How are these numbers calculated?

Big Games

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

Week of 1/15100.0*Chance wins title100.0*Average seed
Chapecoense 1 Ponte Preta 0 +18.8
+0.2
Vitoria 0 Chapecoense 0 -13.3
-0.1
America-MG 1 Botafogo-SP 1 +12.9
+0.1
Brasil de Pelotas 0 America-MG 0 +12.0
+0.1
Week of 1/22100.0*Chance wins title100.0*Average seed
Operario-PR 2 Chapecoense 0 -25.4
-0.3
Confianca 0 America-MG 0 +12.6
+0.1
Week of 1/29100.0*Chance wins title100.0*Average seed
America-MG 2 Avai 1 -26.6
-0.3
Chapecoense 3 Confianca 1 +22.6
+0.2
Points
Chance Will Win Championship