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.