![]() ![]() The median can be easily formulated when the dataset contains an odd number of values. ![]() The median is the quantity that falls in the middle when a set of values are arranged in an ascending or descending order. Although rare, some box plots do not have whiskers. The boxes can either be drawn vertically or horizontally depending on the goal of visualizing the data. That is, the rectangular bars(or boxes), top of the boxes indicating the upper quartile, the bottom of the boxes indicating the lower quartile, the centerline indicating the margin, and the line drawn from each end of the boxes is known as the whisker. The name, box and whisker plot is derived from the nature of the graph. It may also have line extensions extending from the boxes, which usually indicates variability beyond the upper and lower quartiles. Box Plot DefinitionĪ box plot is a statistical data visualization technique that uses rectangular bars to indicate data groups through their quartiles. There are different steps involved in this process, and it will be further explained in the rest of this article. Box & Whisker plots make use of the five-way summary (median, lower quartile, higher quartile, minimum, and maximum) when describing data. Some other methods that require calculation include a histogram, which needs a class interval and a pie chart that requires one to calculate the degree of each slice in the pie.Ĭomputations are no doubt a common occurrence in statistical analysis, but minimal when visualizing data. Box & Whisker plot is one of the few data visualization techniques that perform further computations on the dataset before it can be visualized. ![]()
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