Helena Frye
Plus-minus is a basketball statistic that indicates how many points a team gained or lost relative to their opponents when a particular player was on the court. It is a measure of the impact a player has on the game without measuring any specific statistic. Plus-minus is useful in showing how players that may not put up big individual numbers still have a positive impact on the game. It is also known as Box Plus/Minus (BPM), which is a basketball box score-based metric that estimates a basketball player’s contribution to the team when that player is on the court.
| Characteristics | Values |
|---|---|
| Purpose | To estimate a basketball player’s contribution to the team when that player is on the court |
| Calculation | The difference in the score when the player enters the game minus the score when the player exits the game. These differences are added up over the entire game to give the score |
| Applicability | Plus/Minus is useful in showing how players that may not put up big individual numbers still have a positive impact on the game |
| Limitations | Plus/Minus does not take into account playing time and is purely a rate stat |
| Examples | Scoot Henderson posted a -58 plus/minus against the Miami Heat in their last outing, which is an NBA record. Shaedon Sharpe has a -7.7 cumulative plus/minus over 55 games this season |
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What You'll Learn
Plus/minus is a useful indicator of a player's impact on the game
Plus/minus is a useful indicator of a player's impact on a basketball game. It is a statistic that indicates how many points a team gained or lost relative to their opponents when a particular player was on the floor. If a player comes into the game and their team is up by 10 points, but the game is tied when they exit, their plus/minus for that stretch will be -10. Cumulative plus/minus stats are calculated by adding up all of a player's stretches for the evening.
Plus/minus is useful for showing how players that may not put up big individual numbers still have a positive impact on the game. For example, if a player is on the court when their team is outscoring its opponents, they must be doing something to help their team succeed. A player with a consistently net-positive plus/minus typically has a positive impact on their team's success.
Box Plus/Minus (BPM) is a type of plus/minus that is a basketball box score-based metric that estimates a basketball player’s contribution to the team when that player is on the court. It uses a player’s box score information, position, and the team’s overall performance to estimate the player’s contribution in points above the league average per 100 possessions played. BPM does not take into account playing time, and it does not include play-by-play data or non-traditional box score data. While BPM is good at measuring offense, the defensive numbers should not be considered definitive.
Plus/minus has its limitations as a statistic. It provides a baseline for team performance, but the stat is applied to a single player, which can lead to statistical "noise". For example, a player might score 20 points per game, but if their plus/minus runs consistently negative, their scoring may not be as valuable as it seems. Additionally, plus/minus may be more useful when looking at groups of players, like starters or bench players, rather than individual players. It is also important to consider that a team's performance can impact the plus/minus of individual players. For example, if a team is consistently losing games, their players' plus/minus stats will likely be negative, regardless of individual performance.
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Plus/minus is a good measure of offensive performance
Plus/minus is a basketball statistic that indicates how many points a team gained or lost relative to their opponents when a particular player was on the floor. It is a measure of the impact a player has on the game's score without measuring any specific statistic. Plus/minus is calculated by taking the difference in the score when a player enters the game and subtracting it from the score when the player exits. These differences are then added up over the entire game to give a final score.
Box Plus/Minus (BPM) is a specific type of plus/minus metric that uses a player's box score information, position, and team performance to estimate their contribution in points above the league average per 100 possessions played. BPM does not take into account playing time, focusing purely on the rate at which a player contributes to their team's performance. BPM is considered particularly good at measuring offensive performance, capturing nearly everything of importance on the offensive side. While BPM defensive numbers should not be considered definitive, they can still be used as a guide.
Plus/minus can also be useful when looking at groups of players, such as starters or bench players. For example, if a team's starters are all hovering around a -25 plus/minus while most of the bench players are positive, it could indicate that the opposing team's starting lineup was superior, and that's how the game was lost.
However, it's important to note that plus/minus should not be the only statistic used to evaluate players. It is best used in conjunction with other metrics and considered over a larger sample size, such as halfway through the season, to account for anomalies and provide a more accurate picture of a player's impact.
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Plus/minus is not definitive for defensive performance
Plus-minus statistics are a useful tool for measuring a player's impact on the game. It is calculated by keeping track of the net changes in the score when a given player is either on or off the court. While it is a good way to capture the "invisible" contributions that traditional box scores miss, it is heavily influenced by teammates and sample size. For instance, a great player on a poor team might show negative values, while an average player surrounded by good teammates might appear more impactful than they truly are.
Plus-minus statistics are also limited by the information available in the box score. While they are good at measuring offensive performance, they struggle with defence. This is because the box score relies on counting statistics, which are inherently better at measuring offensive performance. For example, a player who sets solid screens, makes timely rotations on defence, or creates spacing through off-ball movement might not fill the stat sheet, but their impact becomes evident with plus-minus.
Box Plus/Minus (BPM) is a version of plus-minus that is based on the traditional basketball box score. It estimates a player's contribution in points above the league average per 100 possessions played. However, BPM does not take into account playing time, which can affect the accuracy of defensive estimates.
Another limitation of BPM is that it assumes that all players on a good team have contributed equally. This can lead to big men being overrated on defence and pass-first guards being underrated. For example, a block by a center is good, but a block by a guard is great. Therefore, while plus-minus can provide valuable insights into a player's defensive performance, it should not be considered definitive.
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Plus/minus is a cumulative stat
For example, if Player A comes into the game when their team is up by 10 points, but the game is tied when they exit, their plus/minus for that stretch will be -10. If a player continually has a net positive plus/minus, it means they typically have a positive impact on their team's success. On the other hand, a player with a net negative plus/minus may be having a negative impact on their team's performance.
Plus/minus is useful for showing how players that may not put up big individual numbers can still positively impact the game. For instance, a player with a low field goal percentage but a positive plus/minus is still contributing to their team's success. Plus/minus can also be used to evaluate groups of players, such as starters or bench players. If a team's starters are all hovering around a -25 plus/minus, while most of the bench players are positive, it could indicate that the opposing team's starting lineup was superior, and that's how the game was lost.
Box Plus/Minus (BPM) is a variation of the plus/minus stat that uses a player's box score information, position, and team performance to estimate their contribution in points above the league average per 100 possessions played. BPM does not take into account playing time or additional statistics like play-by-play data or non-traditional box score data. While BPM is good at measuring offense, the defensive numbers should be considered with caution.
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Plus/minus is a good indicator of team performance
Plus/minus is a basketball statistic that indicates how many points a team gained or lost relative to the opponent when a player was on the floor. It is a good indicator of team performance as it shows the impact of a player on the team's success. For example, if a player is on the court when their team is outscoring its opponents, the player must be contributing to the team's success.
Plus/minus is calculated by taking the difference in the score when a player enters the game and subtracting it from the score when the player exits. These differences are then added up over the entire game to give the final score. This allows for a measurement of the impact a player has on the game without measuring any specific statistic.
Box Plus/Minus (BPM) is a variation of the plus-minus statistic that uses a player's box score information, position, and the team's overall performance to estimate the player's contribution in points above the league average per 100 possessions played. BPM does not take into account playing time, focusing purely on the rate at which points are scored when a player is on the court.
While plus/minus is a useful indicator of team performance, it is important to note that it is not a definitive measure. The statistic is applied to individual players, but the baseline for the stat is team performance, which can lead to statistical "noise". For example, a player with a high individual score may have a negative plus/minus if their team is consistently outscored when they are on the court. Additionally, plus/minus does not capture all aspects of a player's contribution, particularly on the defensive side, as it relies solely on box score data.
Despite these limitations, plus/minus can provide valuable insights into the impact of players on their team's performance, especially when considered in conjunction with other metrics and over a larger number of games.
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Frequently asked questions
Plus/Minus is a measure of the point differential when players are in and out of a game. It indicates how many points a team gained or lost relative to the opponent when a player was on the floor.
Plus/Minus is calculated by taking the difference in the score when the player enters the game and subtracting it from the score when the player exits the game. These differences are then added up over the entire game to give the final score.
A high Plus/Minus score indicates that a player has had a positive impact on their team's success. It is useful in showing how players that may not put up big individual numbers still have a positive influence on the game.
