Editing Pie chart (section)

==={{anchor|Ring}}Ring chart, sunburst chart, and multilevel pie chart===
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[[Image:Disk usage (Boabab).png|thumb|right|Multi-level pie chart representing disk usage in a [[Linux]] file system]]
{{See also|Radial tree}}
A ring chart, also known as a [[sunburst]] chart or a multilevel pie chart, is used to visualize hierarchical data, depicted by concentric circles.<ref>{{Cite web|url=http://www.neoformix.com/2006/MultiLevelPieChart.html|title=Multi-level Pie Charts|website=www.neoformix.com}}</ref> The circle in the center represents the root node, with the hierarchy moving outward from the center. A segment of the inner circle bears a hierarchical relationship to those segments of the outer circle which lie within the angular sweep of the parent segment.<ref>Webber Richard, Herbert Ric, Jiangbc Wel. "Space-filling Techniques in Visualizing Output from Computer Based Economic Models"</ref>