How are these numbers calculated?

Big Games

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

Week of 4/13100.0*Chance wins title100.0*Championship100.0*Average seed
Shrewsbury 0 Bournemouth 3 +17.1
+18.0
+0.6
Crewe 1 Doncaster 2 -9.4
-4.6
-0.2
Brentford 3 Portsmouth 2 -4.6
-6.2
-0.2
Sheff Utd 2 Brentford 2 +3.0
+4.8
+0.1
Sheff Utd 2 Swindon 0 -1.4
-3.5
-0.1
Stevenage 0 Yeovil 2 -0.8
-2.8
-0.1
Oldham 1 Yeovil 0 +0.4
+2.0
+0.1
Week of 4/20100.0*Chance wins title100.0*Championship100.0*Average seed
Bournemouth 3 Carlisle 1 +23.2
+20.7
+0.6
Doncaster 0 Notts County 1 +10.9
+3.7
+0.2
Hartlepool 1 Brentford 1 +1.8
+2.5
+0.1
Portsmouth 3 Sheff Utd 0 +0.6
+3.0
+0.1
Yeovil 1 Crewe 0 -1.2
-0.1
Week of 4/27100.0*Chance wins title100.0*Championship100.0*Average seed
Brentford 0 Doncaster 1 -25.5
-0.3
Points
Chance Will Win Championship