Site Retention
Which schools run a team again the next season, and what predicts it. Headline: 76.3% of schools came back within a year. Data through Spring 2025; Fall 2026 is added once registration closes.
What the data says
When schools are compared side by side with everything else equal, four things clearly help. Out of every 100 schools, about 14 more come back when they also ran a team the term before, about 10 more when they are in their 5th season instead of their 1st, about 10 more with 16 boys instead of 8, and about 7 more in a focus region. Having 3 or more coaches helps a little, about 4 more.
A returning coach, all-parent coaching staff and returning boys look strong on their own, but mostly because big, long-running schools have more of all of them. With everything else equal, none of them makes a clear difference.
| Group | Schools | Came back |
|---|---|---|
| Charlotte | 1,035 | 82.3% |
| Columbus | 160 | 72.5% |
| Expansion | 1,169 | 71.3% |
| Seattle | 103 | 79.6% |
| St. Louis | 199 | 74.9% |
| Group | Schools | Came back |
|---|---|---|
| 1st season | 803 | 65.4% |
| 2nd | 482 | 73.4% |
| 3rd-4th | 577 | 79.0% |
| 5th-7th | 391 | 88.0% |
| 8th+ | 413 | 85.7% |
| Group | Schools | Came back |
|---|---|---|
| 1-5 | 121 | 55.4% |
| 6-9 | 708 | 69.6% |
| 10-14 | 1,178 | 76.8% |
| 15-19 | 394 | 85.8% |
| 20+ | 265 | 86.8% |
| Group | Schools | Came back |
|---|---|---|
| 1 team | 2,530 | 75.6% |
| 2+ teams | 136 | 87.5% |
| Group | Schools | Came back |
|---|---|---|
| none on file | 20 | 75.0% |
| 1 | 219 | 64.8% |
| 2 | 987 | 73.4% |
| 3+ | 1,440 | 80.0% |
| Group | Schools | Came back |
|---|---|---|
| all parent-coaches | 265 | 73.2% |
| mixed parent + non-parent | 997 | 79.3% |
| no coach on file | 20 | 75.0% |
| no parent-coaches | 1,384 | 74.6% |
| Group | Schools | Came back |
|---|---|---|
| a coach returned from last yr | 956 | 82.8% |
| no coach on file | 20 | 75.0% |
| no returning coach | 1,690 | 72.5% |
| Group | Schools | Came back |
|---|---|---|
| 0% | 1,188 | 67.0% |
| 1-25% | 409 | 80.0% |
| 26-50% | 623 | 84.0% |
| 51%+ | 446 | 86.8% |
| Group | Schools | Came back |
|---|---|---|
| yes (fall team ran the spring before, or spring team ran the fall before) | 1,184 | 87.2% |
| no | 1,482 | 67.5% |
| Group | Schools | Came back |
|---|---|---|
| Fall | 1,354 | 76.3% |
| Spring | 1,312 | 76.2% |
How we measured this (definitions, caveats — click to expand)
What a school is
A school is a Pinwheel site ID. A school-season is a school with at least one registered boy in a fall or a spring. Spring 2013, waiver events and summer events are left out; old programs are folded into today’s five regions.
Came back
At least one registered boy in the very next term or the same term a year later. Fall 2025 and Spring 2026 are not scored yet because Fall 2026 registration is still open. Spring 2019 through Spring 2021 are left out (COVID). “Ran a team the term before” overlaps with coming back: a school that runs both terms has two chances inside the year, so read it as “year-round schools tend to stay”.
Coaches
Coaches are matched to a school through their team; about one coach row in nine could not be matched and is left out of the coach factors. A parent-coach is a coach whose email matches a guardian email of a boy at the same school that season; emails tied to four or more boys at one school are treated as coordinators.
Seasons already run
Counts back only to Spring 2014, so schools that started earlier look younger than they are in the first few years.
Everything else equal
A standard statistical model that holds region, term and year steady, on school-seasons with at least one coach on file. The ranges come from re-running it 200 times on resampled schools. Financial aid and Title I are not used: the aid data is too unreliable and Title I is blank for most rows.
Correlated, not causal
A big roster may keep a school alive, or a healthy school may simply draw a big roster.