How are these numbers calculated?

Big Games

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

Week of 10/12100.0*Chance in playoffs100.0*Supporters Shield100.0*Average seed
Timbers 1 Sounders 0 -0.5
-17.1
-0.7
Galaxy 1 Impact 0 -0.2
-0.1
-0.2
Sporting KC 1 DC United 0 -2.3
Impact 0 New England 1 +0.6
Week of 10/19100.0*Chance in playoffs100.0*Supporters Shield100.0*Average seed
Galaxy 0 Earthquakes 0 In
+0.2
FC Dallas 2 Sounders 0 -1.2
No
-0.6
Rapids 3 Whitecaps 2 -1.2
-0.1
Timbers 0 Real Salt Lake 0 +2.7
+0.2
Real Salt Lake 2 Chivas USA 1 -0.2
Week of 10/26100.0*Chance in playoffs100.0*Supporters Shield100.0*Average seed
Sounders 1 Galaxy 1 -0.4
Whitecaps 3 Rapids 0 +0.3
Chivas USA 0 Timbers 5 -0.1
Points
Chance Will Make Playoffs