How are these numbers calculated?

Big Games

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

Week of 3/21100.0*Chance wins title100.0*Semi-Final100.0*Average seed
Flamengo 2 Vasco da Gama 1 -23.5
-2.7
-0.6
Boavista 1 Vasco da Gama 2 +6.5
+2.4
+0.3
Barra Mansa 1 Botafogo 1 +4.1
+0.2
+0.1
Madureira 1 Bonsucesso 1 +3.4
+0.9
+0.2
Cabofriense 0 Botafogo 1 -3.2
-0.1
-0.1
Flamengo 2 Bangu 1 -3.1
-0.4
-0.1
Volta Redonda 0 Madureira 3 -2.7
-0.4
-0.1
Fluminense 1 Tigres do Brasil 1 +0.7
+1.0
+0.0
Macae 1 Bangu 1 +0.2
+0.4
Fluminense 3 Cabofriense 0 -0.1
-1.1
-0.0
Resende 2 Macae 2 +0.8
Volta Redonda 1 Tigres do Brasil 1 +0.3
Week of 3/28100.0*Chance wins title100.0*Semi-Final100.0*Average seed
Vasco da Gama 1 Botafogo 1 -8.6
+0.4
-0.1
Bonsucesso 0 Flamengo 2 -4.9
-0.1
-0.1
Madureira 1 Macae 0 -1.7
-0.6
-0.1
Fluminense 4 Barra Mansa 2 -0.1
-0.9
Week of 4/5100.0*Chance wins title100.0*Semi-Final100.0*Average seed
Friburguense 5 Vasco da Gama 4 -17.7
-13.7
-1.1
Flamengo 3 Fluminense 0 -12.1
+2.2
-0.1
Botafogo 4 Madureira 1 -2.1
+1.3
-0.0
Madureira 1 Fluminense 2 -6.7
Vasco da Gama 4 Volta Redonda 1 Yes
+0.4
Botafogo 1 Macae 0 -0.1
Points
Chance Will Win Championship