Learn R: Quartiles, Quantiles, and Interquartile Range
In this course, you will learn how to calculate three important descriptive statistics that describe the spread of the data.
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Key Concepts
Review core concepts you need to learn to master this subject
Quantiles
Quartiles
Quantiles and Groups
Median in Quantiles
Interquartile Range Definition
Interquartile Range and Outliers
Quantiles
Quantiles
Quantiles are the set of values/points that divides the dataset into groups of equal size. For example, in the figure, there are nine values that splits the dataset. Those nine values are quantiles.
Quartiles
Lesson 1 of 3
- 2We’ll come back to the music dataset in a bit, but let’s first practice on a small dataset. Let’s begin by finding the second quartile (Q2). Q2 happens to be exactly the median . Half of the dat…
- 4You just learned a commonly used method to calculate the quartiles of a dataset. However, there is another method that is equally accepted that results in different values! Note that there is no …
- 5We were able to find quartiles manually by looking at the dataset and finding the correct division points. But that gets much harder when the dataset starts to get bigger. Luckily, there is a funct…
- 6Great work! You now know how to calculate the quartiles of any dataset by hand and with R. Quartiles are some of the most commonly used descriptive statistics. For example, You might see schools …
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Learn R: Quartiles, Quantiles, and Interquartile Range
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