Graphs / Plots

Comparisons, Distribution, Patterns, Range

What is it?

A Box and Whisker Plot (or Box Plot) is a convenient way of visually displaying the data distribution through their quartiles. Box Plots can be drawn either vertically or horizontally.

The lines extending parallel from the boxes are known as the “whiskers”, which are used to indicate variability outside the upper and lower quartiles. Outliers are sometimes plotted as individual dots that are in-line with whiskers.

Two of the most commonly used variation of Box Plot are: variable-width Box Plots and notched Box Plots.

When to use it?

Although Box Plots may seem primitive in comparison to a Histogram or Density Plot, they have the advantage of taking up less space, which is useful when comparing distributions between many groups or datasets.

Box Plots are helpful in making observations like:
– the key values like the average, median, 25th percentile, etc.
– identify any outliers and what their values are.
– if data is symmetrical or not.
– How tightly is the data grouped.
– If the data is skewed and if so, in what direction.

Tools to create the Charts

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