NWICSA Match Race

# SchoolTeam A TOT
1 University of British Columbia University of British Columbia UBC Thunderbirds SC 1 1
2 University of Washington University of Washington Huskies 2 2
3 Oregon State University Oregon State University Beavers 3 3
4 Western Washington University Western Washington University Vikings 4 4
SchoolTeam R1 TOT
University of British Columbia University of British Columbia UBC Thunderbirds SC 1 1
University of Washington University of Washington Huskies 2 2
Oregon State University Oregon State University Beavers 3 3
Western Washington University Western Washington University Vikings 4 4

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.

  • — in the performance column: last in every race sailed, so no finite least-surprisal rating exists.

Division A  4 boats · 1 races

FinSkipperSchool Races Rating
before
Perf.
rating
Δ Percentile
before → perf.
Surprise
(bits)
P(this good
or better)
Avg finish
actual / exp.
1Joseph Gustafson '18University of British Columbia1/10.797.00++6.2164th → 99th2.323%1.0 / 2.6
2Connor Hughes '19University of Washington1/11.381.78+0.4088th → 96th0.161%2.0 / 2.2
3Michael Levy '19Oregon State University1/10.980.86−0.1373rd → 68th0.075%3.0 / 2.5
4Ezekiel Ward '20Western Washington University1/10.82——66th → —1.6>99%4.0 / 2.6

Conditions — 09/30/2017 (8am–6pm)

🌦️Light drizzle
Humidity 73%  ·  Pressure 1020.6 hPa

Temperature

59°F
↑ 65°F   ↓ 52°F
Feels like 57°F

Wind

● from   ▲ toward
4.3 kn
avg  ·  max 7.0 kn
Gusts to 16.1 kn
From SW (214°)

Sky & Precipitation

Cloud cover53% Sunshine10.1 hrs Humidity73% Pressure1020.6 hPa Rain0.05 in

What this breeze does at British Columbia — from fleet racing

Breeze: SW about 7 kn (weather reanalysis in the scorer’s units)
In fleet races at British Columbia in this breeze: a favourites’ day (+0.05)
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 ±0.05 means a rating gap counts about 4% 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 British Columbia by wind direction (angle) and speed (rings), fitted surface; dots are labelled regatta-days, ★ this regatta (only 2 labelled days at British Columbia, 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 →