About & data

An independent project that turns public NFL data into position rankings and weekly projections.

Built by John Wasikye

I designed and built the site, the data pipeline and the prediction engine myself. The code is public.

Email: john.wasikye@gmail.com
Other projects: See my other projects
Source code: nfl-player-performance on GitHub

Where the data comes from

All statistics come from nflverse, an open community project, and are used under the Creative Commons Attribution 4.0 license.

How often it updates

The pipeline runs once a day during the season, after the previous night's games have been added to the source data. The page header shows when the rankings were last refreshed. If a refresh is more than a day and a half late, a notice appears at the top of every page.

Glossary

EPA (expected points added): How much a play changed the team's expected points. A positive number means the play helped the offense.
CPOE: Completion percentage over expected: how a quarterback's completion rate compares with what the throws would normally produce.
RACR: Receiver air conversion ratio: receiving yards divided by air yards, a measure of how well a receiver turns targets into yards.
WOPR: Weighted opportunity rating: a blend of a receiver's share of the team's targets and air yards.
Target share / air yards share: The fraction of the team's targets or air yards that went to the player.
PPR: Points per reception: fantasy scoring that gives a point for every catch.
Percentile: Where a player sits among their position group: the 90th percentile means better than 90% of them.