A heatmap is a literal way of visualizing a table of numbers, where you substitute the numbers with colored cells. This is a quick way to make one in R.
2010 January 21
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Second Edition
Visualize This: The FlowingData Guide to Design, Visualization, and Statistics (2nd Edition)
Visualize This: The FlowingData Guide to Design, Visualization, and Statistics (2nd Edition)
New tools, refined process.
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