Data Sources & Attributions | Regression Candidate

DATA SOURCES & ATTRIBUTIONS

Last updated June 09, 2026 | Enterprise 479 LLC d/b/a Regression Candidate

Regression Candidate's analytics, projections, and rankings incorporate publicly available NFL data assembled by the nflverse open-data project and its contributors. We are grateful for their work and committed to honoring the open-license terms under which that data is shared. This page constitutes the required attribution notice for those materials.

1. NFLVERSE / NFLREADR

The nflverse project is a collection of open-source R and Python packages that aggregate and distribute NFL play-by-play, roster, player statistics, and related data. The data is maintained by a community of contributors and is made freely available under Creative Commons licenses.

Primary Contributors & Maintainers

The nflverse project is maintained by Sebastian Carl, Ben Baldwin, and a broader community of open-source contributors. Full contributor lists are available in the respective GitHub repositories linked above.

2. LICENSE COMPLIANCE NOTES

CC BY 4.0 (general nflverse data)

Under the CC BY 4.0 license, we are permitted to use, reproduce, and adapt the data for commercial purposes provided that we give appropriate credit to the nflverse contributors (satisfied by this Data Sources & Attributions page).

The analyses, models, rankings, and projections produced by Regression Candidate represent original creative and analytical work derived from underlying factual data. Individual raw statistical facts are not themselves protectable by copyright (Feist Publications v. Rural Telephone Service, 499 U.S. 340 (1991)). However, the way data is compiled and the license terms under which it is distributed remain enforceable — which is why we comply with the CC BY 4.0 and MIT terms described on this page. Outside the United States, additional rights such as sui generis database rights may also apply. Our own analyses, models, rankings, and projections represent original creative and analytical work — the original selection, weighting, and presentation of insights built on top of those underlying facts — and are separate from the licensors' rights in the underlying data.

MIT License (package code)

The nfl_data_py and nflreadr package code (not the data) is licensed under the MIT License, which imposes no restrictions on commercial use beyond preserving the copyright notice in derivative source code distributions. Regression Candidate uses these packages as software libraries and is in full compliance.

License Notices (retained from upstream sources)

In accordance with the CC BY 4.0 and MIT license terms, we retain below the copyright, license, and disclaimer notices supplied by our data and software sources. Pasting each source's full license file is the simplest way to satisfy the requirement to retain its copyright, license, and disclaimer notices together.

nflverse data (general) — CC BY 4.0. Licensed under CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/). Notice as supplied by nflverse:

Data sourced from the nflverse project and its contributors (Tan Ho, Sebastian Carl, and the nflverse community), via the nflverse-data repository: https://github.com/nflverse/nflverse-data

Licensed under the Creative Commons Attribution 4.0 International License (CC BY 4.0). Full license text: https://creativecommons.org/licenses/by/4.0/legalcode

Disclaimer: The data is provided "as is," without warranties of any kind, to the extent permitted by law (see CC BY 4.0, Section 5).

Changes: We use this data as an input to original statistical models; it has been processed, transformed, aggregated, and modeled to produce our rankings and projections.

nflreadr / nfl_data_py — MIT License. Used as software libraries. The MIT License requires the following copyright and permission notice be preserved:

Both packages are distributed under the MIT License:

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

espn-api — MIT License. Used as software libraries. The MIT License requires the following copyright and permission notice be preserved:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

No Endorsement

Attribution to the sources named on this page does not imply that those sources endorse Regression Candidate or its use of the data. Regression Candidate is not affiliated with, sponsored by, or endorsed by nflverse, FTN Data, the NFL, NFL teams or players, ESPN, Yahoo, Sleeper, Fantasy Football Calculator, or any other third-party source.

Notice of Modification: Where Regression Candidate has processed, transformed, or modeled raw data from the sources listed above, those transformations are indicated in the relevant product features. The underlying raw data remains the intellectual property of its respective licensors under the terms stated on this page.

3. OTHER DATA SOURCES

Regression Candidate may also incorporate data from the following sources. This section will be updated as additional data partnerships or integrations are established.

Source	Nature of Use	License / Terms
NFL.com public statistics (play-by-play, box scores)	Factual game data ingested via nflverse pipeline	Factual data not independently copyrightable; accessed via nflverse
Fantasy Football Calculator	Average Draft Position (ADP) data	Used with attribution per its terms; see fantasyfootballcalculator.com/terms. Credit is also shown in the site footer.
Sleeper API	Player, injury, and news data; player-ID mapping	Public API; subject to Sleeper's Terms of Use (sleeper.com/tos).
Yahoo Fantasy Sports API	User-authorized retrieval of the user's own league data	Official OAuth API; subject to Yahoo Developer Terms.
The Odds API	Sports betting market data used in analytical features	Proprietary API; commercial use in analytics products permitted under The Odds API Terms of Service. No attribution required; credited voluntarily.

4. THIRD-PARTY SOFTWARE

Regression Candidate is built with open-source software. A complete list of software dependencies and their licenses is available upon written request at legal@regressioncandidate.com.

5. CONTACT

If you believe we have failed to provide required attribution for a data source, or if you have questions about our licensing compliance, please contact us at legal@regressioncandidate.com.