Pairwise course analysis
Williston Northampton School 5Kvs.Groton School
Based on runners who competed on both courses during the same season. Positive values mean the second course ran slower; negative values mean it ran faster.
Model verdict
Groton School runs faster
-3.25%
Roughly 39.0 seconds faster for a 20:00 runner
Paired observations
24
Developing evidence
Median difference
-4.77%
Middle runner-season comparison
Overall estimate
-3.25%
Network-adjusted course estimate
Middle 50% range
+4.94%
Observed variation (IQR)
Direction and magnitude
Relative course speed
Confidence interval
-6.44% to -3.38%
Scale shown
-8% to +8%
Course context
The two courses
Underlying runner comparisons
Same-season evidence
Each row represents one runner-season with valid results on both courses. Median performances reduce the effect of one unusually good or poor race. JV and varsity results are included.
| Runner | Season | Williston Northampton School 5K | Groton School | Difference |
|---|---|---|---|---|
| Stephanie Mo | 2025 | 35:49.001 race | 30:57.002 races | -13.59% |
| Samara Gorton | 2025 | 26:04.001 race | 23:11.002 races | -11.06% |
| Sofia FloresQuero Llama | 2025 | 23:48.001 race | 21:16.002 races | -10.64% |
| Henry Seilheimer | 2025 | 20:28.001 race | 18:41.001 race | -8.71% |
| Ceres Moraitis | 2025 | 20:51.001 race | 19:18.002 races | -7.43% |
| Gabriela Coates | 2025 | 23:54.001 race | 22:08.002 races | -7.39% |
| Kelly Zhao | 2025 | 21:40.001 race | 20:13.002 races | -6.69% |
| Felix Deschenes | 2025 | 20:33.001 race | 19:17.002 races | -6.16% |
| Philip Holland | 2025 | 19:06.001 race | 18:02.002 races | -5.58% |
| Pauline McAndrew | 2025 | 23:19.001 race | 22:02.001 race | -5.50% |
| Zachary Lim | 2025 | 22:45.001 race | 21:36.001 race | -5.05% |
| Mateo Garciarramos Petr | 2025 | 20:03.001 race | 19:04.002 races | -4.90% |
| Eric Liang | 2025 | 21:15.001 race | 20:16.002 races | -4.63% |
| Ryder Woodworth | 2025 | 19:46.001 race | 18:53.002 races | -4.47% |
| Izzy Hall | 2025 | 25:15.001 race | 24:19.002 races | -3.70% |
| Bibi Miotke | 2025 | 27:07.001 race | 26:10.002 races | -3.50% |
| Kevin Kerrigan | 2025 | 21:29.001 race | 20:50.002 races | -3.03% |
| Chase Bellamy | 2025 | 18:16.001 race | 17:51.001 race | -2.28% |
| Ayo Pickering | 2025 | 28:28.001 race | 27:50.002 races | -2.22% |
| Rory Christopher | 2025 | 20:20.001 race | 19:59.002 races | -1.72% |
| Sydney Nelson | 2025 | 20:43.001 race | 20:25.002 races | -1.45% |
| George Taggart | 2025 | 20:14.001 race | 20:27.002 races | +1.07% |
| Aaron DuFrend | 2025 | 21:03.001 race | 21:17.001 race | +1.11% |
| Adalynne Mertz | 2025 | 28:29.001 race | 28:50.002 races | +1.23% |