Statistical Plus/Minus (SPM) is an estimate of the player’s contribution to the team’s point differential per 100 possessions, using his box score stats as inputs. In another words, SPM can be considered as a way of estimating adjusted plus-minus from box score stats. Statistical plus-minus puts weight to basic box score stats like points, steals, blocks, etc., in an effort …

Steal Percentage is the percentage of estimated opponent possessions that end with a steal by the player while the player is on the court.

Tendex is Dave Heeren‘s player evaluation metric which is generally considered the first player rating system with linear weights.

Total player possessions is the total number of how many times a player ends his team’s possession. It represents a player’s total possessions in the game.

Touches estimate the number of times a player touched the ball in an attacking position on the floor. The theory behind the formula is that once a player gets the ball, he can only do one of four things (aside from dribbling, of course): pass, shoot, draw a foul, or commit a turnover. %Pass = 100 * (AST / 0.17) …

Trade Value is the estimate using a player’s age and his approximate value to determine how much value a player has left in his career. Invented by Bill James.

True shooting percentage, aka TS%, is a metric that factors a player’s or a team’s performance at the free-throw line and considers the efficiency of all types of shots. This NBA statistic helps us compare players with varying responsibilities and shooting abilites on the floor. A higher True Shooting Percentage generally indicates a more efficient scorer, while a lower percentage indicates …

Turnover Ratio, aka turnover percentage, is the percentage of a team’s or player’s possessions that end in a turnover. Calculating the number of turnovers a player will make in 100 possessions makes itself ‘tempo-free’ (adjusted for team pace and minutes played) NBA stats that everyone wants to look at. But, the turnover ratio is also limited, as it is a …

Usage rate, aka NBA usage percentage, is an estimate of the percentage of team plays used by a player while he was on the floor. Usage rate can be calculated with how a possession ends: “field-goal or free-throw attempt, or a turnover.   As you can identify on the chart, when a player is on the court, his usage rate …

Versatility Index, which is invented by John Hollinger, is a metric that measures a player’s ability to produce in more than one statistic. The metric uses points, assists, and rebounds. The average player will score around a five on the index, while top players score above 10. Versatility Index stats can be followed on our own player stats pages.

Win Probability Added aka WPA, utilizes box score stats to rank player contributions which are weighted to give more credit to clutch shots and pace of the game. Created by Mike Beuoy in 2014, WPA focuses on missed shots, made shots, turnovers, and free throws while ignoring rebounds, assists, blocks and steals in clutch minutes or in garbage time.

Win Score is David Berri’s metric that indicates the relative value of a player’s points, rebounds, steals, turnovers, and field goal attempts. Win Score is sufficient to give you a quick snapshot of a player’s performance. And it is especially useful if you wish to know if a player is playing better or worse than he did before.

Win Share is a measure that is assigned to players based on their offense, defense, and playing time. WS/48 is win shares per 48 minutes and invented by Justin Kubatko who explains: “A win share is worth one-third of a team win. If a team wins 60 games, there are 180 ‘Win Shares’ to distribute among the players.”

Wins Above Replacement Player (WARP) evaluates a player who belongs to a team that is made up of him and 4 average players. This team is compared to another team made up of, 4 average players and a replacement-level player. Using replacement level shows the value of players who can play heavy minutes and avoid injury while continuing to perform …