# BASKETBALL METRICS GLOSSARY

**TS% - True Shooting Percent**

PTS / (2 * ( FGA + 0.44 * FTA)).

True shooting percentage is a measure of shooting efficiency that takes into account field goals, 3-point field goals, and free throws.

**eFG% - Effective Field Goal Percent**

(FG + 0.5 * 3P) / FGA.

This statistic adjusts for the fact that a 3-point field goal is worth one more point than a 2-point field goal. For example, suppose Player A goes 4 for 10 with 2 threes, while Player B goes 5 for 10 with 0 threes. Each player would have 10 points from field goals, and thus would have the same effective field goal percentage (50%).

**dREB% - Defensive Rebound Percent**

100 * (DRB * (Tm MP / 5)) / (MP * (Tm DRB +Opp ORB))

Defensive rebound percentage is an estimate of the percentage of available defensive rebounds a player grabbed while he was on the floor.

**oREB% - Offensive Rebound Percent**

100 * (ORB * (Tm MP / 5)) / (MP * (Tm ORB +Opp DRB))

Offensive rebound percentage is an estimate of the percentage of available offensive rebounds a player grabbed while he was on the floor.

**tREB% - Total Rebound Percent**

100 * (TRB * (Tm MP / 5)) / (MP * (Tm TRB + OppTRB))

Total rebound percentage is an estimate of the percentage of available rebounds a player grabbed while he was on the floor.

**AST% - Assist Percent**

100 * AST / (((MP / (Tm MP / 5)) * Tm FG) - FG)

Assist percentage is an estimate of the percentage of teammate field goals a player assisted while he was on the floor.

**STL% - Steal Percent**

100 * (STL * (Tm MP / 5)) / (MP * Opp Poss)

Steal Percentage is an estimate of the percentage of opponent possessions that end with a steal by the player while he was on the floor.

**TOV% - Turnover Percent**

100 * TOV / (FGA + 0.44 * FTA + TOV)

Turnover percentage is an estimate of turnovers per 100 plays.

**BLK% - Block Percent**

100 * (BLK * (Tm MP / 5)) / (MP * (Opp FGA - Opp 3PA))

Block percentage is an estimate of the percentage of opponent two-point field goal attempts blocked by the player while he was on the floor.

**dRAT - Defensive Rating**

Points allowed per 100 possessions. This rating was developed by Dean Oliver, author of Basketball on Paper. Please see the article Calculating Individual Offensive and Defensive Ratings for more information.

**oRAT - Offensive Rating**

Points scored per 100 possessions. This rating was developed by Dean Oliver, author of Basketball on Paper. Please see the article Calculating Individual Offensive and Defensive Ratings for more information.

**USG% - Usage Rate**

100 * ((FGA + 0.44 * FTA + TOV) * (Tm MP / 5)) / (MP * (Tm FGA + 0.44 * Tm FTA + Tm TOV))

Usage percentage is an estimate of the percentage of team plays used by a player while he was on the floor.

**PER - Player Efficiency Rating**

PER is a rating developed by ESPN.com columnist John Hollinger. In John's words, "The PER sums up all a player's positive accomplishments, subtracts the negative accomplishments, and returns a per-minute rating of a player's performance." Please see this article on Calculating PER for more information.

**DRE - Daily RAPM Estimate**

DRE was developed by Kevin Ferrigan over at Nylon Calculus (basketball stat nerd website) to create an estimate of ESPN's super complex Real Plus-Minus (AKA Regularised Adjusted Plus-Minus or RAPM). Essentially DRE indicateds how many additional points are contributed to a team's scoring margin by a given player in comparision to the NBL-average player (whose adjusted plus-minus is 0) over the span of a game. For example a player with a DRE score of +2 is on the floor with 4 other average team mates, his team will average about 2 points better per game than 5 average players would.

**BPM - Box Plus Minus**

BPM is a *box score-based* metric for evaluating basketball players' quality and contribution to the team. BPM relies on a player's box score information and the team's overall performance to estimate a player's* performance relative to league average*. BPM is a

*per-100-possession*stat, the same scale as Adjusted Plus/Minus: 0.0 is league average, +5 means the player is 5 points better than an average player over 100 possessions

**VORP - Value Over Replacement Player**

VORP converts the BPM rate into an estimate of each player's overall contribution to the team, measured vs. what a theoretical "replacement player" would provide, where the "replacement player" is defined as a player on minimum salary or not a normal member of a team's rotation.