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 -20.9
-15.5
-0.9
Penn 38 Princeton 35 +2.5
+1.7
+0.1
Dartmouth 10 Cornell 0 +2.1
-1.9
Brown 10 Dartmouth 33 -0.2
-1.4
-0.1
Week of 11/11100.0*Chance wins title100.0*Top Half100.0*Average seed
Princeton 31 Yale 35 -19.4
+0.7
-0.2
Cornell 8 Columbia 18 +14.3
+24.0
+1.3
Harvard 6 Penn 23 +1.1
+4.0
+0.1
If winner is:HomeAway
Week of 11/18100.0*Chance wins title100.0*Top Half100.0*Average seed
Yale vs HarvardNo+29.7
Yes-2.7
-0.1+0.3
Columbia vs Brown+1.0No
Yes-5.0
+0.1-1.1
Dartmouth vs Princeton-1.5+1.4
-0.1+0.1
-0.3+0.2

What If

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

100100100100100100100100
If finish:ChanceTopChance will finish season at seedLast
TPW-Lwins titleHalf12345678PlaceCount
101-08.2%Yes86923No4,936,365,885
80-1No94.3%1639396No656,780,547
Total:7.2%99.3%7632551No5,593,146,432
Games Above .500
Chance Will Win Championship