Box-and-Whisker Plot

A Histogram-like method of displaying data invented by J. Tukey (1977). Draw a box with ends at the Quartiles and . Draw the Median as a horizontal line in the box. Extend the whiskers'' to the farthest points. For every point that is more than 3/2 times the Interquartile Range from the end of a box, draw a dot on the corresponding top or bottom of the whisker. If two dots have the same value, draw them side by side.

References

Tukey, J. W. Explanatory Data Analysis. Reading, MA: Addison-Wesley, pp. 39-41, 1977.