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*Segunda Division100.0*Average seed
Deportivo 0 Getafe 2 -20.0
+0.7
Granada 3 Las Palmas 2 +8.1
-0.2
Atlético Madrid 1 Rayo Vallecano 0 -3.0
+0.1
Sporting Gijón 2 Eibar 0 +2.9
-0.1
Espanyol 1 Sevilla 0 +1.2
-0.1
Málaga 3 Levante 1 -1.1
+0.1
Week of 5/13None
Week of 5/15100.0*Segunda Division100.0*Average seed
Real Betis 2 Getafe 1 +38.3
-0.6
Rayo Vallecano 3 Levante 1 +14.7
-0.3
Sporting Gijón 2 Villarreal 0 +14.7
-0.3
Points
Chance Will Win Championship