Overlay Plots

The software gives you the ability to place more than one data sheet on a plot using an overlay plot. Data may come from standard folios, warranty analysis folios or degradation folios. (Note that you can include parametric RDA folios in an overlay plot but only with other parametric RDA folios.) To add an overlay plot to a project, choose Insert > Reports and Plots > Overlay Plot.

When you add a new, blank overlay plot to a project, you must first select the data sheets in the Select Data Sheets window and select which plots you want to include. Many of the functions in an overlay plot are similar to those in a standard plot.

What’s Changed? In previous versions of the software, overlay plots were known as MultiPlots.

Plot Types

The following plot types are available in an overlay plot.

Weibull++ Data Sheets Only	ALTA Data Sheets Only	Weibull++ and ALTA Data Sheets
Standard folios, warranty analysis folios or degradation folios Probability* Reliability vs. Time Unreliability vs. Time Pdf Pot Failure Rate vs. Time Contour Plot*	Use Level Probability* Probability* Reliability vs. Time Unreliability vs. Time Pdf Plot Failure Rate vs. Time Life vs. Stress* Std vs. Stress* AF vs. Stress* Standardized Residuals* Cox-Snell Residuals Standard vs. Fitted Value*	Use Level Probability* Probability* Reliability vs. Time Unreliability vs. Time Pdf Plot Failure Rate vs. Time
Parametric RDA folios Cumulative Number of Failures Cumulative Failure Intensity vs. Time Instantaneous Failure Intensity vs. Time Conditional Reliability vs. Time Conditional Unreliability vs. Time
* All data sets must be calculated using the same distribution for these plots to be available; otherwise these plots are not available.

You can include Weibull++ data sheets and ALTA data sheets in the same overlay plot. This can useful, for example, if you have created a prediction data sheet in ALTA and you have the real data in a Weibull++ data sheet and you want to compare how the predicted values match up to the real life data.