Packed Circle Chart
Packed Circle Chart is great for visualizing hierarchical data. Circles on the bottom (leaf) level represent the values on that level and then they are packed (hence the name) into parent circles and determine their size. This way you can see a birds-eye view of the values in your data and also drill down for the details. Try clicking on the circles in the demo.
Key implementation details
Packed Circle Chart along with other hierarchical charts is covered by the hierarchy module of amCharts Charts. To add a Packed Circle chart we just create a Container and add a Pack child into it. Then we just need to add hierarchical data and configure the appropriate value fields.
Related tutorials
Demo source