How are these numbers calculated?

Big Games

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

Week of 4/26100.0*Chance in playoffs100.0*Average seed
Gurney 6 van Gerwen 6 In
-0.1
Smith 1 van Gerwen 7 In
+0.4
Wright 1 Smith 7 -0.1
Whitlock 7 Anderson 5 +0.1
van Barneveld 6 Cross 6 +0.0
Week of 5/3100.0*Chance in playoffs100.0*Average seed
Cross 2 van Gerwen 7 +0.1
Week of 5/10None
Games Above .500
Chance Will Make Playoffs