How are these numbers calculated?

Big Games

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

Week of 5/2100.0*Chance wins title100.0*Average seed
Real Betis 0 Barcelona 2 -12.0
-0.1
Atlético Madrid 1 Rayo Vallecano 0 +8.9
+0.2
Real Sociedad 0 Real Madrid 1 -3.2
-0.1
Week of 5/13None
Week of 5/15100.0*Chance wins title100.0*Average seed
Deportivo 0 Real Madrid 2 -0.3
Atlético Madrid 2 Celta de Vigo 0 +0.1
Points
Chance Will Win Championship