ISSA National Keelboat Challenge

# SchoolTeam A TOT
1 Clear Falls High School Clear Falls High School Knights 19 19
2 Archbishop Spalding Archbishop Spalding Cavaliers 23 23
3 Newport Harbor High School Newport Harbor High School Sailors 26 26
4 Shorecrest Preparatory School Shorecrest Preparatory School Chargers 32 32
5 Annapolis High School Annapolis High School Panthers 33 33
6 North Kingstown High School North Kingstown High School Skippers 33 33
7 Minnetonka High School Minnetonka High School Skippers 34 34
8 Sehome High School Sehome High School Mariners V 37 37
9 Falmouth High School, ME Falmouth High School, ME Yachtsmen 40 40
10 St. Ignatius College Prep, Chicago, IL St. Ignatius College Prep, Chicago, IL Wolfpack 54 54
SchoolTeam R1 R2 R3 R4 R5 R6 TOT
Clear Falls High School Clear Falls High School Knights 8 5 1 3 1 1 19
Archbishop Spalding Archbishop Spalding Cavaliers 7 3 4 1 2 6 23
Newport Harbor High School Newport Harbor High School Sailors 3 1 3 5 3 DSQ 26
Shorecrest Preparatory School Shorecrest Preparatory School Chargers 1 4 9 2 8 8 32
Annapolis High School Annapolis High School Panthers 2 6 10 7 5 3 33
North Kingstown High School North Kingstown High School Skippers 9 2 2 9 4 7 33
Minnetonka High School Minnetonka High School Skippers 5 10 5 4 6 4 34
Sehome High School Sehome High School Mariners V 4 9 7 6 9 2 37
Falmouth High School, ME Falmouth High School, ME Yachtsmen 6 8 6 8 7 5 40
St. Ignatius College Prep, Chicago, IL St. Ignatius College Prep, Chicago, IL Wolfpack 10 7 8 10 10 9 54

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 78 ISSA 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.

Division A  10 boats · 6 races

FinSkipperSchool Races Rating
before
Perf.
rating
Δ Percentile
before → perf.
Surprise
(bits)
P(this good
or better)
Avg finish
actual / exp.
1Dane Byerly '16Clear Falls High School6/62.292.71+0.4299th → 99th0.523%3.2 / 4.5
2Cole Daitch '16Archbishop Spalding6/61.652.58+0.9399th → 99th2.314%3.8 / 5.7
3Sean Segerblom '16Newport Harbor High School6/62.473.03+0.5699th → 99th0.757%4.3 / 4.3
4Josh Dochoda '16Shorecrest Preparatory School6/62.291.51−0.7899th → 92nd2.272%5.3 / 4.5
5Delaney Bamford '16North Kingstown High School6/61.811.57−0.2499th → 94th0.253%5.5 / 5.5
5Porter Kavle '18Annapolis High School6/61.881.70−0.1899th → 99th0.160%5.5 / 5.3
7Conrad (Cort) Vandlik '17Minnetonka High School6/61.621.67+0.0594th → 99th0.049%5.7 / 5.8
8Liam Hood '16Sehome High School6/61.471.56+0.0992nd → 94th0.054%6.2 / 6.0
9Audrey Morin '17Falmouth High School, ME6/61.411.64+0.2392nd → 97th0.265%6.7 / 6.1
10Matthew Alfano '17St. Ignatius College Prep, Chicago, IL6/60.72-0.06−0.7955th → 4th1.189%9.0 / 7.4

Conditions — 11/21/2015 (8am–6pm)

☁️Overcast
Humidity 81%  ·  Pressure 1013.8 hPa

Temperature

76°F
↑ 80°F   ↓ 71°F
Feels like 82°F

Wind

● from   ▲ toward
3.9 kn
avg  ·  max 6.4 kn
Gusts to 12.2 kn
From ESE (120°)

Sky & Precipitation

Cloud cover99% Sunshine3.2 hrs Humidity81% Pressure1013.8 hPa Rain0.02 in

What this breeze does at Shorecrest Preparato — from fleet racing

Breeze: SE about 7 kn (weather reanalysis in the scorer’s units)
In fleet races at Shorecrest Preparato in this breeze: a strongly underdogs’ day (−0.12)
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 ±0.12 means a rating gap counts about 10% 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 Shorecrest Preparato by wind direction (angle) and speed (rings), fitted surface; dots are labelled regatta-days, ★ this regatta (only 4 labelled days at Shorecrest Preparato, 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 →