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Slugging average is the ratio of the total number of bases achieved on hits divided by the number of official times at bat. The variables used for hitterswere: batting average (ba), runs batted in (rbi's), slugging average (sa), runs scored (r), strike outs (so), stolen bases (sb), and fielding average (fa).
In baseball statistics, earned run average (ERA) is the mean of earned runs given up by a pitcher per nine innings pitched (i.e. the traditional length of a game).It is determined by dividing the number of earned runs allowed by the number of innings pitched and multiplying by nine.Runs resulting from defensive errors (including pitchers' defensive errors) are recorded as unearned runs and are not used to determine ERA.t is determined by dividing the number of earned runs allowed by the number of innings pitched and multiplying by nine. Runs resulting from defensive errors (including pitchers' defensive errors) are recorded as unearned runs and are not used to determine ERA.