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Visualization and Visual Communication, digested for you and presented by Robert Kosara

All (Line) Charts are Wrong, But Some Are Useful

Line charts are one of the most common and useful charts out there. But why draw straight lines between the data points? They almost never represent what the data is actually doing, no matter if the data is single observations or aggregated over time. How do line charts actually work, and what do they imply about the data?

eagereyesTV: Index Charts, Part 1: Making Time Series Data Comparable

To show change over time, you typically use a line chart. But when you’re comparing time series whose values are very different, the differences between the lines can obscure the changes within them. Index charts can help with that. They align values to a reference, or fold the time axis on itself, or even do […]