This menu is used for plotting data values that consist of directional observations recorded as angles
between 0 and 360 degrees. Once the data have been selected you can draw the graph by clicking on
Finish, alternatively, additional options can be set by clicking the
Next button.
Angles
Specifies a factor or variate containing the direction observations. If a variate is supplied, the
observations are grouped for plotting into sectors based on the width (in degrees) and centres specified
in the additional options. If a factor is supplied, its levels define the midpoints of the secto