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Range factor
Range Factor (commonly abbreviated RF) is a baseball statistic developed by Bill James. It is calculated by dividing putouts and assists by the number of innings or games played at a given defense position.〔(Baseball-Reference.com (Fielding Stats Glossary) )〕 The statistic is premised on the notion that the total number of outs in which a player participates is more relevant in evaluating that player's defensive play than the percentage of cleanly handled chances as calculated by the conventional statistic fielding percentage.
However, some positions (especially first baseman) may have substantially more putouts because of a superior infield around them that commits fewer errors and turns many double plays, allowing them to receive credit for more putouts. Also, catchers who have a lot of strikeout pitchers on their team will have a high range factor, because the catcher gets the putout on a strikeout if the batter does not reach base.
==All Time Single Season Leaders==
:Note: ''All time single season leaders are listed according to Range Factor by games played (A + PO) / G. Yearly leaders listed above from 2001–present are listed according to Range Factor per nine innings 9
*(A + PO)/ Inn. Because the latter statistic is unavailable for older players, the former figure is used below to ensure use of comparable data for the all time single season leaders. The figures set forth below are verified from (Baseball-Reference.com ).''
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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