what is the interquartile range of a data set 
the interquartile range is the middle 50 of measurements in a data set in other words the range of data between the upper quartile and the lower quartile this is more statistically meaningful than using the full range of data because it omits possible outliers the bottom linequartiles are values that split lists of datasets into quarters resulting in lower middle and upper quartiles the purpose of quartiles is to give shape to a distribution primarily indicating whether or not a distribution is skewed which can be used to determine the consistency of a fund s performance 