4.2.2 Boxplot

In descriptive statistics, a box plot or boxplot is a method for graphically depicting groups of numerical data through their quartiles.

Box plot describes data distribution with 5 measures. Generally, these five numbers illustrate a lot of information about the distribution of a variable.

Interquartile range (IQR): 25th to 75th percentile

  • minimum (Q1 - 1.5 * IQR)

  • first quartile (Q1/ 25th percentile),

  • median (50th percentile)

  • third quartile(Q3 / 75th percentile)

  • maximum. (Q1 + 1.5 * IQR)

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