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In descriptive statistics, the interquartile range (IQR), also called the midspread or middle fifty, is a measure of statistical dispersion, being equal to the difference between the upper and lower quartiles, IQR = Q 3 â Q 1.nlike total range, the interquartile range has a breakdown point of 50%, and is thus often preferred to the total range. The IQR is used to build box plots, simple graphical representations of a probability distribution.
How to Find the IQR. IQR stands for Interquartile Range, and it is used in statistical analysis to help draw conclusions about a data set. It is often preferred over the range in measuring the spread of a data set, because it excludes most outliers.You can learn how to find the IQR by reading the following:QR stands for Interquartile Range, and it is used in statistical analysis to help draw conclusions about a data set.