Using pie charts
Pie charts are useful for illustrating how individual parts contribute to an overall whole set. They help when there are only a few categories. This map shows you the relative proportion of people in particular age classes by county. Younger age classes are shown in green.
Charts are most effective when mapping no more than 30 features. Otherwise, the patterns on the map will be difficult to see. Typically, use just a few categories on a chart.
- Right-click the layer you want to draw showing quantitative values using pie charts and click Properties.
- Click the Symbology tab on the Layer Properties dialog box.
- Click Charts and click Pie.
- Under Field Selection, click the numeric field(s) that you want to map. Then, use the arrow buttons to add and remove fields in the field list.
- Use the Color Scheme drop-down list to select the color ramp that you want to use.
- If you want to prevent overlapping charts, check the Prevent chart overlap box.
- Optionally, you can click the Exclusion button and use a SQL expression to exclude values (such as outliers).
- Click Size.
- Click OK.
You can double-click an individual symbol in the list to change its properties.