Five-number Summary

The five-number summary is a descriptive statistic that provides information about a set of observations. It consists of the five most important sample percentiles:

  1. the sample minimum (smallest observation)
  2. the lower quartile or first quartile
  3. the median (middle value)
  4. the upper quartile or third quartile
  5. the sample maximum (largest observation)

In order for these statistics to exist the observations must be from a univariate variable that can be measured on an ordinal, interval or ratio scale.

Read more about Five-number Summary:  Use and Representation, Example

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