The term MLB STATISTIC refers to four different statistics used in Major League Baseball: ERA (Earned Run Average), HRS (Home Runs), RBI (Runs Batted In), and ATBATS (At Bats). ERA is a statistic that measures the number of earned runs a pitcher gives up per nine innings. HRS is a statistic that measures the number of home runs hit by a batter. RBI is a statistic that measures the number of runs batted in by a batter. ATBATS is a statistic that measures the number of times a batter has gone up to bat.