Tuesday, March 23, 2010

Sweet Sixteen Log5 Table

Using the latest Relative Ratings, I decided to run one million simulations of the tournament starting at the Sweet 16. Below is a Log5 table displaying the results. The win odds are similar to the Vegas odds, though my ratings result in Duke being the favorite, whereas Vegas has Kentucky as the favorite at 3 to 1 odds.

Team S16 E8 F4 NC Win
Northern Iowa 100.0% 48.4% 17.1% 5.2% 1.3%
Michigan St 100.0% 51.6% 19.0% 6.1% 1.6%
Tennessee 100.0% 32.8% 17.3% 5.8% 1.6%
Ohio St 100.0% 67.2% 46.7% 23.4% 10.0%
Syracuse 100.0% 73.5% 47.6% 32.1% 16.1%
Butler 100.0% 26.5% 10.7% 4.7% 1.3%
Xavier 100.0% 36.8% 12.4% 5.6% 1.7%
Kansas St 100.0% 63.2% 29.3% 17.0% 6.9%
Kentucky 100.0% 79.7% 49.7% 21.8% 12.2%
Cornell 100.0% 20.3% 6.2% 1.1% 0.3%
Washington 100.0% 32.9% 11.0% 2.7% 0.9%
West Virginia 100.0% 67.1% 33.1% 12.5% 6.1%
Duke 100.0% 78.8% 63.0% 46.1% 33.4%
Purdue 100.0% 21.2% 11.1% 4.8% 2.0%
Baylor 100.0% 63.2% 18.6% 8.5% 3.8%
St Mary's CA 100.0% 36.8% 7.4% 2.5% 0.8%

Sunday, March 7, 2010

Bracketology: A First Attempt at Seedings (updated March 14th)

First some admissions: these seedings are based on a mixture of statistics, some of which the committee members use and some they probably do not. The result is that this bracket doesn't completely resemble others drifting around out there in the internet ether. However, one important statistic I use is predictive in nature, which means it is pretty good at guessing what will happen. So these seedings may not match what they would be if the season ended today, but are probably closer to what they will be when the conference tournament season is over. Still with me? Anyway, I have not applied bracket logic to these, so some of the lower seeds may be a spot off from what you may expect. Additionally, injuries have not been taken into account, which most notably affects Ohio St and Purdue. I have begun to make manual procedural bumps to more accurately reflect what I see as the likely seedings. Initially I wanted this to be a purely mathematical model, but then I decided that accounting for player injuries would be extremely difficult (I'd have to track injuries for every team who was in contention for an at large bid, discount the stats from that period a certain percentage based on that player's lost production, etc). I felt that a few manual seed changes were within the spirit of the exercise.

Updated through games of March 13th.

1. Kansas, Kentucky, Syracuse, Duke
2. West Virginia, Kansas St, Ohio St, Georgetown
3. Baylor, Villanova, Pittsburgh, Purdue
4. Wisconsin, New Mexico, Temple, Butler
5. Tennessee, Vanderbilt, Michigan St, BYU
6. Maryland, Texas A&M, Xavier, Richmond
7. Northern Iowa, California, Gonzaga, Marquette
8. Oklahoma St, Florida St, Notre Dame, Texas
9. UTEP, Clemson, UNLV, Louisville
10. St Mary's CA, Missouri, Utah St, Georgia Tech
11. Washington, Siena, San Diego St, Old Dominion
12. Cornell, Mississippi St, Wake Forest, Virginia Tech
13. Murray St, Wofford, New Mexico St, Sam Houston St
14. Oakland, Houston, Ohio, Montana
15. Vermont, Santa Barbara, North Texas, Morgan St
16. ETSU, Robert Morris, Lehigh, Winthrop, Ark Pine Bluff

Last Four In: San Diego St, Mississippi St, Wake Forest, Virginia Tech
Last Four Out: Minnesota, Arizona St, Memphis, Florida

Sunday Housekeeping

I have decided that instead of creating a new post each time I want to update the rankings, every morning I will update the March 4th post with the current relative rating rankings and the March 6th post with the current SAWP rankings.

Also look for a Bracketology post in the next few days, which will also be updated daily in the same manner as described above.

Saturday, March 6, 2010

Sooner Rather Than Later

Since I posted the Top 50 rankings for the Relative Ratings a few days ago, I figured maybe I should post the Top 50 SAWP rankings. As a reminder, the SAWP rating only uses win/loss and location as inputs, which is similar to the RPI. SAWP will typically correlate much closer to the human polls than will the Relative Ratings.

I am not a big fan of win/loss rating systems, because although they are a reasonable zero-sum look at what happened, they aren't typically helpful in identifying what will happen. And in the end, isn't that what the NCAA tournament committee's job is? They have a product to sell, after all, and the best product should consist of the best 64 games. If RPI isn't a good indicator of what will happen, then why is it one of the main factors in determining which teams make the tournament? And now off the soapbox, I'll post the rankings.

Updated through games of March 12th

Top 50 Conf W-L SAWP RPI/Rnk SOS/Rnk
1. Kansas B12 31-2 .7535 .665 / 1 .584 / 18
2. Kentucky SEC 30-2 .7331 .644 / 4 .543 / 78
3. Syracuse BE 28-4 .7256 .650 / 2 .585 / 17
4. West Virginia BE 26-6 .7072 .644 / 3 .603 / 6
5. Duke ACC 27-5 .7069 .640 / 6 .583 / 19
6. Purdue B10 27-4 .7026 .621 / 9 .536 / 92
7. Kansas St B12 25-6 .6991 .642 / 5 .610 / 3
8. New Mexico MWC 29-4 .6990 .617 / 11 .526 / 114
9. Northern Iowa MVC 28-4 .6898 .602 / 23 .501 / 164
10. Temple A10 27-5 .6895 .611 / 15 .531 / 104
11. Butler HL 28-4 .6879 .611 / 16 .527 / 111
12. Baylor B12 24-7 .6811 .622 / 8 .582 / 21
13. Villanova BE 24-7 .6807 .617 / 12 .564 / 43
14. Tennessee SEC 25-7 .6784 .616 / 14 .568 / 40
15. BYU MWC 28-5 .6774 .598 / 24 .504 / 157
16. Georgetown BE 23-9 .6738 .632 / 7 .632 / 1
17. Pittsburgh BE 24-8 .6737 .620 / 10 .589 / 13
18. Vanderbilt SEC 23-7 .6721 .611 / 17 .566 / 41
19. UTEP CUSA 26-5 .6703 .594 / 29 .510 / 140
20. Xavier A10 24-7 .6694 .604 / 21 .547 / 70
21. Ohio St B10 25-7 .6656 .594 / 28 .530 / 107
22. Utah St WAC 26-6 .6644 .590 / 32 .520 / 121
23. St Mary's CA WCC 25-5 .6615 .590 / 33 .506 / 152
24. Richmond A10 25-7 .6603 .593 / 31 .531 / 101
25. Maryland ACC 22-8 .6602 .606 / 18 .575 / 30
26. Gonzaga WCC 25-6 .6596 .585 / 40 .506 / 150
27. Cornell Ivy 25-4 .6590 .568 / 59 .459 / 271
28. Texas A&M B12 22-9 .6563 .616 / 13 .606 / 5
29. Wisconsin B10 23-8 .6546 .606 / 19 .575 / 31
30. UNLV MWC 24-7 .6543 .586 / 38 .516 / 128
31. Siena MAAC 27-6 .6537 .580 / 46 .496 / 177
32. Murray St OVC 28-4 .6524 .553 / 76 .425 / 318
33. Michigan St B10 24-8 .6522 .596 / 25 .549 / 65
34. Texas B12 24-9 .6490 .595 / 26 .549 / 66
35. San Diego St MWC 22-8 .6460 .586 / 39 .542 / 79
36. Old Dominion CAA 26-8 .6455 .585 / 41 .531 / 100
37. California P10 23-9 .6448 .605 / 20 .589 / 14
38. Oklahoma St B12 22-10 .6392 .595 / 27 .576 / 28
39. Rhode Island A10 23-8 .6376 .584 / 43 .533 / 98
40. Notre Dame BE 23-11 .6367 .587 / 37 .561 / 49
41. Florida St ACC 22-9 .6356 .588 / 35 .553 / 62
42. Virginia Tech ACC 23-8 .6351 .567 / 60 .494 / 184
43. Louisville BE 20-11 .6346 .602 / 22 .610 / 4
44. Marquette BE 22-11 .6344 .583 / 44 .558 / 53
45. Missouri B12 22-10 .6341 .584 / 42 .552 / 63
46. Washington P10 23-9 .6325 .580 / 45 .532 / 99
47. Clemson ACC 21-10 .6323 .593 / 30 .579 / 24
48. UAB CUSA 23-8 .6304 .579 / 48 .530 / 106
49. Wichita St MVC 24-9 .6285 .572 / 55 .519 / 123
50. Wofford SC 25-8 .6265 .545 / 86 .459 / 269

Notes: The RPI rating shown may not precisely equal other sources. It is close enough that I am comfortable in providing it simply as a comparator to SAWP.

Thursday, March 4, 2010

A Return to March Madness

As my readership is extremely small to non-existent, I have failed to keep consistent with my posting. However, with March here and college basketball entering the conference tournament season, I wanted to post my Top 25 Top 50 rankings which are based on my week adjusted relative ratings.

Updated through games of March 21st

Top 50
Conf W-L Pyth AdjO/Rnk AdjD/Rnk
1. Duke ACC 31-5 .9813 80.4 / 3 58.6 / 1
2. Kansas B12 33-3 .9808 82.2 / 1 60 / 4
3. Syracuse BE 30-4 .9675 81 / 2 61.7 / 16
4. Kentucky SEC 34-2 .9612 79.6 / 5 61.6 / 14
5. Ohio St B10 29-7 .9553 76.7 / 17 60.1 / 5
6. BYU MWC 29-6 .9526 79.6 / 6 62.6 / 26
7. Kansas St B12 27-7 .9513 79.8 / 4 62.9 / 32
8. West Virginia BE 29-6 .9488 77 / 15 60.9 / 10
9. Wisconsin B10 24-9 .9481 74.2 / 45 58.8 / 2
10. Baylor B12 26-7 .9399 78 / 10 62.6 / 25
11. Maryland ACC 23-9 .9384 78.7 / 8 63.3 / 40
12. Texas B12 24-10 .9355 79.1 / 7 63.8 / 50
13. Missouri B12 23-11 .9340 77.4 / 11 62.6 / 27
14. Purdue B10 29-5 .9338 75.1 / 32 60.8 / 8
15. Georgetown BE 23-11 .9277 76.5 / 18 62.4 / 23
16. Utah St WAC 26-8 .9271 75.1 / 30 61.3 / 13
17. Clemson ACC 21-11 .9247 75.9 / 24 62.1 / 21
18. California P10 24-11 .9223 77.1 / 14 63.2 / 38
19. Xavier A10 26-8 .9193 77.3 / 13 63.6 / 47
20. Butler HL 30-4 .9152 73.9 / 56 61.1 / 12
21. Florida St ACC 22-10 .9134 73.6 / 58 60.9 / 9
22. Texas A&M B12 23-10 .9132 74.9 / 38 62 / 20
23. Tennessee SEC 27-8 .9128 75.7 / 25 62.7 / 29
24. Villanova BE 25-8 .9096 78.6 / 9 65.3 / 84
25. Minnesota B10 21-14 .9091 75 / 37 62.3 / 22
26. Michigan St B10 26-8 .9067 75.1 / 31 62.6 / 28
27. Old Dominion CAA 27-9 .9028 72.3 / 74 60.5 / 7
28. Pittsburgh BE 25-9 .9015 73.7 / 57 61.8 / 17
29. St Mary's CA WCC 27-5 .9012 76.3 / 20 63.9 / 53
30. Washington P10 26-9 .9010 77.4 / 12 64.8 / 71
31. Northern Iowa MVC 30-4 .9007 71 / 99 59.5 / 3
32. Temple A10 29-6 .9000 71.7 / 83 60.2 / 6
33. UTEP CUSA 26-7 .8988 75.5 / 26 63.4 / 42
34. Marquette BE 22-12 .8982 75.1 / 33 63.1 / 34
35. Vanderbilt SEC 23-9 .8960 76.8 / 16 64.6 / 65
36. Georgia Tech ACC 22-13 .8955 75 / 35 63.1 / 36
37. Murray St OVC 29-5 .8896 74.3 / 44 62.9 / 31
38. Memphis CUSA 24-10 .8848 75.2 / 29 63.9 / 52
39. Virginia Tech ACC 24-8 .8832 74.7 / 40 63.5 / 44
40. Arizona St P10 22-11 .8829 71.6 / 85 61 / 11
41. UNLV MWC 24-9 .8793 74 / 51 63.1 / 37
42. Dayton A10 21-12 .8785 73.3 / 61 62.6 / 24
43. Louisville BE 20-13 .8767 76.1 / 22 65 / 74
44. Mississippi SEC 23-10 .8765 76.4 / 19 65.3 / 83
45. Mississippi St SEC 24-12 .8760 74.2 / 47 63.5 / 43
46. New Mexico MWC 30-5 .8717 75 / 34 64.3 / 62
47. Oklahoma St B12 22-11 .8628 74.8 / 39 64.6 / 64
48. Cornell Ivy 27-4 .8628 74 / 52 63.9 / 51
49. Florida SEC 21-13 .8618 74.2 / 46 64.1 / 58
50. San Diego St MWC 23-9 .8603 72.6 / 70 62.8 / 30

Note: Teams highlighted in red remain active in the NCAA tournament