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» Bubble graphs from Statistical Modeling, Causal Inference, and Social Science
Junk Charts features these examples of pretty but not-particularly-informative bubble plots from the New York Times. If you like those, you'll love this beautiful specimen that Jouni sent me awhile ago. As Junk Charts puts it, "perhaps the only way... [Read More]

Comments

paul

The second chart certainly confused me when I read it in the paper ... I don't understand why the first two bubbles overlap.

Overlapping bubbles, to me at least, indicate that the set of people who get $70k overlaps with the set of people who get $140k. And yet there seems to be a hard break defining who gets which payout.

Maybe I'm reading it wrong.

Jett

While the numbers tell you the truth, the bubbles tell you a lie.

The radius is proportional to the value, but the brain perceives primarily the area, pi*r^2, so the lie factor (ratio of apparent effect to actual effect) for the illegal immigrants is (526000^2/22141^2)/(526000/22141) = 23.7

Which is too big

Matt

Regarding the illegal immigrants chart, if you measure the two charts, you'll see that the area is proportional to the value, not the radius.

So, the chart does accurately portray the relationships of the two numbers.

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