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
Brentford 3 Portsmouth 2 +13.1
+14.5
+0.6
Crewe 1 Doncaster 2 -7.1
-3.6
-0.1
Shrewsbury 0 Bournemouth 3 -4.5
-6.2
-0.2
Sheff Utd 2 Brentford 2 -2.1
-2.0
+0.0
Sheff Utd 2 Swindon 0 -0.9
-1.9
-0.1
Stevenage 0 Yeovil 2 -0.8
-2.0
-0.1
Oldham 1 Yeovil 0 +0.4
+1.5
+0.1
Week of 4/20100.0*Chance wins title100.0*Championship100.0*Average seed
Doncaster 0 Notts County 1 +7.6
+6.9
+0.2
Bournemouth 3 Carlisle 1 -7.4
-9.0
-0.2
Hartlepool 1 Brentford 1 -5.7
-4.1
-0.1
Portsmouth 3 Sheff Utd 0 +0.5
+2.0
+0.1
Yeovil 1 Crewe 0 -0.3
-0.1
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
-27.9
-0.6
Tranmere 0 Bournemouth 0 No
-0.1
Bury 3 Yeovil 2 +0.2
Points
Chance Will Win Championship