Typically used to show trends over time, the slope of the line between two points shows patterns of change.
Tutorials and Guides
How to Make Small Multiples in Excel
Also known as trellis charts, lattice chart, or whatever you want to call them, the technique lets you compare several categories in one view.
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.
Rate of change in Covid-19 cases
We’re all familiar with the Covid-19 line charts that show cases over time,…
Falling spin rates in baseball after rule enforcement
NYT’s The Upshot analyzed spin rate on pitches before and after enforcing a…
Divorce Rates and Income
Divorce rates are tied to job security, age, and occupation, so it should make sense that we see a pattern when we plot divorce rates against income.
How your state might lose or gain representation with Census count
Harry Stevens, Tara Bahrampour and Ted Mellnik for The Washington Post look at…
Tooth Fairy Exchange Rate
Calculating how much money a kid gets after exchanging all twenty baby teeth.
Improving vaccine distribution in all states
Lauren Leatherby and Amy Schoenfeld Walker reporting for The New York Times: “Every…
Spike past 100k Covid-19 cases in a day
Meanwhile… based on estimates from The COVID Tracking Project, the United States had…
Political search interest in 2020
In Waves of Interest, a collaboration between the Google News Initiative and Truth…
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,…