<P> In baseball statistics, home runs allowed per 9 innings pitched (HR / 9IP or HR / 9) or home runs allowed per nine innings (denoted by HR / 9) is the average number of home runs given up by a pitcher per nine innings pitched . It is determined by multiplying the number of home runs allowed by nine and dividing by the number of innings pitched . </P> <Table> <Tr> <Th_colspan="2"> (hide) <Ul> <Li> </Li> <Li> </Li> <Li> </Li> </Ul> Baseball statistics </Th> </Tr> <Tr> <Th> Batting </Th> <Td> <Ul> <Li> Batting average </Li> <Li> On - base percentage </Li> <Li> Slugging percentage </Li> <Li> Hit <Ul> <Li> Single </Li> <Li> Double </Li> <Li> Triple </Li> <Li> Home run </Li> <Li> Extra-base hit </Li> </Ul> </Li> <Li> Grand slam </Li> <Li> RBI </Li> <Li> Game - winning RBI </Li> <Li> Walk </Li> <Li> Bunt </Li> <Li> Sacrifice bunt </Li> <Li> Sacrifice fly </Li> <Li> On - base plus slugging </Li> </Ul> </Td> </Tr> <Tr> <Th> Base running </Th> <Td> <Ul> <Li> Run </Li> <Li> Stolen base </Li> <Li> Stolen base percentage </Li> <Li> Caught stealing </Li> </Ul> </Td> </Tr> <Tr> <Th> Pitching </Th> <Td> <Ul> <Li> Win--loss record </Li> <Li> Innings pitched </Li> <Li> Pitchers of record </Li> <Li> Save </Li> <Li> Hold </Li> <Li> Run <Ul> <Li> Earned </Li> </Ul> </Li> <Li> ERA </Li> <Li> Strikeout </Li> <Li> Walk </Li> <Li> Perfect game </Li> <Li> No - hitter </Li> <Li> WHIP </Li> <Li> BB / 9 </Li> <Li> K / 9 </Li> <Li> Quality start </Li> <Li> Complete game </Li> <Li> Shutout </Li> <Li> Wild pitch </Li> </Ul> </Td> </Tr> <Tr> <Th> Fielding </Th> <Td> <Ul> <Li> Fielding percentage </Li> <Li> Assist </Li> <Li> Putout </Li> <Li> Error </Li> <Li> Fielder's choice </Li> <Li> Defensive indifference </Li> <Li> Passed ball </Li> </Ul> </Td> </Tr> <Tr> <Th> Sabermetrics </Th> <Td> <Ul> <Li> Adjusted ERA+ </Li> <Li> Base runs </Li> <Li> Batting park factor </Li> <Li> Catcher's ERA </Li> <Li> Defensive Runs Saved </Li> <Li> Extrapolated Runs </Li> <Li> Game score </Li> <Li> Isolated Power </Li> <Li> Range factor </Li> <Li> Runs created </Li> <Li> Secondary average </Li> <Li> NERD </Li> <Li> Out of zone plays made </Li> <Li> Ultimate zone rating </Li> <Li> Weighted on - base average </Li> <Li> Wins Above Replacement </Li> <Li> Win probability added </Li> <Li> Win Shares </Li> </Ul> </Td> </Tr> </Table> <Tr> <Th_colspan="2"> (hide) <Ul> <Li> </Li> <Li> </Li> <Li> </Li> </Ul> Baseball statistics </Th> </Tr> <Ul> <Li> </Li> <Li> </Li> <Li> </Li> </Ul>

What is the average number of home runs per game