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 +23.7
+1.2
San Antonio 1 St Louis 3 +6.5
+0.1
Swope Park 3 Tulsa 0 -6.3
-0.2
Salt Lake City 2 San Antonio 0 +3.5
+0.0
Arizona 1 Portland 2 -1.6
-0.1
Los Angeles 1 RGV 0 -1.3
-0.1
OKC 2 Seattle 2 +1.2
+0.0
RGV 0 Portland 1 -0.7
-0.1
Week of 9/17100.0*Chance in playoffs100.0*Average seed
Orange County 0 RGV 1 -26.3
-0.9
Arizona 3 Salt Lake City 2 +7.0
+0.2
San Antonio 2 Tulsa 0 -5.8
-0.2
Vancouver 0 Portland 2 -5.7
-0.3
Col Springs 2 Seattle 1 +3.6
+0.1
OKC 0 Swope Park 3 -2.5
-0.1
St Louis 1 Louisville 5 +0.4
+0.0
Week of 9/24100.0*Chance in playoffs100.0*Average seed
Orange County 4 Col Springs 0 +27.5
+1.0
RGV 3 San Antonio 0 +14.8
+0.3
Portland 3 Arizona 2 -10.5
-0.3
Los Angeles 3 Salt Lake City 1 +1.3
+0.2
Swope Park 2 Seattle 0 +0.1
Points
Chance Will Make Playoffs