Basics
These articles cover the fundamentals: data, techniques, statistics, etc.
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How The Rainbow Color Map Misleads
Colors are perhaps the visual property that people most often misuse in visualization without being aware of it. Variations of the rainbow colormap are very popular, and at the same time the most problematic and misleading.
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Aspect Ratio and Banking to 45 Degrees
The same data can look very different in a line chart depending on its aspect ratio. But what is the perfect shape for a chart? A square? A rectangle? Which rectangle? It depends on the data.
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Continuous Values and Baselines
One of the most common mistakes people make when creating charts is to cut off the vertical axis. But why is that a problem? And what can you do when you need to show data where the amount of change is small compared to the absolute values?