From SABR member John Dewan at ACTA Sports on December 23, 2016:
Which outfielders had the best arms throughout the 2016 season? To answer this question, we use Outfield Arm Runs Saved. This metric evaluates fielders’ arms by considering both their ability to throw out baserunners without the use of a relay man—Outfield Kills—and the percentage of the time a baserunner attempts to take an extra base on that given fielder (XBT%).
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Originally published: December 23, 2016. Last Updated: December 23, 2016.