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quartile

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Quick Summary

A quartile is a statistical measure that divides a data set into four equal parts. These divisions are based on values that represent the 25th, 50th (median), and 75th percentiles of the data.12

  • First Quartile (Q1): The value below which 25% of the data falls.2
  • Second Quartile (Q2): The median, below which 50% of the data falls.2
  • Third Quartile (Q3): The value below which 75% of the data falls.2

Quartiles help in understanding the spread and central tendency of data, and are often visualized using box-and-whisker plots. The quartile deviation is half the difference between the third and first quartiles.23

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  2. quartile deviation
  3. box-and-whisker plot

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