Secondary Average

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Secondary Average is a Bill James statistic, first introduced in the 1986 Baseball Abstract, that measures a player's offensive contributions in aspects not measured by Batting Average. It is calculated simply as the sum of extra bases, walks, and net steals per at bat, or:

(TB - H + W + SB - CS)/AB

James noted that league Secondary Averages tended to be similar to league Batting Averages, but that the range of individual performances was much wider.