# Torus

A great deal of information is captured in the torus!

At its simplest level it is essentially a pie chart.

- The *proportion* of the circle taken up by the red segment indicates the *Analysis %* of that node.

  A node which contains no analysis records will be completely blue.

  A node which contains all analysis records will be completely red.

  A node which has an *Analysis %* of 25% will be one quarter red.
- The *girth* of the torus represents how many of the people in the root node are contained within this node (i.e. the % of base).

  The root node will have a completely full torus, since it contains all the records.

  The leaf nodes will have a much finer torus, since they only contain some of the base records

## Node examples

The root node is a full torus since it contains all the records. The red band is narrow, representing the 2% of people in the analysis selection.

The left node (on the organic tree) contains the majority of people from the base selection (it is a wide torus), but has a narrower red band indicating the lower proportion of people in the analysis selection (*Analysis %* = 1%).

The right node (on the organic tree) contains relatively few people (narrow torus), but a higher proportion are in the analysis selection (wider red band).