2023 CGA J70 Invite #3

# SchoolTeam A TOT
1 U. S. Coast Guard Academy U. S. Coast Guard Academy Bears 1 37 37
2 University of Rhode Island University of Rhode Island Rams 38 38
3 Embry-Riddle University Embry-Riddle University Eagles 50 50
4 Tufts University Tufts University Jumbos 51 51
5 U. S. Coast Guard Academy U. S. Coast Guard Academy Bears 2 54 54
6 U. S. Merchant Marine Academy U. S. Merchant Marine Academy Mariners 79 79
7 University of Michigan University of Michigan Wolverines 96 96
8 The Citadel The Citadel Bulldogs 103 103
SchoolTeam R1 R2 R3 R4 R5 R6 R7 R8 R9 R10 R11 R12 R13 R14 TOT
U. S. Coast Guard Academy U. S. Coast Guard Academy Bears 1 4 1 1 5 3 4 4 3 1 3 5 1 1 1 37
University of Rhode Island University of Rhode Island Rams 3 3 4 1 2 1 3 2 6 1 1 6 2 3 38
Embry-Riddle University Embry-Riddle University Eagles 5 6 3 3 4 2 6 1 2 2 4 7 3 2 50
Tufts University Tufts University Jumbos 2 2 5 2 1 5 1 DSQ 3 6 3 2 5 5 51
U. S. Coast Guard Academy U. S. Coast Guard Academy Bears 2 1 4 2 4 5 3 5 4 4 RAF 2 3 4 4 54
U. S. Merchant Marine Academy U. S. Merchant Marine Academy Mariners 6 5 7 6 7 6 2 5 5 5 6 5 8 6 79
University of Michigan University of Michigan Wolverines 8 7 6 8 6 7 7 DSQ 8 4 8 4 7 7 96
The Citadel The Citadel Bulldogs 7 8 8 7 8 8 8 6 7 7 7 8 6 8 103

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.

Division A  8 boats · 14 races

FinSkipperSchool Races Rating
before
Perf.
rating
Δ Percentile
before → perf.
Surprise
(bits)
P(this good
or better)
Avg finish
actual / exp.
1Parker O'Sullivan '25U. S. Coast Guard Academy Bears 114/142.39u2.08−0.3299th → 99th0.651%2.6 / 2.7
2Iain Jaeger '23University of Rhode Island14/141.352.20+0.8687th → 99th3.97%2.7 / 4.2
3Mitchell Quinn '24Embry-Riddle University14/140.961.71+0.7573rd → 94th3.215%3.6 / 4.7
4Connor Rosow '24Tufts University14/141.521.78+0.2591st → 96th0.443%3.6 / 3.9
5Sean Sullivan '25U. S. Coast Guard Academy Bears 214/141.431.83+0.4088th → 97th1.046%3.9 / 4.1
6Caleb Keister '26U. S. Merchant Marine Academy Mariners8/140.700.68−0.0257th → 57th0.057%5.2 / 5.1
6Sunrae Sturmer '23U. S. Merchant Marine Academy Mariners6/140.780.44−0.3362nd → 45th0.483%6.2 / 5.0
7Samuel Stephens '25University of Michigan14/140.50-0.25−0.7549th → 7th3.293%6.9 / 5.4
8Henry Parker '26The Citadel14/140.01-0.94−0.9517th → 1st3.795%7.4 / 6.0

Conditions — 04/01/2023 (8am–6pm)

🌧️Slight rain
Humidity 99%  ·  Pressure 998.5 hPa

Temperature

53°F
↑ 55°F   ↓ 50°F
Feels like 48°F

Wind

● from   ▲ toward
12.5 kn
avg  ·  max 15.0 kn
Gusts to 32.3 kn
From SW (217°)

Sky & Precipitation

Cloud cover96% Sunshine0.4 hrs Humidity99% Pressure998.5 hPa Rain0.46 in

What this breeze does at Coast Guard — from fleet racing

Breeze: SW about 14 kn (weather reanalysis in the scorer’s units)
In fleet races at Coast Guard in this breeze: a favourites’ day (+0.09)
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 ±0.09 means a rating gap counts about 8% 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 Coast Guard by wind direction (angle) and speed (rings), fitted surface; dots are labelled regatta-days, ★ this regatta (57 labelled fleet-race days at Coast Guard).

From the notes

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

All notes →