Sunday, March 17, 2019

NCAA Tournament 2019 Bracket Math for the MDS Model

Another year, another attempt to quantify the 9.2 quintillion outcomes of the NCAA tournament via my MDS ModelAs I did last year, I've generated a composite set of rankings similar to what I used to sportsbet in Las Vegas. 

I'm taking a composite of 4 different models, similar to what FiveThirtyEight does, and the same technique as last year: 
  • FiveThirtyEight (so I'm including a composite of a composite)
  • KenPom (who's ratings are also included in FiveThirtyEight, so they're counted twice)
  • Powerrank (created and maintained by Ed Feng)
  • Massey Composite (another composite, this time spanning 68 rating systems)
I then use a weighted average of these 4 ratings that reduces outliers by weighting the ratings closer to the median higher. This smooths out the final Aggregate ratings that I then use to project the tournament. That being said, I have a good deal of trust in all of the above rating systems, so I wouldn't expect anything too crazy outlier-wise.

Note: For simplicity, I've taken the highest rated team in each play-in game and included them.


SeedTeam1st Round2nd RoundSweet 16Elite 8Final FourChampionshipChampion
East
1Duke100.00%98.28%80.11%58.13%37.81%23.02%13.77%
16*North Dakota St.100.00%1.72%0.19%0.01%0.00%0.00%0.00%
8VCU100.00%52.72%10.84%4.40%1.45%0.42%0.12%
9UCF100.00%47.28%8.86%3.37%1.03%0.27%0.07%
5Mississippi St.100.00%71.93%35.26%11.71%4.84%1.79%0.64%
12Liberty100.00%28.07%7.99%1.33%0.29%0.05%0.01%
4Virginia Tech100.00%82.67%51.90%20.43%9.82%4.27%1.81%
13Saint Louis100.00%17.33%4.85%0.62%0.11%0.02%0.00%
6Maryland100.00%63.24%33.30%12.12%4.21%1.50%0.52%
11*Belmont100.00%36.76%14.67%3.69%0.88%0.21%0.05%
3LSU100.00%77.18%45.15%17.98%6.85%2.67%1.01%
14Yale100.00%22.82%6.88%1.15%0.18%0.03%0.00%
7Louisville100.00%63.56%21.80%11.86%4.39%1.66%0.61%
10Minnesota100.00%36.44%8.49%3.48%0.89%0.23%0.06%
2Michigan St.100.00%95.13%68.98%49.62%27.24%15.29%8.42%
15Bradley100.00%4.87%0.73%0.11%0.01%0.00%0.00%
West
1Gonzaga100.00%98.16%77.94%56.95%36.19%20.95%12.22%
16*Fairleigh Dickinson100.00%1.84%0.19%0.01%0.00%0.00%0.00%
8Syracuse100.00%52.65%11.98%5.26%1.77%0.51%0.15%
9Baylor100.00%47.35%9.89%4.09%1.28%0.34%0.09%
5Marquette100.00%61.83%29.61%9.60%3.69%1.23%0.41%
12Murray St.100.00%38.17%14.01%3.23%0.90%0.21%0.05%
4Florida St.100.00%77.73%48.91%19.61%9.17%3.78%1.57%
13Vermont100.00%22.27%7.47%1.25%0.26%0.04%0.01%
6Buffalo100.00%67.41%30.14%12.68%4.93%1.80%0.66%
11*Arizona St.100.00%32.59%9.45%2.49%0.60%0.13%0.03%
3Texas Tech100.00%85.61%56.58%29.81%14.67%6.89%3.26%
14Northern Kentucky100.00%14.39%3.83%0.65%0.10%0.01%0.00%
7Nevada100.00%55.72%20.65%9.27%3.46%1.21%0.43%
10Florida100.00%44.28%14.23%5.62%1.82%0.55%0.17%
2Michigan100.00%91.50%63.47%39.22%21.13%10.91%5.68%
15Montana100.00%8.50%1.65%0.26%0.03%0.00%0.00%
South
1Virginia100.00%97.08%79.91%60.52%41.42%27.37%16.33%
16Gardner Webb100.00%2.92%0.49%0.06%0.01%0.00%0.00%
8Ole Miss100.00%47.66%8.96%3.62%1.18%0.36%0.09%
9Oklahoma100.00%52.34%10.64%4.54%1.58%0.51%0.13%
5Wisconsin100.00%65.06%39.24%14.18%6.74%3.03%1.16%
12Oregon100.00%34.94%15.92%3.80%1.26%0.39%0.10%
4Kansas St.100.00%73.61%37.56%12.18%5.29%2.16%0.74%
13UC Irvine100.00%26.39%7.28%1.10%0.24%0.05%0.01%
6Villanova100.00%59.52%27.21%11.61%4.07%1.62%0.54%
11Saint Mary's100.00%40.48%14.96%5.08%1.38%0.43%0.11%
3Purdue100.00%83.84%53.53%28.10%12.47%6.21%2.67%
14Old Dominion100.00%16.16%4.29%0.82%0.12%0.02%0.00%
7Cincinnati100.00%53.51%18.09%7.55%2.30%0.80%0.23%
10Iowa100.00%46.49%14.36%5.52%1.52%0.48%0.12%
2Tennessee100.00%90.71%65.40%40.95%20.39%11.31%5.50%
15Colgate100.00%9.29%2.15%0.36%0.04%0.00%0.00%
Midwest
1North Carolina100.00%97.40%75.57%51.86%32.56%17.61%9.22%
16Iona100.00%2.60%0.31%0.02%0.00%0.00%0.00%
8Utah St.100.00%52.59%13.17%5.41%1.90%0.53%0.14%
9Washington100.00%47.41%10.96%4.24%1.39%0.36%0.09%
5Auburn100.00%69.60%40.97%17.73%8.70%3.53%1.36%
12New Mexico St.100.00%30.40%11.99%3.08%0.93%0.22%0.05%
4Kansas100.00%75.14%40.04%16.31%7.56%2.87%1.04%
13Northeastern100.00%24.86%7.01%1.34%0.30%0.05%0.01%
6Iowa St.100.00%63.22%33.30%15.04%6.44%2.44%0.87%
11Ohio St.100.00%36.78%14.74%4.84%1.49%0.39%0.10%
3Houston100.00%82.63%47.90%23.09%10.59%4.31%1.67%
14Georgia St.100.00%17.37%4.06%0.70%0.11%0.01%0.00%
7Wofford100.00%61.22%22.60%10.62%4.08%1.37%0.43%
10Seton Hall100.00%38.78%10.64%3.85%1.10%0.27%0.06%
2Kentucky100.00%92.90%65.48%41.68%22.84%11.31%5.40%
15Abilene Christian100.00%7.10%1.28%0.18%0.02%0.00%0.00%

Some quick reactions:


  • North Carolina seems to have the toughest route, but also has the lowest rating in my model of the 1 seeds. These two combined factors result in the lowest probability of the 1 seeds of reaching the Final Four (32.56%)
  • Of course Virginia has the lowest chance of winning their first game out of all the 1 seeds (97.08%)!
  • The fan base that has the best right to complain is Michigan St: they're #4 overall, yet get #2 Duke in the Elite Eight, and only have a 27.24% chance of reaching Minneapolis
The top 12 teams in the tournament are as follows:


RankTeamRating
1Virginia95.38
2Duke94.78
3Gonzaga94.23
4Michigan St.93.03
5North Carolina92.71
6Michigan91.94
7Tennessee91.40
8Kentucky91.05
9Texas Tech90.22
10Purdue89.35
11Virginia Tech88.43
12Florida St.88.10

5 of these top 12 are ACC, which is a real testament to the strength of the conference. The Big 10 has 3, the SEC has 2, and the Big 12 only has 1.


A word of caution about straight up copying the above: in most pools you want to gauge "contrarian" picks relative to the overall poolMy suggestion would be to use the above probabilities as a guide ("I'm just a guide"), and make contrarian picks that have a good chance of happening (like picking a champion that has solid odds but isn't necessarily the favorite).

Here's the full rating set as well:


RankTeamRating
1Virginia95.38
2Duke94.78
3Gonzaga94.23
4Michigan St.93.03
5North Carolina92.71
6Michigan91.94
7Tennessee91.40
8Kentucky91.05
9Texas Tech90.22
10Purdue89.35
11Virginia Tech88.43
12Florida St.88.10
13Houston87.78
14Auburn87.71
15Wisconsin87.60
16LSU86.75
17Kansas86.74
18Iowa St.86.67
19Buffalo86.34
20Louisville86.33
21Kansas St.86.09
22Mississippi St.85.97
23Nevada85.74
24Villanova85.73
25Maryland85.44
26Marquette85.05
27Wofford85.00
28Cincinnati83.79
29Florida83.74
30Syracuse83.22
31Oklahoma82.83
32VCU82.72
33Utah St.82.56
34Iowa82.56
35Saint Mary's82.37
36Baylor82.29
37Oregon82.21
38Ole Miss82.01
39Ohio St.81.96
40UCF81.76
41Washington81.65
42Minnesota81.49
43Seton Hall81.03
44Murray St.80.85
45Belmont80.72
46New Mexico St.80.56
47Arizona St.80.04
48Temple78.76
49St. John's78.16
50Liberty77.87
51Vermont77.46
52UC Irvine77.28
53Northeastern77.28
54Yale76.36
55Old Dominion75.57
56Northern Kentucky75.39
57Saint Louis75.30
58Georgia St.74.67
59Colgate72.94
60Montana72.79
61Abilene Christian70.56
62Bradley69.91
63Gardner Webb68.98
64Iona65.61
65North Dakota St.65.26
66Fairleigh Dickinson65.10
67Prairie View A&M65.01
68North Carolina Central57.12

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