Bubble charts and scatter diagrams
Use positioning and bubble size to analyse data.
▸ Elements in two dimensions
Source: Greenpeace
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They are used to visualize groups in two variables and verify if there is a correlation (or relationship) between values of two variables.
▸ Elements in three dimensions
Source: Greenpeace
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Bubble charts are used to compare elements in 3 dimensions. Please note that in these graphs it's important that the data relates with the bubble's area, not the diameter 1.