Data & Sources
Every production value on this site traces to an admitted source capture: an exact upstream release asset, hash-pinned, license-recorded, schema-fingerprinted, and receipted. Nothing is scraped. Upstream changes are treated as drift requiring review — never silently absorbed.
▸ Attribution
- Play-by-play, schedules, rosters, players and supporting datasets: nflverse, CC BY 4.0.
- Participation data 2016–2022: NFL NextGenStats via nflverse, CC BY 4.0.
- Participation data 2023 onward: FTN Data via nflverse, CC BY-SA 4.0 (share-alike — tracked on a segregated license lineage).
- Charting descriptors 2022 onward: ftndata.com via nflverse, CC BY-SA 4.0.
- Snap counts: Pro Football Reference, via nflverse's licensed redistribution.
- Contracts: OverTheCap.com via nflverse.
Proprietary systems (PFF, SIS Total Points, ESPN Total QBR, FTN DVOA) are referenced for methodology and used — where permitted — only as private validation comparators. Their values are never scraped, displayed, or used as training labels. Big Data Bowl tracking data is contractually restricted and is never used.
▸ Source register
The live register below is generated from the machine-readable rights registry — the same file the capture tooling enforces. Raw JSON: sources.json · freshness.json
| Source | Rights status | License | Attribution | Captured |
|---|---|---|---|---|
| Enable JavaScript for the live table, or read sources.json directly. | ||||
▸ Field coverage by season
Non-null rates for the participation fields models depend on — measured, not assumed. A field a season never recorded bounds what that season's models may claim. Raw JSON: coverage-map.json
| Enable JavaScript for the live table, or read coverage-map.json directly. |
▸ Known source limits, stated plainly
- Participation data for 2023 onward arrives only after each postseason ends — it never updates in-season. In-season features rely on nightly play-by-play and ~48-hour charting descriptors instead.
- Participation reveals who was on the field, never who was responsible. Assignment-level evidence is not lawfully available to a public product — which is why trench and coverage estimates carry wider uncertainty and competing-model disagreement.
- NGS aggregate stats currently cover 2016–2024 upstream.
- Completion probability and CPOE fields exist only from 2006 onward.