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*Average seed
Fluminense 2 Atletico-PR 3 +0.1
+0.5
Santos 1 Vitoria 0 +0.0
Guarani 0 Portuguesa 1 +0.1
Atletico-MG 5 Vasco da Gama 1 -0.1
Criciuma 2 Palmeiras 1 +0.2
Sao Paulo 2 Gremio 1 +0.2
Gremio 3 Santos 0 -0.1
Botafogo 0 Cruzeiro 0 +0.1
Week of 11/14100.0*Chance in playoffs100.0*Average seed
Corinthians 1 Goias 1 *In
Santos 3 Atletico-PR 2 -0.8
Gremio 0 Coritiba 2 +0.2
Cruzeiro 3 Sport Recife 1 -0.2
Cruzeiro 0 Coritiba 0 +0.1
Palmeiras 2 Atletico-MG 0 -0.0
Week of 11/21100.0*Chance in playoffs100.0*Average seed
Atletico-PR 1 Criciuma 2 -1.7
Atletico-MG 3 Atletico-PR 2 -1.1
Palmeiras 4 Sport Recife 1 -0.4
Vasco da Gama 0 Guarani 2 -0.4
Juventude 1 Atletico-MG 0 +0.3
Cruzeiro 2 Santos 1 -0.3
Sao Paulo 1 Cruzeiro 0 +0.2
Gremio 1 Goias 3 +0.2

* 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