Key Concepts

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Box Plot Values

Usage of Side-by-side Box plots

Side-by-side Boxplots

Box Plot Outliers

Box Plot Whiskers

Boxplot in Matplotlib

Box Plot Values

The box in the box plot displays the dataset’s median, first and third quartile, and the interquartile range. The line in the center of the box shows the median, the edges shows the first and third quartiles, and the interquartile range is visualized by the width of the box.

Boxplots
Lesson 1 of 1
  1. 1
    Boxplots
    Boxplots are one of the most common ways to visualize a dataset. Like histograms , boxplots give you a sense of the central tendency and spread of the data. Take a look at the boxplot on this pag…
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  2. 2
    Median
    When making a box plot, the easiest place to start is the line that is inside the box. This line is the median of the dataset. Half of the data falls above that line and half falls below it. We …
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  3. 3
    Interquartile Range
    Now that we’ve drawn the median, let’s draw the edges of the box. The box extends to the first and third quartile of the dataset. This visually splits the data into fourths. One-quarter of the d…
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  4. 4
    Whiskers
    The whiskers of a boxplot display information related to the spead of the dataset. There are many different ways to plot the whiskers of a boxplot. You might see some boxplots where the whiskers …
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  5. 5
    Outliers
    The final piece of a boxplot is the representation of outliers. An outlier is a point in the dataset that falls outside of the whiskers. Outliers are usually represented with a dot or an asterisk.
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  6. 6
    Boxplots in Matplotlib
    We’ve spent this lesson building a boxplot by hand. Let’s now look at how Python’s Matplotlib library does it! The matplotlib.pyplot module has a function named boxplot(). boxplot() takes a datase…
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  7. 7
    Review
    Great work! Here are some of the major takeaways from boxplots: * The box of a boxplot visualizes the median, first quartile, and third quartile of a dataset. * The length of the box in a boxplot …
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