In the illustration below, the majority of values are grouped in the 60s and 90s range, as shown in the histogram, but this is not as apparent from the boxplot representing the same dataset. For example, it can be hard to tell if your dataset is multimodal-meaning values cluster around more than one point-from a boxplot. A box and whisker plot is a representation of statistical data that displays information about the distribution of the values. In certain situations, boxplots can obscure important underlying information. If you are not presenting in a live setting, liberally annotating a boxplot (or iterating to a simpler chart type) can help viewers who might not otherwise understand how to interpret the graph.Īnother thing to be aware of is that a boxplot does not display the distribution of data as precisely as a histogram or other distribution charts. It’s always good to provide clarity and context through the thoughtful use of chart titles and annotations. Instead, narrate and animate the building of a boxplot as you present, walking your audience through the graph’s structure and the meaning of each metric. A complex chart type such as this can be overwhelming when presented all at once. Data points beyond the whiskers are displayed using +. The following figure shows the box plot for the same data with the maximum whisker length specified as 1.0 times the interquartile range. Narrate and build the chart piece-by-piece. Since the notches in the box plot do not overlap, you can conclude, with 95 confidence, that the true medians do differ. If you are presenting a boxplot, consider the following to make interpreting it easier: Choosing a different display altogether may avoid confusion for audiences who do not know this graph or how to analyze the statistics it depicts. Sometimes, the mean is also indicated by a dot or a cross on the box plot. The vertical line that split the box in two is the median. The box covers the interquartile interval, where 50 of the data is found. When should you not use a boxplot?Ī boxplot may be a familiar visual if you evaluate dataset statistics regularly, but this chart type is unfamiliar to many people, and it could introduce a learning curve for them. In a box and whisker plot: The left and right sides of the box are the lower and upper quartiles. The median Math score is lower than the other subjects, and none of the subjects have outliers or extreme test scores. In general, Art scores are higher and more closely grouped together. In this scenario, we can see that the range of scores is larger for English compared to Art.
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