Great Lakes IOR - J105 Division

# SchoolTeam A TOT
1 University of Wisconsin University of Wisconsin Badgers 15 15
2 U. S. Naval Academy U. S. Naval Academy Midshipmen 16 16
3 University of Chicago University of Chicago Maroons 19 19
4 University of Rhode Island University of Rhode Island Rams 20 20
5 Brown University Brown University Bears 22 22
6 College of Charleston College of Charleston Cougars 37 37
7 University of California at San Diego University of California at San Diego Tritons 39 39
8 University of Michigan University of Michigan Wolverines 48 48
SchoolTeam R1 R2 R3 R4 R5 R6 TOT
University of Wisconsin University of Wisconsin Badgers 3 2 4 3 1 2 15
U. S. Naval Academy U. S. Naval Academy Midshipmen 4 1 1 2 5 3 16
University of Chicago University of Chicago Maroons 2 5 2 5 4 1 19
University of Rhode Island University of Rhode Island Rams 1 3 5 4 2 5 20
Brown University Brown University Bears 7 4 3 1 3 4 22
College of Charleston College of Charleston Cougars 5 6 6 7 7 6 37
University of California at San Diego University of California at San Diego Tritons 6 7 7 6 6 7 39
University of Michigan University of Michigan Wolverines 8 8 8 8 8 8 48

Performance rating asks, for each skipper: holding every other boat fixed, which rating makes my actual race-by-race finishes least surprising? Boats are valued with the keelboat rating rather than the fleet rating: 0.41 × the skipper's fleet rating from the week before the event (unrated skippers start at 0.47); 0.28 × the mean fleet rating of the rated crew aboard; the skipper's own keelboat offset; the school's program effect. Non-finishes (OCS, DNF and similar) are left out of the fitting, as in the rating model.

Percentile places a rating among the 207 ICSA sailors with a keelboat rating who raced the discipline in the last three seasons. Surprise is how many bits more surprising the finishes were at the pre-event rating than at the performance rating. P(this good or better) simulates the event 3,000 times at the pre-event ratings, with the same regatta-form model as the fleet analysis pages, and reports how often the skipper would score this many points or fewer in the races they sailed.

The keelboat offsets are the current ones (the discipline files keep no weekly history), so a skipper's own offset has already seen this event; offsets are shrunk hard, so the effect is a few hundredths at most. Only skippers are rated.

  • u no fleet rating — the model's level for unrated skippers is the baseline.
  • — in the performance column: last in every race sailed, so no finite least-surprisal rating exists.

Division A  8 boats · 6 races

FinSkipperSchool Races Rating
before
Perf.
rating
Δ Percentile
before → perf.
Surprise
(bits)
P(this good
or better)
Avg finish
actual / exp.
1Seamus Hendrickson '25University of Wisconsin6/61.482.60+1.1289th → 99th2.914%2.5 / 4.0
2Colin Caraher '26U. S. Naval Academy6/61.182.45+1.2779th → 99th3.710%2.7 / 4.4
3Max Zhalilo '26University of Chicago6/61.262.11+0.8685th → 99th1.921%3.2 / 4.3
4Cooper Newton '26University of Rhode Island6/61.13u2.06+0.9378th → 99th2.221%3.3 / 4.5
5Daniel van Heeckeren '26Brown University6/61.531.63+0.1091st → 92nd0.047%3.7 / 3.9
6Truman Rogers '27College of Charleston6/61.93u0.29−1.6598th → 38th11.198%6.2 / 3.3
7Brendan O'Connor '27University of California at San Diego6/60.370.62+0.2542nd → 55th0.277%6.5 / 5.6
8River Servia '27University of Michigan6/60.01——17th → —6.3>99%8.0 / 6.0

Conditions — 09/21/2024 (8am–6pm)

☀️Clear sky
Humidity 49%  ·  Pressure 1012.4 hPa

Temperature

81°F
↑ 87°F   ↓ 69°F
Feels like 82°F

Wind

● from   ▲ toward
6.4 kn
avg  ·  max 8.7 kn
Gusts to 15.4 kn
From ESE (112°)

Sky & Precipitation

Cloud cover28% Sunshine11.0 hrs Humidity49% Pressure1012.4 hPa

What this breeze does at Chicago — from fleet racing

Breeze: E about 9 kn (weather reanalysis in the scorer’s units)
In fleet races at Chicago in this breeze: a favourites’ day (+0.04)
Favourites’ conditions: in fleet racing here the results follow the ratings more closely than usual, and the top seeds hold their places.

Orderliness is how tightly a fleet race’s finishing order follows the pre-regatta ratings, relative to a typical event (0): positive is the favourites’ day, negative the underdogs’. A value of ±0.04 means a rating gap counts about 3% more than on a typical day. This event is not a fleet race the rating model scores, so there is no actual value for it: this is what this venue’s fleet racing history says about the breeze on the day, read off the chart at the star. How this is estimated · compare venues.

Orderliness beyond the fleet at Chicago by wind direction (angle) and speed (rings), fitted surface; dots are labelled regatta-days, ★ this regatta (only 1 labelled days at Chicago, so the surface is mostly the all-venue pattern).

From the notes

Short write-ups of what the ratings and results show, with the numbers and how they were computed.

All notes →