How are these numbers calculated?

Big Games

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

Week of 9/9100.0*Chance in playoffs100.0*Average seed
Arizona 1 Portland 2 Out
-1.1
San Antonio 1 St Louis 3 +1.1
-0.1
Salt Lake City 0 Orange County 2 -1.0
Swope Park 3 Tulsa 0 -0.5
-0.0
OKC 2 Seattle 2 -0.0
RGV 0 Portland 1 -0.2
Salt Lake City 2 San Antonio 0 -0.1
Week of 9/17100.0*Chance in playoffs100.0*Average seed
Arizona 3 Salt Lake City 2 +0.6
Vancouver 0 Portland 2 -0.2
St Louis 1 Louisville 5 +0.1
Col Springs 2 Seattle 1 +0.1
San Antonio 2 Tulsa 0 -0.0
Week of 9/24100.0*Chance in playoffs100.0*Average seed
Portland 3 Arizona 2 -0.6
OKC 2 St Louis 2 +0.2
Swope Park 2 Seattle 0 +0.2
Los Angeles 3 Salt Lake City 1 +0.1
Points
Chance Will Make Playoffs