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Comparative bubble chart

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Comparative bubble chart
Bubble map comparing landmass and population to measure population density. The outer bubble depicts area(sq km) and the inner bubble depicts population. The larger the inner bubble relative to the outer bubble, the higher the level of population density.
Visual types
Level of expertise
Source:
Herald daily, Nov 5, 2009 (News)
http://heralddaily.com/2009/11/05/land-mass-and-population-size-by-country/
Interactive features
None
Benefits & pitfalls to avoid
  • Using area or volume to represent data can distort data values, and exaggerate differences between values. For example, if the radius of the circle is used to represent data values, the area of the circle will quadruple if the data values double. There is also an issue of 'perceptual scaling' - the tendency of people to underestimate areas.
Create your own
  • Bubble charts can be created in a range of standard data applications such as Excel.