SAISA Match Race Championships

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  8 boats · 1 races

FinSkipperSchool Races Rating
before
Perf.
rating
Δ Percentile
before → perf.
Surprise
(bits)
P(this good
or better)
Avg finish
actual / exp.
1Axel Stordahl '24College of Charleston1/12.727.00++4.2899th → 99th1.632%1.0 / 2.8
2Matthew King '24Jacksonville University1/11.923.44+1.5298th → 99th0.829%2.0 / 3.9
3Atlee Kohl '25University of Miami1/12.332.39+0.0699th → 99th0.057%3.0 / 3.4
4Robert Chase '26North Carolina State University1/11.082.00+0.9277th → 99th0.438%4.0 / 5.1
5Brendan Smucker '25Florida Institute of Technology1/11.051.47+0.4176th → 89th0.153%5.0 / 5.1
6Andreas Keswater '24University of South Florida1/11.600.72−0.8891st → 60th0.581%6.0 / 4.4
7Andrew Simpson '27University of North Carolina at Wilmington1/10.710.31−0.3958th → 39th0.178%7.0 / 5.5
8Zechariah Frantz '25Embry-Riddle University1/10.44——45th → —1.7>99%8.0 / 5.9

Conditions — 09/23/2023 (8am–6pm)

☁️Overcast
Humidity 60%  ·  Pressure 1010.1 hPa

Temperature

73°F
↑ 78°F   ↓ 66°F
Feels like 71°F

Wind

● from   ▲ toward
10.2 kn
avg  ·  max 13.4 kn
Gusts to 23.1 kn
From NW (315°)

Sky & Precipitation

Cloud cover87% Sunshine5.2 hrs Humidity60% Pressure1010.1 hPa

What this breeze does at Charleston — from fleet racing

Breeze: NW about 12 kn (weather reanalysis in the scorer’s units)
In fleet races at Charleston in this breeze: an underdogs’ day (−0.03)
Underdogs’ conditions: in fleet racing here the fleet bunches up and lower-rated boats beat the seeds more often than usual.

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 ±0.03 means a rating gap counts about 3% less 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 Charleston by wind direction (angle) and speed (rings), fitted surface; dots are labelled regatta-days, ★ this regatta (69 labelled fleet-race days at Charleston).

From the notes

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

All notes →