Bubble Chart
Updated 2026-08-13
INTRODUCTION
English translation pending.
CORE DEFINITION
A bubble chart extends the scatter plot by mapping a third variable to the area of each point, so position conveys two variables and size conveys a third. The core proposition is that human perception compares areas easily, so a third quantitative dimension can be added without abandoning the spatial relationships the scatter plot provides. The key qualification is that size must be mapped to area rather than to radius, since mapping to radius inflates apparent differences by the square of the ratio.
SCAFFOLDING EFFECT
Reduce cognitive load
- Variable assignment: choose which two variables take the axes and which one takes the size. - Area mapping: scale bubble area, not radius, to the third variable's value. - Overlap control: reduce or jitter overlapping bubbles so that density does not hide the pattern.
Anchor fast decisions
Position is the most accurately decoded visual channel, so the two axis variables remain readable while area carries the third. Area is decoded less precisely than position but is still ordered, which makes it adequate for comparing magnitudes. This division of labour lets one chart carry three variables without the reader having to switch between separate views.
MINIMUM ACTION
In progress 0/1Practice this model in one real situation:
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Source support: Explicit
- en.wikipedia.orghttps://en.wikipedia.org/wiki/Bubble_chartverified
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