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Disinterested Observer

Wouldn't such data be better represented with a Lorenz curve?


A real Lorenz curve can't be derived from the published data precisely because the outer brackets were defined as "less than X" and "more than Y". We can't then recover the total income for those brackets, and for obvious reasons, not being able to get the total income for the top bracket is highly problematic.

I first tried the next best thing, which is to keep the income brackets as the horizontal axis, and plotting the cumulative proportion of population as the vertical axis. Now, readers are forced to examine the vertical distance between two curves in order to understand which part of the distribution diverges from the national average. Thus, I came to this chart where the vertical distances are plotted directly.

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Marketing analytics and data visualization expert. Author and Speaker. Currently at Columbia. See my full bio.

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