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Term Definition
TENDEX
Author: Dave Heeren

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

The Tendex Formula=[(Points)+(Rebounds)+(Assists)+(Steals)+(Blocks)- (Missed Field Goal Attempts)-0.5*(Missed Free Throws)-(Turnovers)-(Fouls)]/(Player's Minutes)

Total Player Possessions
Author: Dean Oliver

#### The metric that represents a player's total possessions in the game. In other words,a player's total possessions is the total number of how many times he ends his team's possession.

Player's Total Possessions Formula=(Player's Scoring Possessions)+(Player's Non-Scoring Possessions)=(Player Field Goal Attempts)-(Player Missed Shots)*(Team Offensive Rebounding Percentage)+0.37*(Player Assists)-0.37*(Field Goals Made)*Q/R+(Player Turnovers)+0.4*(Player Free Throw Attempts)

Where;

Q=5*(Player Minutes)*(Team Assist Total)/(Team Total Minutes)-(Player Assists)
R=5*(Player Minutes)*(Team Field Goals Made)/(Team Minutes)-(Player Assists)

Touches
Author: Bob Chaikin

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.

Touches=Field Goal Attempts + Turnovers + (Free Throw Attempts / (Team's Free Throw Attempts/Opponents Personal Fouls)) + (Assists/0.17)

#### The estimate using a player's age and his approximate value to determine how much value a player has left in his career.

Trade Value Formula=[(Approximate Value- 27-0.75*Age )^2( 27-0.75*Age +1)*Approximate Value]/190+(Approximate Value)*2/13

#### The mathematical relationship between usage rate and efficiency.

Trade off between usage and efficiency explains the player's gain of offensive rating (points per 100 possessions) for drop of each percent of usage.

True Shooting Percentage

#### The metric that factors a player's performance at the free-throw line and considers their efficiency on all types of shots.

True Shooting Percentage Formula=(Player's Total Points)/[(2*(Player's Field Goal Attempts+ 0.44*Player's Free Throw Attempts)]

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