Trends und Entwicklungen

Import the following Databricks notebook with instructions and examples into your account:

https://s3.us-east-1.amazonaws.com/nicolas.meseth/databricks-notebooks/visualize_developments_and_trends_with_ggplot2.htmls3.us-east-1.amazonaws.com

Ordered Scatter Plots

When we visualize trends, we need at least one of the two variables to have a natural order. The typical example is a date or time variable. The analysis of a dependent variable over time is called time-series analysis.

The simplest way to display a development over time is to use a scatter plot. Instead of arbitrary two variables, we order the x-axis by the values of the first variable (e.g. date, time), and plot along the corresponding y-values.

Line Charts

"Line graphs are not limited to time series, however. They are appropriate whenever one variable imposes an ordering on the data." [1]

Multiple Series

Area Charts

Facets

A 3 x 3 matrix of line charts.

Pitfalls

Cut or not to cut the y-axis?

References

[1] Wilke, C. Fundamentals of Data Visualization: A Primer on Making Informative and Compelling Figures. First edition, O’Reilly Media, 2019. Chapters 13 and 14.