A Box Plot, or Box and Whisker Diagram, is a summarizing visualization used to show the median, upper quartile, lower quartile, smallest observation and largest observation of statistical data, and sometimes indicates outliers with a point. The box plot was created by John Tukey. Box plots are frequently used to compare multiple data sets, and are oriented either horizontally or vertically. This vertical Box Plot compares employee salary across grades by gender, the blue symbols representing men and the red women in 2004. This diagram allows the user to see that the median salary is lower for women at all grade levels, but widens significantly as higher levels are achieved.
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