D3.js, or Data-Driven Documents, version 4.0 was released a few months ago, so Jim Vallandingham updated his tutorial for categorized bubble charts to use the new version of the library. I’ve been slow getting to the new d3.js, but maybe this’ll move things along.
Floaty bubble charts with d3.js
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Percentage of Households in Each Income Level
What percentage of households fall into lower-, middle-, and upper-income levels when you adjust for household size?