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 Sociedad 0 Real Madrid 1 +8.7
+0.2
Real Betis 0 Barcelona 2 -4.2
-0.1
Atlético Madrid 1 Rayo Vallecano 0 -3.4
-0.1
Week of 5/13None
Week of 5/15100.0*Chance wins title100.0*Average seed
Granada 0 Barcelona 3 No
-0.2
Deportivo 0 Real Madrid 2 +14.8
+0.4
Atlético Madrid 2 Celta de Vigo 0 -0.1
Points
Chance Will Win Championship