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
Salt Lake City 0 Orange County 2 +27.2
+1.2
San Antonio 1 St Louis 3 +12.4
+0.2
Salt Lake City 2 San Antonio 0 +5.9
+0.1
Swope Park 3 Tulsa 0 -4.1
-0.1
Arizona 1 Portland 2 -1.6
-0.1
Los Angeles 1 RGV 0 -1.0
-0.1
RGV 0 Portland 1 -0.5
OKC 2 Seattle 2 +0.2
Week of 9/17100.0*Chance in playoffs100.0*Average seed
Orange County 0 RGV 1 -27.0
-0.8
Vancouver 0 Portland 2 -11.5
-0.4
Arizona 3 Salt Lake City 2 +5.7
+0.1
San Antonio 2 Tulsa 0 -3.4
-0.1
Col Springs 2 Seattle 1 +1.8
+0.1
OKC 0 Swope Park 3 -1.1
St Louis 1 Louisville 5 +0.2
Week of 9/24100.0*Chance in playoffs100.0*Average seed
Orange County 4 Col Springs 0 +29.4
+0.9
Portland 3 Arizona 2 -11.8
-0.2
RGV 3 San Antonio 0 +7.5
+0.2
Los Angeles 3 Salt Lake City 1 +0.7
+0.1
Swope Park 2 Seattle 0 +0.1
Points
Chance Will Make Playoffs