![]() Much more can be read from a boxplot than might be surmised from the simplistic method of its construction, The width across the page signifies nothing. The length of the box becomes its height. Most statistical packages seem to produce them vertically by default, as shown on the right, rather than horizontally. The following diagram shows a dotplot ofĪ sample of 20 observations ( actual sample values used in the display) together withĪlthough boxplots can be drawn in any orientation, TheĬrossbar at the far end of each whisker is optional and its length ![]() Of the box until they reach the sample maximum and minimum. A line is drawnĪcross the box at the sample median. Of the box does not represent anything in particular. Of the plot is a rectangle which encloses the middle half of the sample, with an end at each quartile. There are two potential outliers in distribution A.In its simplest form, the boxplot presents five sample statistics - the minimum, According to the definition used by the function in R software, all values higher than Q3 + 1.5 x (Q3 - Q1) = 0.32 + 1.5 x 0.30 = 0.77 are outside the right whisker and indicated by a circle. The distribution C is negatively skewed because the whisker and half-box are longer on the left side of the median than on the right side.Īll three distributions include potential outliers. ![]()
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