How are these numbers calculated?

Big Games

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

Week of 8/14100.0*Chance in playoffs100.0*Home Advantage100.0*Average seed
Southern 2 Dunedin 13 -7.9
No
-0.5
Southern 3 Dunedin 4 (ot)Out
-0.6
West Auckland 6 Canterbury 5 Out
West Auckland 8 Canterbury 7 (ot)+1.2
-0.1
Southern 2 Botany 4 -0.3
Week of 8/21100.0*Chance in playoffs100.0*Home Advantage100.0*Average seed
Canterbury 13 Dunedin 7 +0.5
Canterbury 9 Dunedin 1 +0.1
Southern 2 Botany 1 (so)+0.1
Points
Chance Will Make Playoffs