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
Flamengo 2 Corinthians 1 +16.7
+0.3
Vasco da Gama 0 Internacional 2 -15.9
-0.2
Gremio 1 Sao Paulo 2 -0.7
-0.1
Atletico-MG 1 Bahia 1 +0.6
+0.0
Week of 2/20100.0*Chance wins title100.0*Average seed
Flamengo 2 Internacional 1 +43.4
+0.5
Internacional 0 Corinthians 0 Yes
+0.2
Sao Paulo 2 Flamengo 1 -14.4
-0.1
Points
Chance Will Win Championship