Quality and Reliability Methods - SAS

Chapter 18 Reliability Growth 327
The Reliability Growth Report
Figure 18.6 Observed Data Report
Cumulative Events Plot
This plot shows how events are accumulating over time. The vertical coordinate for each point on the
Cumulative Events plot equals the total number of events that have occurred by the time given by the
point’s horizontal coordinate.
Whenever a model is fit, that model is represented on the Cumulative Events plot. Specifically, the
cumulative events estimated by the model are shown by a curve, and 95% confidence intervals are shown by
a solid band. Check boxes to the right of the plot enable you to control which models are displayed.
Mean Time Between Failures Plot
The Mean Time Between Failures plot shows mean times between failures averaged over small time intervals
of equal length. These are not tied to the Phases. The default number of equal length intervals is based on
the number of rows.