Diagram in the form of a
circle in which each modality of a
distribution of the data of a qualitative statistical variable occupies one
sector of the
circle (identified by a percentage or a fraction) where the area is proportional to the
frequency of the
modality.
Example
Here is some data we gathered by surveying students in a class to find out the number of brothers and sisters in each family.
These data are represented on the right in a circle graph.

