How are these numbers calculated?

Big Games

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

Week of 11/23100.0*Chance wins title100.0*Promoted100.0*Average seed
Vitoria 4 Gremio 2 -18.5
-1.5
-0.5
Vasco da Gama 1 Sao Paulo 2 -12.0
-0.1
Cruzeiro 3 Flamengo 2 +0.7
-0.3
+0.0
Palmeiras 2 Ipatinga 0 -0.2
-0.4
-0.0
Week of 11/30100.0*Chance wins title100.0*Promoted100.0*Average seed
Ipatinga 1 Gremio 4 +3.9
+4.9
+0.4
Sao Paulo 1 Fluminense 1 +1.8
+0.0
Internacional 1 Cruzeiro 0 +2.0
+0.2
Vitoria 0 Palmeiras 0 +1.6
+0.1
Flamengo 3 Goias 3 +0.9
+0.1
Week of 12/7100.0*Chance wins title100.0*Promoted100.0*Average seed
Gremio 2 Atletico-MG 0 +13.1
+0.1
Goias 0 Sao Paulo 1 No
-0.1
Points
Chance Will Win Championship