How are these numbers calculated?

Big Games

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

Week of 7/30100.0*Wooden Spoon100.0*Average seed
Canterbury 5 Dunedin 3 -15.7
+0.2
Canterbury 4 Dunedin 3 -8.3
+0.1
Week of 8/6100.0*Wooden Spoon100.0*Average seed
Dunedin 9 Auckland 2 +9.4
-0.1
Dunedin 0 Canterbury 5 -8.5
+0.1
Dunedin 3 Canterbury 1 +6.2
-0.1
Dunedin 1 Queenstown 3 -0.4
+0.0
Queenstown 7 Canterbury 4 +0.1
Week of 8/13100.0*Wooden Spoon100.0*Average seed
Dunedin 2 Canterbury 1 +38.2
-0.4
Auckland 5 Canterbury 4 +7.4
-0.1
Points
Chance Will Win Championship