Player Efficiency Rating

The Player Efficiency Rating (PER) is a metric used to evaluate the efficiency of a basketball player in a game or season. It takes into account various statistics such as points, rebounds, assists, steals, and blocks, as well as errors like missed shots and turnovers. The formula used is a variation of the sum of statistics minus errors, divided by playing time in minutes and adjusted by a league factor.

The PER formula is: (PTS + REB + AST + STL + BLK - FGA - FTA - TO) / MIN × league_per, which can be simplified as (Stats - Errors) / MIN × 15. This means that PER is a measure that balances a player's positive and negative contributions on the court, adjusted for playing time. The result is a measure that can be used to compare players from different teams and leagues.

PER is particularly useful for evaluating players with different playing styles. For example, a player who excels in scoring and playmaking may have a high PER, while another player who excels in rebounding and defense may also have a high PER. This allows coaches and analysts to compare players from different positions and playing styles.

However, it's essential to be cautious when using PER, as it can be influenced by factors like team and playing style. Additionally, PER does not account for factors like defense and team chemistry, which are also important for a player's success.