How are these numbers calculated?

Big Games

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

Week of 4/24100.0*Promoted100.0*Average seed
Northampton 2 Shrewsbury 0 -0.6
-0.5
Cheltenham 1 Aldershot 2 -0.2
Chesterfield 1 Bradford 1 +0.1
+0.0
Lincoln City 1 Bury 0 +0.1
Port Vale 2 Notts County 1 -0.1
-0.1
Morecambe 1 Dag & Red 0 -0.1
Week of 5/8100.0*Promoted100.0*Average seed
Port Vale 1 Shrewsbury 1 +0.1
Cheltenham 1 Accrington 1 +0.1
Points
Chance Will Win Championship