How are these numbers calculated?

Big Games

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

Week of 2/6None
Week of 2/13100.0*Chance wins title100.0*Average seed
Vasco da Gama 0 Internacional 2 +17.8
+0.3
Flamengo 2 Corinthians 1 -14.9
-0.2
Gremio 1 Sao Paulo 2 -1.7
-0.1
Atletico-MG 1 Bahia 1 +1.3
+0.0
Sao Paulo 1 Palmeiras 1 +0.8
Week of 2/20100.0*Chance wins title100.0*Average seed
Flamengo 2 Internacional 1 -43.4
-0.4
Internacional 0 Corinthians 0 No
-0.2
Sao Paulo 2 Flamengo 1 +14.4
+0.1
Points
Chance Will Win Championship