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Why Do We Visualize Quantitative Data?

We visualize quantitative data to perform three fundamental tasks in an effort to achieve three essential goals: to explore, make sense of, and communicate data.

But why is it that we must sometimes use graphical displays to perform these tasks rather than other forms of representation? Why not always express values as numbers in tables? Why express them visually rather than audibly? Essentially, there is only one good reason to express quantitative data visually: some features of quantitative data can be best perceived and understood, and some quantitative tasks can be best performed, when values are displayed graphically. This is so because of the ways our brains work. Vision is by far our dominant sense. We have evolved to perform many data sensing and processing tasks visually.

Source: perceptualedge.com
Author: Stephen Few

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