Typically used to show trends over time, the slope of the line between two points shows patterns of change.
Tutorials and Guides
How to Untangle a Spaghetti Line Chart (with R Examples)
Put multiple time series lines on the same plot, and you quickly end up with a mess. Here are practical ways to clean it up.
How to Make a Customized Excess Mortality Chart in Excel
Show current evolution against expected historical variability and add one or more series that could account for the difference.
How to Flatten the Curve, a Social Distancing Simulation and Tutorial
Using R, we look at how your decreased interaction with others can help slow the spread of infectious diseases.
How to Make Line Charts in Python, with Pandas and Matplotlib
The chart type can be used to show patterns over time and relationships between variables. This is a comprehensive introduction to making them using two common libraries.
How to Make a Bump Chart in R, with ggplot
Visualize rankings over time instead of absolute values to focus on order instead of the magnitude of change.
Visual tour through the technology hype cycle
The Gartner hype cycle is a graphical representation of where certain technologies are…
Covid-19, the third leading cause of death
For Scientific American, Youyou Zhou made a line chart that shows cause of…
Redefining Old Age
What is old? When it comes to subjects like health care and retirement, we often think of old in fixed terms. But as people live longer, it's worth changing the definition.
Visits to businesses compared year-over-year in each state
Businesses are still seeing visits mostly down compared to last year, which shouldn’t…
Analyzing the topics of cable TV news
From the Computer Graphics Lab at Stanford University, the results from an analysis…
Vote-by-mail volume compared against years past
The volume of mail-in ballots will likely be higher than usual this year,…
Finding the New Age, for Your Age
You've probably heard the lines about how "40 is the new 30" or "30 is the new 20." What is this based on? I tried to solve the problem using life expectancy data. Your age is the new age.
Defining ’90s music, based on song recognition
In search of songs that define music in the 1990s, Matt Daniels and…
Comparing U.S. coronavirus case rates to other hot spots
The numbers are high here in the United States, and at this point,…
Unemployment for different groups
Unemployment has hit the United States hard over the past several months, for…
Bitcoin scam, Twitter hacked
Twitter was hacked yesterday. Over a few hours, prominent accounts were tweeting that…
Restaurant Reopenings, a Comparison to Last Year
Restaurants are reopening for dining across the United States. Some states are doing it faster than others.
Occupation Growth and Decline
We looked at shifts in job distribution over the past several decades, but it was difficult to see by how much each occupation group changed individually. This chart makes the changes more obvious.
Saving for Retirement and Age
People tend to have more money saved up over time, but range and variation also grow, and often it’s not enough.
Bachelor’s Degree Movers
As industries change and interests shift, some bachelor's degrees grow more popular while others become less so.