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The Composite Score rating system consists of two components, Offensive Composite Score (OCS) and Defensive Composite Score (DCS). Each is made up of a combination of three advanced statistical metrics and then adjusted based on a player’s position and playing time. The rating system is always under construction, so the system used today may not be as good as one you could see in a few weeks. First, let me explain OCS. It is a combination of three statistics: the Offensive rating system developed by Dean Oliver (which can be found at basketballreference.com), PER production (found on the team pages at 82games.com), and offensive plusminus, found at basketballvalue.com. I then adjust offensive rating and PER production for position. Next, I add up the three zscores for the three stats for each player and multiply them by 10. After adjusting for playing time (whether or not most of it is against starters or benchwarmers), Offensive Composite Score is complete. Offensive ratings are an incredible measure of efficiency. PER also measures efficiency but takes into account players with higher usage rates. +/ is a great indicator of how well a player is fitting into his team and helping them offensively. The average score is set at 0.
Player rank percentiles were also included to get a relative value of each player. Next is an explanation of DCS. DCS uses the mirror statistics of the three used for OCS. Instead of Offensive rating, it uses a very similar Defensive rating. Instead of PER, it uses counterpart PER, which is basically the PER accumulated by a player’s defensive matchups. Finally, instead of offensive plusminus, I use defensive plusminus. The scores are on the same scale as OCS. Composite Score (CS) is a combination of OCS and DCS. Counterpart PER, and PER were found at 82games.com. PER, or Player Efficiency Rating, was developed by John Hollinger. Offensive and defensive ratings, which were developed by Dean Oliver, were obtained from basketballreference.com. Plusminus can be found at basketballvalue.com and 82games.com. Player names and positions were obtained from dougstats.com. I used an adjustment for starters based on the formula developed at the APBRmetrics message board (http://sonicscentral.com/apbrmetrics/index.php). Glossary of terms on stats pages: OCS – Offensive Composite Score Tips for Interpreting Composite Score Rankings
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