NBA Plus-Minus Explained: What It Means and Why It Matters
Plus-minus is the most misunderstood stat in basketball. In its simplest form, it measures the point differential when a player is on the court. But there are many versions of plus-minus, and understanding the differences is crucial for evaluating player impact.
Raw plus-minus
Raw plus-minus is simple: if your team outscores the opponent by 10 points while you're on the court, your plus-minus is +10. The problem? It's heavily influenced by teammates and opponents. A bench player on the Celtics might have a great plus-minus simply because he plays alongside Tatum and Brown. Raw plus-minus tells you more about the team than the individual.
Adjusted plus-minus (APM)
APM uses regression analysis to isolate a player's individual contribution from his teammates and opponents. It answers the question: how much better or worse is the team with this specific player on the court, controlling for who else is playing? APM is more accurate than raw plus-minus but requires large sample sizes to be reliable.
Modern impact metrics
EPM (Estimated Plus-Minus): Created by Dunks and Threes, EPM combines box score stats with tracking data to estimate a player's impact. It's one of the most respected modern metrics and correlates well with team success.
RAPTOR: Created by FiveThirtyEight, RAPTOR uses play-by-play data and player tracking to estimate offensive and defensive impact. It's split into RAPTOR Offense and RAPTOR Defense, which helps identify where a player's value comes from.
This season's leaders
The top players by EPM this season: 1. Jokic (+9.8), 2. SGA (+8.4), 3. Wembanyama (+7.2), 4. Tatum (+6.8), 5. Giannis (+6.5). These numbers mean that when Jokic is on the court, the Nuggets outscore opponents by 9.8 points per 100 possessions more than a league-average player would. That's an enormous impact.
How to use plus-minus
Don't use raw plus-minus for individual player evaluation — it's too noisy. Use EPM or RAPTOR for a more accurate picture. And always combine impact metrics with the eye test. Numbers tell you what happened; watching the game tells you why.