.2
Vasco da Gama 0 Vitoria 1 +2.1
+0.0
Flamengo 2 Guarani 1 -1.4
-0.1
America-MG 2 Atletico-PR 1 +1.2
+0.1
Coritiba 1 Atletico-MG 1 +1.1
+0.0
Sport Recife 2 Botafogo 1 -1.0
-0.0
Sao Paulo 1 Corinthians 2 +0.2
Goias 2 Juventude 2 *+0.1
Week of 10/31100.0*Chance in playoffs100.0*Average seed
Internacional 0 Botafogo 0 -11.6
-0.5
Atletico-MG 1 Sport Recife 0 -6.3
-0.2
Guarani 1 Gremio 3 -5.5
-0.3
Atletico-PR 1 Cruzeiro 2 -5.1
-0.2
Flamengo 2 America-MG 0 -4.9
-0.3
Vitoria 2 Corinthians 3 +2.4
+0.2
Week of 11/7100.0*Chance in playoffs100.0*Average seed
Coritiba 1 Internacional 0 Out
-1.5
Cruzeiro 5 Juventude 0 -7.4
-0.2
Gremio 4 Portuguesa 2 -7.4
-0.3
Ponte Preta 0 Atletico-MG 0 -5.2
-0.1
Parana 2 Flamengo 1 +4.5
+0.2
Goias 2 Vasco da Gama 2 +4.5
+0.1
Palmeiras 2 Vasco da Gama 1 +2.8
+0.1
Bragantino 0 Vitoria 0 +0.1

* A starred number could be exactly 0 or just really small. The simulation did not run long enough to know.

Points
Chance Will Make Playoffs