Sized Donut Multiples

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Sized Donut Multiples

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Last edited Feb 26, 2016

Created on Jan 21, 2016

A grid of donut charts shows the age distribution of each US state, with chart area scaled proportionally to total state population via `d3.scaleSqrt` and arcs sized by age cohort. The visualization uses `d3.pie` and `d3.arc` to generate SVG paths, while `selection.each` in a `multiple` function accesses both parent (state) and child (age) data simultaneously. Color encodes age categories through `d3.scaleOrdinal`, and a separate SVG legend lists the age bands. Data comes from `data.csv`, loaded with `d3.csv`.

AI-generated description

This example demonstrates how to use selection.each to create a context to access parent and child data simultaneously. The donut multiples are sized such that the area of each donut is proportionate to the total population, such that the area of the arcs is comparable across states.

This is a technical demonstration rather than a design recommendation; you probably don’t want to use this visual form. A normalized stacked bar chart is better at comparing the age distribution across states, and a stacked or grouped bar chart is better at comparing absolute values.

gpl-3.0 Licensed

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