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*Conference Nat’l100.0*Average seed
Northampton 0 York 2 -37.1
+1.6
Wycombe 2 Aldershot Town 1 -3.1
+0.1
AFC Wimbledon 2 Exeter City 2 -1.0
+0.0
Burton Albion 1 Plymouth Argyle 0 -1.0
+0.0
Dag & Red 0 Oxford United 1 -0.2
+0.1
Week of 4/20100.0*Conference Nat’l100.0*Average seed
York 2 Southend 1 -20.7
+1.3
Barnet 1 Wycombe 0 +6.3
-0.2
Gillingham 2 AFC Wimbledon 2 +4.9
-0.1
Morecambe 0 Torquay United 2 +2.5
-0.2
Aldershot Town 1 Dag & Red 0 +1.9
+0.0
Bristol Rovers 0 Accrington 1 +0.3
-0.2
Plymouth Argyle 0 Rotherham 1 -0.1
+0.1
Week of 4/27100.0*Conference Nat’l100.0*Average seed
AFC Wimbledon 2 Fleetwood Town 1 +11.6
-0.3
Dag & Red 0 York 1 No
+2.6
Northampton 2 Barnet 0 No
+0.3
Rochdale 1 Plymouth Argyle 0 -1.0
+0.2
Torquay United 3 Bristol Rovers 3 +0.3
Accrington 0 Oxford United 3 +0.1
Southend 0 Morecambe 1 -0.1
Points
Chance Will Win Championship