Birmingham Public Schools '25
How much better or worse boats do with this sailor crewing than their skipper's rating predicts, shown on the skipper scale so crews can be lined up across teams. Percentiles compare against rostered crews that season (league) or teammates (team).
How crew ratings work →Crew effect over their whole career, not scaled to a team: 37.55 percentile among ICSA crews with 30+ races. Uncertainty ±0.106 rating points from 50 races with rated skippers.
How crew ratings work →| Season | Team | Rating | Range | League percentile |
Team percentile |
On team | Races | Team page |
|---|---|---|---|---|---|---|---|---|
| Fall 2023 | Birmingham Public Schools | -0.18 | 15.90 | 62.50 | 2 of 4 | 13 | Team page | |
| Fall 2022 | Birmingham Public Schools | -0.28 | 11.92 | 25.00 | 5 of 6 | 15 | Team page |
Each discipline has its own scale, built from the sailor's main rating and their results in that discipline. The numbers are not comparable with the main rating or with each other.
How these ratings work →| Discipline | Rating | Rank | Races | Last raced |
|---|---|---|---|---|
| Singlehanded | 1.49 | 127 of 337 | 36 | Fall 2024 |
A team race rating is what the sailor brings to one of the three boats: 0.72 x their fleet rating plus a team-race offset learned from every match they sailed, shrunk toward zero so a few matches cannot move it far. Sides are compared by the sum of their three boats plus the school's team race strength.
| Rating | Rank | vs fleet rating | Record |
|---|---|---|---|
| 1.07 (fleet 1.77) | 142 of 231 | −0.03 ± 0.17 about what the fleet rating predicts |
as skipper 18–35 (34%) as crew 2–4 (33%) |
| Season | Regattas | Skipper W–L | Crew W–L |
|---|---|---|---|
| Spring 2025 | 2 | 9–15 | — |
| Spring 2024 | 1 | 2–4 | — |
| Spring 2023 | 1 | 1–3 | — |
| Spring 2022 | 3 | 6–13 | 2–4 |
Rating before each regatta driven (solid; dots green when the boat won 60% or more of its matches there, red under 40%) and what the fleet rating alone would give (dashed). The gap is the team race offset as it stood at the time. Hover a dot for the regatta; click to open it.
For each regatta, the boat value that would have made this sailor's record least surprising: the shift applied to their boat alone, in the matches they sailed, with team-mates and opponents fixed at the pre-event forecast. A boat's skipper and crew share the boat, so they get the same number when they sailed every match together. Surprise is in bits at the pre-event value minus at the performance value; P(this good or better) treats the matches as independent at the forecast probabilities. Regattas forecast from fewer than 1,000 training matches are left out.
Over 7 graded regattas (59 matches) the record is 20–39 against 23.6 wins the pre-event forecasts expected (−3.6). 0 regattas clearly above the rating (P ≤ 20%), 3 clearly below (P ≥ 80%); 3 bits of surprise in all.
| Date | Regatta | Role | Value | Perf. | Record | Exp. wins |
Δ | Surprise (bits) |
P(this good or better) |
|---|---|---|---|---|---|---|---|---|---|
| 2025-04-26 | GPYC - MISSA Baker Qualifier | skipper | 1.18 | 0.62 | 4–8 | 4.8 | −0.56 | 0.3 | 84% |
| 2025-04-11 | MISSA NE Baker Pre Qualifier | skipper | 0.86 | 0.69 | 5–7 | 5.3 | −0.17 | 0.0 | 70% |
| 2024-04-12 | Michigan Baker Pre-Qualifier | skipper | 0.58 | 0.65 | 2–4 | 1.9 | +0.07 | 0.0 | 67% |
| 2023-04-14 | Baker Pre Qualifier East Michigan | skipper | 0.75 | -0.06 | 1–3 | 1.5 | −0.81 | 0.2 | 87% |
| 2022-05-01 | MISSA Baker Silver Fleet | crew | 0.50 | 0.51 | 2–4 | 2.0 | +0.01 | 0.0 | 67% |
| 2022-04-30 | MISSA Baker Qualifier | skipper | 0.63 | -2.37 | 0–9 | 1.8 | ≤−3.00 | 2.9 | >99% |
| 2022-04-08 | Baker Pre Q East Michigan | skipper | 0.46 | 0.25 | 6–4 | 6.3 | −0.21 | 0.0 | 73% |
| League | Name | School | Year |
|---|---|---|---|
| ICSA | Sean Ellison |  Jacksonville University |
'29 |
| ISSA | Sean Ellison |  West Bloomfield High School |
'25 |
| ISSA | Sean Ellison |  Brother Rice/Marian High School - MI |
'25 |
| ISSA | Sean Ellison |  Avondale High School |
'25 |
| ISSA | Sean Ellison |  Detroit Country Day School |
'25 |
Short write-ups of what the ratings and results show, with the numbers and how they were computed.
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