How are these numbers calculated?

Big Games

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

Week of 11/4100.0*Chance wins title100.0*Top Half100.0*Last Place100.0*Average seed
Columbia 14 Harvard 21 +2.6
+20.5
No
+0.8
Penn 38 Princeton 35 +0.4
+2.9
Dartmouth 10 Cornell 0 +0.3
-0.8
-0.1
Brown 10 Dartmouth 33 -0.2
-1.5
-0.1
Week of 11/11100.0*Chance wins title100.0*Top Half100.0*Last Place100.0*Average seed
Harvard 6 Penn 23 -5.0
-32.7
-1.1
Cornell 8 Columbia 18 -0.8
+2.4
Princeton 31 Yale 35 No
-0.3
+0.2
If winner is:HomeAway
Week of 11/18100.0*Chance wins title100.0*Top Half100.0*Last Place100.0*Average seed
Yale vs HarvardNo+48.2
-0.3+1.3
Dartmouth vs Princeton-1.6+1.5
+0.2-0.1
Columbia vs Brown-0.3+2.1
-0.0+0.1

What If

Chances based on how well the Harvard finish out the regular season.   Explain

100100100100100100100100
If finish:ChanceTopChance will finish season at seedLast
TPW-Lwins titleHalf12345678PlaceCount
81-0No60.0%2184040No1,097,291,571
60-1NoNo414117No4,495,854,861
Total:No11.8%048413314No5,593,146,432
Games Above .500
Chance Will Win Championship