Glossary
Impact Ratings
- OFF wRAPM
- Player offensive impact per 100 possessions from weighted regularized adjusted plus-minus.
- DEF wRAPM
- Player defensive impact per 100 possessions from weighted regularized adjusted plus-minus.
- OVR wRAPM
- Total player impact per 100 possessions from weighted regularized adjusted plus-minus.
- ORtg
- Points scored per 100 possessions.
- DRtg
- Points allowed per 100 possessions. Lower is better.
- NetRtg
- Offensive rating minus defensive rating per 100 possessions.
- On/Off
- Difference between team performance with the player on the court and off the court.
Scoring
- TS%
- Scoring efficiency including twos, threes, and free throws.
- eFG%
- Field goal percentage adjusted to give extra credit for made threes.
- USG%
- Share of team possessions finished by a player via shot, free throws, or turnover.
- %AST
- Share of made field goals that were assisted.
- FTr
- Free throw attempts divided by field goal attempts.
- %Rim
- Share of field goal attempts taken at the rim or in the restricted area.
- %3PT
- Share of field goal attempts that are three-point attempts.
Playmaking
- AST%
- Estimated share of teammate made field goals assisted by the player while on court.
- TOV%
- Estimated turnovers per 100 individual or team plays.
- STL%
- Steals per possession.
- BLK%
- Blocks per possession.
Team Defense
- Opp TS%
- Opponent scoring efficiency allowed, including twos, threes, and free throws.
- Opp eFG%
- Opponent field goal percentage allowed, adjusted to give extra credit for made threes.
- Opp %Rim
- Share of opponent field goal attempts allowed at the rim or in the restricted area.
- Opp %3PT
- Share of opponent field goal attempts allowed from three.
- DREB%
- Share of available defensive rebounds collected.
wRAPM
Raw plus-minus is useful in theory but noisy in practice because players do not share the floor with random teammates and opponents. wRAPM starts with pure RAPM, which is calculated by creating play-by-play stints, turning each no-substitution segment into a possession-weighted scoring margin, and solving for offensive and defensive player values while controlling for the other nine players on the court. The pure RAPM model uses ridge regression to handle lineup collinearity and shrink unstable small-sample estimates toward zero. wRAPM then leans more heavily on higher-possession, more reliable samples and folds in player-specific priors (without using box-score stats) from previous pure RAPM seasons. Read the final number as an adjusted impact estimate in points per 100 possessions.