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Secondary average, or SecA, is a baseball statistic that measures the sum of extra bases gained on hits, walks, and stolen bases (less times caught stealing) depicted per at bat.〔James, Bill. ''The Bill James Historical Baseball Abstract''. New York: Villard Books, 1988.〕 Created by Bill James, it is a sabermetric measurement of hitting performance that seeks to evaluate the number of bases a player gained independent of batting average. Unlike batting average, which is a simple ratio of base hits to at bats, secondary average accounts for power (extra base hits), plate discipline (walks), and speed (stolen bases minus times caught stealing).〔"Career Leaders for Secondary Average." (''Baseball Almanac'' ). Baseball-Almanac. 2013. Web. 11 Nov. 2013.〕 Secondary averages have a higher variance than batting averages. ==Formula== The formula to calculate secondary average is: : where *''BB'' = bases on balls *''TB'' = Total bases *''H'' = Hits *''SB'' = Stolen bases *''CS'' = Caught stealing *''AB'' = At bats The resulting number rounded to the thousandth place is a player's secondary average. Variations to the formula exist, with some statisticians not counting caught stealing while others multiply caught stealing to increase its significance/negative effects. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Secondary average」の詳細全文を読む スポンサード リンク
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