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What we will learn
1. Introduction
Know your problem
Know your data
Visualize your data - bar chart
Work with your chart
Check yourself


In this chapter, we will focus on visualizing change over time. We will learn to plot data in a way that clearly shows the rise and fall of values over time.

After completing this chapter, we will know how to create a line chart. We'll also know when to use a bar chart to visualize time series data. As you can see in the image below, sometimes either a line or a bar chart can be used effectively for this problem. Which one you choose will depend on the nature of our data and the story we want to tell with it.

line chart