Whatever credit the fielder may receive or lose on a play is based on where they were standing when the ball was hit, rather than simply assuming they were standing in a traditional starting location. Positioning has been effectively removed from a player’s DRS total on the premise that teams now control where a player is standing more than the player does. The primary benefit of this is that players can be credited for what they can actually control. The PART System utilizes the starting positioning data collected by SIS to separate a fielder’s positioning from everything else they do on the play. Thus, what was becoming a large gap in individual player defensive evaluation has effectively been filled, all the while opening the door for greater and more in-depth analysis. Rather than exclude plays where fielders are lined up dramatically differently from a traditional alignment, the PART System is able to handle these plays by incorporating the fielder’s starting position into the calculation of his Runs Saved on the play. In an era where shifting was still a rarity, this decision made sense, but now that teams are shifting on nearly half of all balls in play (and showing no signs of slowing down), a different approach has become necessary to continue accurately and completely evaluating players. At the time, the solution was to eliminate these shift plays from consideration when evaluating a fielder’s contributions, and instead calculate Shift Runs Saved at the team level. Because of this, he was making plays in “zones” that no other third baseman could and receiving tremendous amounts of credit as a result. In 2012, SIS realized that this increase in shifts was skewing individual player numbers-the example cited was Brett Lawrie, a third baseman who was often stationed in short right field when the team shifted its fielders. In 2010, less than 2% of all balls in play featured a shift being employed by the fielding team, per SIS charting. One of the primary reasons for the development of this new system was the massive increase in shift usage in recent years, since DRS had not included shift plays in its analysis of players before this update. This differs from its predecessor, which calculated and reported a fielder’s positioning, range and throwing contributions as a single number. (Outfielders will continue to be evaluated using the Range and Positioning System.) This article focuses specifically on this new component, although further explanations and descriptions for the others can be found in the original DRS Glossary entry or at .Īt its core, the PART System’s goal is to split a fielder’s contributions into its individual components. The PART System has replaced the Range and Positioning System (formerly known as the Plus/Minus System) as the primary component of DRS for infielders for all seasons since 2013. ![]() ![]() ![]() It is currently referenced as rPM on player, team, and leaderboard pages on Fangraphs. Therefore, the new system is called the PART System, which stands for Positioning, Air balls, Range and Throwing. Knowing where infielders started on the play allows us to separate out their Positioning from their other contributions on a play, namely their Range and their Throwing.
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