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.
Start
Key Concepts
Review core concepts you need to learn to master this subject
Quartiles
Quantiles
Quantiles and Groups
Median in Quantiles
Interquartile Range Definition
Interquartile Range and Outliers
Quartiles
Quartiles
The three dividing points (or quantiles) that split data into four equally sized groups are called quartiles. For example, in the figure, the three dividing points Q1, Q2, Q3 are quartiles.
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 …
What you'll create
Portfolio projects that showcase your new skills
How you'll master it
Stress-test your knowledge with quizzes that help commit syntax to memory