DATA VISUALIZATION NOTES · SINCE 2013
Practical methods and examples around data visualization.
LATEST · 2026.08.18
Who made the lollipop chart, and for what?
Andy Cotgreave named and popularized the lollipop chart in 2011, as a way to reduce the ink and visual weight of many long bars. The form itself has a precursor in Cleveland’s dot charts.
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What Is a Bar Chart Race?
A bar chart race is an animated form of bar chart that shows data changing over time, turning changes in rank and value into something that reads like a race.
Gridded Cartogram
A gridded cartogram represents each region as an equally sized grid cell, such as a square or hexagon, while roughly preserving geographic arrangement.
Pseudo-Continuous Cartogram
A pseudo-continuous cartogram replaces geographic regions with geometric shapes such as circles, squares, or hexagons, and sizes those shapes in proportion to a data variable.
Non-Continuous Cartogram
A non-continuous cartogram scales each region independently in proportion to a data variable while preserving the original shape of that region.
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