J-70 Spring Open

# SchoolTeam A TOT
1 U. S. Coast Guard Academy U. S. Coast Guard Academy Bears 1 15 15
2 University of Rhode Island University of Rhode Island Rams 21 21
3 U. S. Coast Guard Academy U. S. Coast Guard Academy Bears 2 27 27
4 Tufts University Tufts University Jumbos 29 29
5 Roger Williams University Roger Williams University Hawks 36 36
6 U. S. Merchant Marine Academy U. S. Merchant Marine Academy Mariners 45 45
7 SUNY Maritime College SUNY Maritime College Privateers 51 51
SchoolTeam R1 R2 R3 R4 R5 R6 R7 R8 TOT
U. S. Coast Guard Academy U. S. Coast Guard Academy Bears 1 2 5 1 1 1 1 2 2 15
University of Rhode Island University of Rhode Island Rams 1 2 2 4 2 2 4 4 21
U. S. Coast Guard Academy U. S. Coast Guard Academy Bears 2 4 1 3 3 4 6 5 1 27
Tufts University Tufts University Jumbos 3 3 6 2 7 4 1 3 29
Roger Williams University Roger Williams University Hawks 5 4 4 6 3 5 3 6 36
U. S. Merchant Marine Academy U. S. Merchant Marine Academy Mariners 7 6 7 5 5 3 7 5 45
SUNY Maritime College SUNY Maritime College Privateers 6 7 5 7 6 7 6 7 51

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  7 boats · 8 races

FinSkipperSchool Races Rating
before
Perf.
rating
Δ Percentile
before → perf.
Surprise
(bits)
P(this good
or better)
Avg finish
actual / exp.
1Jesse McKnight '21U. S. Coast Guard Academy Bears 18/82.293.19+0.9099th → 99th2.08%1.9 / 3.1
2Zachary Champney '22University of Rhode Island8/81.762.59+0.8395th → 99th2.217%2.6 / 3.7
3Richard O'Leary '21U. S. Coast Guard Academy Bears 28/81.58u1.95+0.3891st → 99th0.528%3.4 / 4.0
4Ansgar Jordan '22Tufts University8/81.841.55−0.2897th → 91st0.355%3.6 / 3.6
5Alden Crowe '19Roger Williams University8/81.861.29−0.5797th → 86th1.481%4.5 / 3.6
6Neeko Helbich '21U. S. Merchant Marine Academy8/80.71u0.55−0.1658th → 53rd0.172%5.6 / 5.0
7Daniel Watkins '20SUNY Maritime College8/80.72u0.07−0.6560th → 19th1.294%6.4 / 5.0

Conditions — 04/20/2019 (8am–6pm)

🌧️Slight rain
Humidity 99%  ·  Pressure 1011.4 hPa

Temperature

59°F
↑ 60°F   ↓ 57°F
Feels like 55°F

Wind

● from   ▲ toward
13.2 kn
avg  ·  max 19.1 kn
Gusts to 40.6 kn
From S (175°)

Sky & Precipitation

Cloud cover100% Sunshine0.0 hrs Humidity99% Pressure1011.4 hPa Rain0.79 in

What this breeze does at Coast Guard — from fleet racing

Breeze: S about 14 kn (weather reanalysis in the scorer’s units)
In fleet races at Coast Guard in this breeze: a strongly favourites’ day (+0.14)
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 ±0.14 means a rating gap counts about 12% 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 →