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 +18.1
+21.0
+0.8
Crewe 1 Doncaster 2 -8.3
-5.4
-0.2
Brentford 3 Portsmouth 2 -2.5
-3.0
-0.1
Sheff Utd 2 Brentford 2 +2.4
+3.8
+0.1
Sheff Utd 2 Swindon 0 -1.7
-3.1
-0.1
Stevenage 0 Yeovil 2 -0.9
-2.7
-0.2
Oldham 1 Yeovil 0 +0.6
+2.5
+0.1
Week of 4/20100.0*Chance wins title100.0*Championship100.0*Average seed
Doncaster 0 Notts County 1 +17.7
+8.6
+0.3
Bournemouth 3 Carlisle 1 +11.5
+13.7
+0.4
Hartlepool 1 Brentford 1 +3.7
+5.5
+0.1
Portsmouth 3 Sheff Utd 0 +0.8
+3.4
+0.1
Yeovil 1 Crewe 0 -0.3
Week of 4/27100.0*Chance wins title100.0*Championship100.0*Average seed
Brentford 0 Doncaster 1 -41.9
-0.4
Tranmere 0 Bournemouth 0 +5.2
+0.1
Points
Chance Will Win Championship