Tag Archives: Interquartile range

Interquartile Range (IQR)

The interquartile range (IQR) is a measure of the spread of a distribution of a single quantitative variable. The IQR is a rather simple calculation and is merely the difference between (hence “range”) the upper quartile (Q3) and the lower quartile (Q1) (hence “inter” and “quartile”). For a better understanding of quartiles, here is a site […]


IQR, or Interquartile Range, is a robust measure of scale calculated by taking the third and the first quartiles in a set of data and subtracting them and is used in descriptive statistics. To find either of these quartiles, you must first find the median of  a set of numbers. These two halves then have […]