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
Crewe 1 Doncaster 2 -9.5
-4.2
-0.2
Brentford 3 Portsmouth 2 +7.6
+8.3
+0.4
Shrewsbury 0 Bournemouth 3 -5.5
-6.6
-0.2
Sheff Utd 2 Brentford 2 +3.3
+4.1
+0.3
Sheff Utd 2 Swindon 0 -1.5
-2.3
-0.1
Stevenage 0 Yeovil 2 -1.1
-2.2
-0.1
Oldham 1 Yeovil 0 +0.4
+1.5
+0.2
Week of 4/20100.0*Chance wins title100.0*Championship100.0*Average seed
Hartlepool 1 Brentford 1 -12.2
-8.4
-0.3
Doncaster 0 Notts County 1 +10.4
+11.7
+0.3
Bournemouth 3 Carlisle 1 -4.0
-6.4
-0.1
Portsmouth 3 Sheff Utd 0 +0.4
+2.1
+0.2
Yeovil 1 Crewe 0 -0.1
-0.0
Crewe 1 Sheff Utd 0 +0.1
Week of 4/27100.0*Chance wins title100.0*Championship100.0*Average seed
Brentford 0 Doncaster 1 No
-38.6
-0.8
Tranmere 0 Bournemouth 0 No
-0.1
Bury 3 Yeovil 2 +0.2
Points
Chance Will Win Championship