A Glicko Sports Blog

A Glicko Sports Blog

Sun 18 Nov 2007

Polling analysis

The Sports Economist points us to a paper on how the NCAA-ball polls work. It demonstrates:

Contrary to conventional wisdom, I find that (1) it is better to lose later in the season than earlier, (2) AP voters do not pay attention to the strength of a defeated opponent, and (3) the benefit of winning by a large margin is negligible. I conclude by noting how these results inform debates about a potential playoff in college football.

How does Glickoblog reflect this? As followers have seen, the value of MICH's opening-day loss to Appalachian - as measured in the gap between MICH, which did not lose points, and MICH2, which did - had been scaled back from 91 to 45 points, prior to yesterday's game. On the other hand, a defeat yesterday for MICH against a side on 900 points (to be exact, the (899, 103) ranking of MDTEN) would have cost the side 53 ranking points. Other things being equal, it is slightly better for a decent side to get an embarrassing defeat out of the way early.

Margin of victory does not materially affect the voting. Nor does it affect Glickoblog rankings; see arguments passim.

The strength of a defeated opponent does not affect voting for the AP. It does for Glickoblog, but only while the ratings adjust to major shifts. To pick a bad example, GEOTC's opening-day win against NOTDM earned them 58 rating points, which we may reasonably halve through the passage of time. A win this week would have been worth just 17 points. This is a bad example because no-one quite knew just how abysmally rubbish NOTDM was at the beginning of the season: while they may not have been the 14th best side as we assumed, the consensus was that they were far closer to 14th than 70th. For NOTDM to fall, other sides have had to rise, and those sides that played the side early in the season will have been slightly over-rewarded. Similarly, those sides that lost early-season games to fast-rising sides like ARZST will be a smidge lower than they might otherwise be. More relevantly, OREGN's win in week 2 over MICH earned them 50 points; before this week's matches, it would be worth 26, no significant change.

For Glickoblog to address this perceived inconsistency, it would be necessary to recompute all rankings each time from the initial set. This is possible, and is an area we may explore in a future year.

A win over a good side is a win over a good side, but it seems that this factor is ignored by the human voters. Glickoblog awards lots of points for knocking off the number 1 side, as we saw last week. Losing to a strong opponent does help a team, and perhaps we might re-factor MICH's +0-2 start to the season as losses to the best side in I-AA last year (embarrassing, however you cut it) and the best side in the PX this (entirely reasonable for a BX contender).

On the field

The week began on Wednesday with this nationally-networked game:

Akron 0  vs. Miami (Ohio) 7

Mmm, gripping. Let's get the regular items out of the way early.

Who Have Notre Dame Lost To This Week?

 #113 Duke 7 vs. #68 Notre Dame 28

At the Top of Michigan's Beatpath

X- The Citadel 70 vs. VMI 28

The Citadel beat Elom beat Wofford beat App State beat Michigan beat Notre Dame beat Duke. So Citadel is six games better than Duke. Look at the rankings, this might be accurate.

Other lowly-ranked sides

 #107 Kent St. 14 vs. #110 Temple 24
 #117 Idaho 14 vs. #14 Boise St. 58
34- #118 Utah St. 35 vs. #109 New Mexico St. 17
 #103 Louisiana-Lafayette 38 vs. #119 Fla. International 28

Last year, Kent was excluded from the bowls only by the choice of the sponsors: they believed that a pisspoor Miamiflorida team would be more attractive. Temple is already out of contention for this year's games, but can look forward to something better next season. By losing by a mere ten points, this may be FLINT's best result of the year.

The bottom ten

LY   LW   TW          Conf    R      RD   Idle
====================================================================
111  108  110  UNLV    MW    731   104.9   0   Nevada, The Meadows
106  107  111  KENTS   MA    712   102.4   0   Kent State
79   112  112  SMU     CU    707    99.1   0   Southern Methodist
116  113  113  DUKE    AC    699   119.6   0   Duke
113  109  114  NMXST   WA    693   108.3   0   New Mexico Territory
104  114  115  UAB     CU    686   104.0   0   Alabama, Birmingham
110  116  116  NTEXS   SB    663   106.6   0   North Texas
114  118  117  UTHST   WA    637   111.5   0   Utah Territory
109  117  118  IDAHO   WA    614   111.8   0   Idaho
119  119  119  FLINT   SB    546   116.2   0   Florida International

We'll explain what happened to the other two escapers from the 110s later.

Last Week's Top Ten

 #1 LSU 41 vs. Mississippi 24
 #2 Ohio St. 14 vs. #9 Michigan 3
39- #3 Oklahoma 27 vs. #34 Texas Tech 34
      #4 Southern California - no game
 #5 West Virginia 28 vs. #27 Cincinnati 23
44- #6 Oregon 24 vs. Arizona 34
      #7 Texas - no game
 Miamiflorida 14 vs. #8 Virginia Tech 44
 #2 Ohio St. 14 vs. #9 Michigan 3
 Florida Atlantic 20 vs. #10 Florida 59

LSU gets a second straight victory against mediocre opposition, and it only adds three points to their total. The BX title game goes to OHIST, and it puts them right back into contention for the BCS title game, especially after defeats for OKLAH and OREGN. WVIRG won the first on its two games to decide the BE title, and suddenly enters into top-2 contention. Easy wins for VTECH and FLORD advance their claims by not hurting them.

Also in the top 40

 #25 Kentucky 13 vs. #12 Georgia 24
 Iowa St. 7 vs. #13 Kansas 45
 #15 Missouri 49 vs. Kansas St. 32
 #17 Boston College 20 vs. #20 Clemson 17
 Vanderbilt 24 vs. #18 Tennessee 25
 #24 Hawaii 28 vs. Nevada 26
 #30 Maryland 16 vs. #37 Florida St. 24

No game for #11 ARZST this week. The mess in the SE-E continues: Florida's win is joined by a difficult victory for GRGIA, and a trivial win for TENSE. Wins for both KANSS and MISRI, the sides in contention for the BT-N title. The AC-A goes to BOSCL, the AC-C will be decided next week after VTECH and VIRGI both won. HAWII continues to be unbeaten: if the title game were decided purely on won-loss record, the side would meet KANSS in the grand final.

The Upset-o-meter

46- #115 E. Michigan 48 vs. Cent. Michigan 45 44- #6 Oregon 24 vs. Arizona 34 42- #100 Louisiana-Monroe 21 vs. Alabama 14 41- W. Michigan 28 vs. Iowa 19 36- #18 Penn St. 31 vs. Michigan St. 35 34- #118 Utah St. 35 vs. #109 New Mexico St. 17 34- #111 Tulane 45 vs. Rice 31 32- #39 Purdue 24 vs. Indiana 27 30- San Jose St. 23 vs. Louisiana Tech 27

That's what happened to the sides in last week's bottom ten: they won games! EMICH's win is one of the biggest of the year, even larger an upset than OREGN's defeat. Defeat for near neighbours MICH ensures there will be much dancing in Depot Town this week.

Other inter-provincial matches

X- Harvard 37 vs. Yale 6
X- N. Carolina A&T 7 vs. S. Carolina St. 51
X- N. Dakota St. 24 vs. S. Dakota St. 29
X- Tenn.-Martin 43 vs. Tennessee St. 38
X- Montana 41 vs. Montana St. 20

The Top 30

LY   LW   TW          Conf    R      RD   Idle
====================================================================
 2    2    1   OHIST   BX   1395   110.8   0   Ohio Province
 4    1    2   LSU     SE   1382   111.9   0   Louisiana Purchase
10    5    3   WVIRG   BE   1335   112.3   0   W Virginia
 1    4    4   SCALF   PX   1329   110.8   1   Southern California
 5    7    5   TEXAS   BT   1297   106.8   1   Texas
11    8    6   VTECH   AC   1294   105.4   0   Virginia Tech
 9    3    7   OKLAH   BT   1284   105.7   0   Oklahoma
18   12    8   GRGIA   SE   1278   101.5   0   Georgia
 3   10    9   FLORD   SE   1273   105.1   0   Florida
38   15   10   MISRI   BT   1272    99.4   0   Missouri
36   11   11   ARZST   PX   1259    99.9   1   Arizona Province
19   17   12   BOSCL   AC   1259   105.6   0   Boston College
12    9   13   MICH    BX   1258   103.2   0   Michigan
53   13   14   KANSS   BT   1256    99.5   0   Kansas
32    6   15   OREGN   PX   1251   102.5   0   Oregon
 7   16   16   WISCO   BX   1249   105.6   0   Wisconsin
13   14   17   BSEST   WA   1248   104.8   0   Boise State
12   --   --   MICH2   BX   1217    99.9   0   Michigan 2
30   19   18   TENSE   SE   1209    98.1   0   Tennessee
21   21   19   BYU     MW   1201   104.4   0   Brigham Young
39   24   20   HAWII   WA   1192   116.2   0   Hawaii
15   23   21   CALIF   PX   1186   100.5   0   California
 8   22   22   AUBRN   SE   1180   107.0   1   Auburn
34   20   23   CLEMS   AC   1170   100.5   0   Clemson
27   28   24   ORGST   PX   1168    98.0   0   Oregon Territory
17   18   25   PENST   BX   1168   100.6   0   Penn Province
56   26   26   VIRGI   AC   1162    96.8   1   Virginia
24   34   27   TXSTC   BT   1155   100.3   0   Texas Tech
23   29   28   WAKEF   AC   1153    97.2   0   Wake Forest
54   25   29   KNTCY   SE   1143   104.1   0   Kentucky
44   27   30   CINCI   BE   1142   102.5   0   Cincinnati

Right, let's crunch the numbers for the BCS entrants. OHIST has finished, complete, kaput, will not budge from 1395. LSU has one relatively trivial game next week, then the SE title game against TENSE or GRGIA. Winning both will take LSU above 1400 points, and surely a place in the final. WVIRG has shot into contention with defeats for OREGN and OKLAH, but would really need LSU to lose their title game; a win against CONNC puts them on 1350. If SCALF wins the PX title, their history could count enough to put them into second; a win against ARZST lifts the side above 1350, but they've then got to beat UCLA. TEXAS is unlikely to make the BT title game. A +13-0 KANSS will rank very highly amongst the human voters. Sod easy schedules, this side has yet to taste defeat, let's put them in the top bracket. The AC champion is assured a place in the top ten, and there's still the chance of BSEST or HAWII crashing the party.

Calling the BCS bowls

Our gut feeling is:

Title game LSU - KANSS

Reserves OHIST, GRGIA, TENSE, in that order, depending on who wins their conferences. Obviously, not all can. Ranking the others is an academic exercise, because we have two certain winners (BX and SE), but we reckon it goes ARZST, OKLAH, OREGN, WVIRG, VTECH, MISRI, SCALF.

Wild cards Almost certain that the SE runner-up will get an invite. We still think two from the PX is likely, with OREGN probably getting a place if it wins out - for both SCALF and ARZST, it's win or bust next week. OKLAH and MISRI have credible shouts for the top ten even if they lose. VTECH may squeeze in if it loses the AC title game, though not if it loses to VIRGI next week. A +12-0 HAWII would get the last place; things would be easier if it lost, as BX cannot hope to claim two spots, and we can only see BE taking two if WVIRG loses and there's a mess in both PX and AC.

Conferences in detail

AC BOSCL has won the Atlantic, even if it loses to Miamiflorida. The Coastal will be decided by the meeting of VIRGI and VTECH.

BE WVIRG and CONNC meet to decide the title.

BT KANSS and MISRI meet to decide the North division. OKLAH need only beat OKLST to win the South; a defeat would allow TEXAS to take the division with a win.

BX OHIST has won, beating ILLNS and MICH by a game. All sides have now finished their seasons.

CU In the East, UCF has a one-game lead over MEMPH and ECARL; a three-way tie would resolve in favour of UCF, but they would lose a straight tie to ECARL. HOUST has finished its conference programme, but will lose top spot if TULSA wins.

MA Miami for the bowls! MIOHO has the East division won, and will play CMICH for the title.

MW Even with two divisional games left to play, BYU has this one in the bag.

PX It's ARZST's to lose, but if they can't beat SCALF, they would tend to lose. In this situation, OREGN wins if it can win its final divisional match. Note that all three sides have a later game - ARZST finishes against ARIZN, SCALF has UCLA, and OREGN's games are against UCLA and ORGST.

SE LSU has wrapped up the West. We're taking out a contract on ESPN's oh-so-inaccurate journalism, as it appears FLORD has finished its divisional activity, meaning that TENSE has it to lose in the East; we can hear the cheers for KNTCY from here. Bloody Mickey Mouse organisations.

SB TROY is a game clear of FLATL; the sides meet in two weeks.

WA Still boiling down to HAWII-BSEST.

XX NAVY for the bowls, nothing for the others but derision.

Television coverage

Th 1700 SB: Middle Tennessee -v- Troy (tape)
Fr 0100 PX: Southern California -v- Arizona Province
Fr 1700 BT: Nebraska -v- Colorado
Fr 2030 BT: Texas -v- Texas A and M
Sa 0200 WA: Boise State -v- Hawaii
Sa 1700        Match tbc
Sa 2030 PX: Oregon -v- UCLA
Su 0800 **: Florida Swamp -v- Florida (tape)
Su 1100 SE: Alabama -v- Auburn (tape)
Su 2230 CFL The Grey Cup Final

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