Adding Overlays

Overlays are a useful tool for comparing several distributions to each other on the same graph. In the context of defining an input distribution, adding an overlay enables comparison of the currently configured distribution to other distributions, each with their own configurations. Using this comparison, the appropriateness of distributions can better be determined.

Figure 1 - Add Overlay

From the Define Distribution window, overlays can be added to the graph by clicking the Overlays button in the Command Buttons area (Figure 1, right). This menu includes two options - 'Add Overlay' and 'Clear Overlay'.

Select 'Add Overlay' to open the Select Distribution window and choose an additional distribution to use in comparison. Double click the distribution icon or select it and click 'Select Distribution' to add that distribution to the graph.

The 'Clear Overlay' option will only be available if overlays have been added to a graph; select it to clear all overlays from the graph.

See Overlays in the Graphing section for more information on working with Overlays.