Declared breaks
| Break | Season | What it changes | Invalidates |
|---|---|---|---|
| Unavailable. | |||
What this means for pooling
Every model in this project declares the seasons it was fitted on and the regime those seasons belong to. Where a model pools across a break, it says so and states why the pooled quantity is still meaningful. Where it cannot, the model is fitted per regime instead.
The 2026 automated ball-strike regime is a declared coordinate break for any pitch-level metric. No pitch-level metric is published, and the seam that would consume one validates the regime in both directions before admitting a single row — see Pitch data.