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*Average seed
Columbia 14 Harvard 21 +6.6
-0.7
+0.1
Dartmouth 10 Cornell 0 +6.2
-0.4
+0.1
Brown 10 Dartmouth 33 -3.9
-1.6
-0.1
Penn 38 Princeton 35 +1.8
+1.3
+0.1
Week of 11/11100.0*Chance wins title100.0*Top Half100.0*Average seed
Princeton 31 Yale 35 +24.0
Yes
+0.7
Harvard 6 Penn 23 +3.4
-0.3
+0.1
Cornell 8 Columbia 18 -0.2
If winner is:HomeAway
Week of 11/18100.0*Chance wins title100.0*Top Half100.0*Average seed
Yale vs HarvardYes-20.8
+0.2-0.2
Columbia vs Brown-8.3+8.3
-0.1+0.1
Dartmouth vs Princeton-8.3+8.3
-0.1+0.1

What If

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

100100100100100100100100
If finish:ChanceTopChance will finish season at seedLast
TPW-Lwins titleHalf12345678PlaceCount
121-0YesYes100No882,476,582
100-158.3%Yes58338No882,423,962
Total:79.2%Yes79174No1,764,900,544
Games Above .500
Chance Will Win Championship