How are these numbers calculated?

Big Games

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

Week of 11/7100.0*Chance in playoffs100.0*Serie B100.0*Average seed
Gremio 3 Santos 0 -0.2
-0.8
Santos 1 Vitoria 0 +0.2
-0.3
+1.3
Vasco da Gama 1 Santos 2 -2.7
+1.1
Goias 4 Juventude 1 +0.1
Atletico-MG 5 Vasco da Gama 1 +0.1
Internacional 2 Parana 1 +0.1
Coritiba 0 Flamengo 0 +0.0
Criciuma 2 Palmeiras 1 +0.2
Fluminense 2 Atletico-PR 3 -0.1
+0.0
Bahia 4 Bragantino 2 +0.0
Sao Paulo 2 Gremio 1 -0.1
Week of 11/14100.0*Chance in playoffs100.0*Serie B100.0*Average seed
Santos 3 Atletico-PR 2 *No
+1.5
Bragantino 3 Sao Paulo 4 -0.0
Flamengo 3 Fluminense 1 No
Parana 2 Bahia 1 No
-0.1
Vasco da Gama 4 Criciuma 2 No
-0.1
Gremio 0 Coritiba 2 -0.3
Juventude 3 Botafogo 5 -0.0
Week of 11/21100.0*Chance in playoffs100.0*Serie B100.0*Average seed
Cruzeiro 2 Santos 1 -1.1
Juventude 1 Atletico-MG 0 -0.4
Vasco da Gama 0 Guarani 2 +0.2
Vitoria 1 Fluminense 3 +0.1
Portuguesa 4 Botafogo 1 +0.1
Corinthians 1 Coritiba 1 +0.1
Parana 1 Sao Paulo 1 -0.0

* 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