![]() These quartiles are denoted by Q 1 (also called the lower quartile), Q 2 (the median), and Q 3 (also called the upper quartile). To calculate the IQR, the data set is divided into quartiles, or four rank-ordered even parts via linear interpolation. ![]() ![]() It is defined as the difference between the 75th and 25th percentiles of the data. The IQR may also be called the midspread, middle 50%, or H‑spread. In descriptive statistics, the interquartile range ( IQR) is a measure of statistical dispersion, which is the spread of the data. Boxplot (with an interquartile range) and a probability density function (pdf) of a Normal N(0,σ 2) Population
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