2019 ISSA Keelboat Invitational

# SchoolTeam A TOT
1 Ransom Everglades School Ransom Everglades School Raiders 23 23
2 Mater Dei High School Mater Dei High School Monarchs 40 40
3 St. George's School St. George's School Dragons 47 47
4 Bay High School Bay High School Varsity 51 51
5 Christchurch School Christchurch School Seahorses 52 52
6 Newport Harbor High School Newport Harbor High School Sailors 52 52
7 New Trier HS New Trier HS Trevian 61 61
8 Gig Harbor High School Gig Harbor High School Tides 62 62
9 Clear Falls High School Clear Falls High School Knights 73 73
10 St. Joseph's Collegiate Institute St. Joseph's Collegiate Institute Marauders 86 86
SchoolTeam R1 R2 R3 R4 R5 R6 R7 R8 R9 R10 TOT
Ransom Everglades School Ransom Everglades School Raiders 1 1 1 1 2 4 1 1 8 3 23
Mater Dei High School Mater Dei High School Monarchs 6 3 3 4 1 2 9 7 4 1 40
St. George's School St. George's School Dragons 2 2 BKD 5 7 3 6 6 3 8 47
Bay High School Bay High School Varsity 5 5 7 7 6 6 4 5 1 5 51
Christchurch School Christchurch School Seahorses 3 9 2 10 10 BKD 3 2 6 2 52
Newport Harbor High School Newport Harbor High School Sailors 9 7 4 3 4 1 2 8 10 4 52
New Trier HS New Trier HS Trevian 7 6 8 6 5 5 5 4 5 10 61
Gig Harbor High School Gig Harbor High School Tides 4 4 5 2 3 10 7 9 9 9 62
Clear Falls High School Clear Falls High School Knights 10 10 9 9 8 8 8 3 2 6 73
St. Joseph's Collegiate Institute St. Joseph's Collegiate Institute Marauders 8 8 10 8 9 9 10 10 7 7 86

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 · 10 races

FinSkipperSchool Races Rating
before
Perf.
rating
Δ Percentile
before → perf.
Surprise
(bits)
P(this good
or better)
Avg finish
actual / exp.
1Stephan Baker '22Ransom Everglades School10/102.263.51+1.2599th → 99th5.63%2.3 / 4.8
2Reade Decker '23Mater Dei High School10/102.212.51+0.2999th → 99th0.429%4.0 / 4.9
3Jack Vanderhorst '22Bay High School10/101.972.24+0.2799th → 99th0.447%5.1 / 5.3
4Erik Hou '20Newport Harbor High School10/102.241.88−0.3699th → 99th0.760%5.2 / 4.9
5Hayden Earl '21St. George's School10/101.792.36+0.5699th → 99th1.442%5.3 / 5.7
6Gannon Troutman '21Christchurch School10/101.921.63−0.2999th → 95th0.361%5.8 / 5.4
7Garrett Cook '20New Trier HS10/101.471.85+0.3892nd → 99th0.747%6.1 / 6.2
8Axel Stordahl '20Gig Harbor High School10/101.651.65−0.0199th → 97th0.059%6.2 / 5.9
9Ava Anderson '23Clear Falls High School10/101.381.29−0.0992nd → 91st0.071%7.3 / 6.4

Conditions — 12/14/2019 (8am–6pm)

☀️Clear sky
Humidity 71%  ·  Pressure 1010.9 hPa

Temperature

70°F
↑ 73°F   ↓ 67°F
Feels like 69°F

Wind

● from   ▲ toward
10.3 kn
avg  ·  max 14.8 kn
Gusts to 27.8 kn
From NW (314°)

Sky & Precipitation

Cloud cover9% Sunshine9.0 hrs Humidity71% Pressure1010.9 hPa

What this breeze does at Shorecrest Prep/St. Petersburg — from fleet racing

Breeze: NW about 12 kn (weather reanalysis in the scorer’s units)
In fleet races at Shorecrest Prep/St. Petersburg 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 11% 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 Prep/St. Petersburg by wind direction (angle) and speed (rings), fitted surface; dots are labelled regatta-days, ★ this regatta (only 2 labelled days at Shorecrest Prep/St. Petersburg, 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 →