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A boxplot visualizes the distribution of a dataset. Although we show only one boxplot here for explanatory purposes, boxplots are particularly useful for comparative purposes. They are not helpful for small datasets. Boxplot calculations are based on fourths: the data values are divided in four groups, each with approximately the same number of values. To see an example, add a bunch of points to the boxplot by clicking. The turquoise box in the middle shows the middle 50% of the data values, i.e. the middle two groups, divided by the median line in the middle. The area below the box down to the lowest marking represents the bottom fourth of the data, while the area above the box up to the highest marking represents the top fourth of the data. Outliers are points that are more than one and a half times the interquartile range above the upper whisker or below the lower whisker. If any exist, they are marked in red.