Pie graphs use ‘pie slices’ to show relative sizes of data. The data they display adds to 100% and they are an effective way to display the part to whole relationship.
Pie graphs are most effective when they do not include too many categories of data as they are designed to show proportions at a glance, facilitating easy understanding.
In this article
1. Pie graphs
When one variable or axis is selected, in either the Down or Across drop zone, Harmoni displays a standard pie chart with pie slices. Create your table with one axis and from the Visualite menu, select the pie graph icon.
When two variables or axes are selected, creating a cross tab analysis, Harmoni displays the Down axis in the center of the pie chart and the Across axis around the outside of the pie graph. The center portion will add to 100% as will the outside portion of the pie graph and Harmoni automatically recalculates the correct percentages.
When pie graphs display data, the segments always add to 100%
The percentages displayed on the graph are share percentages
If the axis does not add to 100% or a selection of elements is made, Harmoni rebases the percentages so that they add to 100%
Change the number of decimal places using the drop down menu under the percent symbol next to REDRAW.
2. Display Settings
Down Drop Zone
Selecting a pie when an axis is in the Down drop zone will display the labels in a legend and a range of colors identify the segments.
Across Drop Zone
Selecting a pie graph when an axis is in the Across drop zone displays the labels next to the graph. A single hue with varying shades identifies the segments.
Table and Share Percentages
To show the table percentages on a pie graph, visualize the graph, then from the modify menu, select the show/hide table result icon (R). Table percentages will show in brackets, e.g. (10.05%), next to the share percentages.
If an axis that does not add to 100% is selected, or a subset of elements that do not add to 100% is selected, share percentages will differ from the table percentages.
You may not need to show all the elements in pie graph. By selecting only those required in your analysis table and using a pie graph, Harmoni will automatically reproportion the percentages based on only the elements selected.
When creating the table for your pie graph, select the column or row to rank, and select rank from the modify menu. The segments are ordered from highest to lowest. Click rank again to reverse the order.
When you select one variable, it's easy to change the order after creating the graph. Create the graph, open the modify menu, select rank, and the pie slices will reorder.
You can group elements with smaller percentages together as ‘Others’ to remove the clutter on the graph. Pie graphs are more effective with a smaller number of segments.
Change the number of decimal places showing in the share percentages by clicking the drop down menu under the percentage symbol.