How are these numbers calculated?

Big Games

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

Week of 11/15100.0*Serie C100.0*Average seed
America-MG 3 Atletico-GO 0 +18.8
-0.7
ABC 4 ASA 1 +6.0
-0.2
Icasa 2 Paysandu 1 -4.4
+0.2
Guaratingueta 0 Ceara 1 -4.3
+0.1
Avai 0 America-RN 1 +1.7
-0.1
Oeste 2 Figueirense 2 +0.3
-0.0
Chapecoense 1 Bragantino 1 -0.1
+0.0
Sao Caetano 3 Joinville 2 -0.1
Week of 11/22100.0*Serie C100.0*Average seed
Oeste 2 Atletico-GO 4 -20.3
+0.7
Guaratingueta 3 Parana 4 -9.2
+0.2
Paysandu 0 Bragantino 1 -3.9
+0.2
ABC 1 Avai 0 +0.6
-0.1
Sao Caetano 2 America-RN 2 -0.2
+0.1
Week of 11/29100.0*Serie C100.0*Average seed
Atletico-GO 2 Guaratingueta 0 No
+0.8
Sport Recife 0 Paysandu 0 +0.2
Points
Chance Will Win Championship