Quality and Reliability Methods - SAS

Chapter 15 Recurrence Analysis 265
Examples
Figure 15.2 Partial Engine Valve Seat Data Table
Complete the launch dialog as shown previously in Figure 15.1.
When you click OK, the Recurrence platform shows the reports in Figure 15.3 and Figure 15.4. The MCF
plot shows the sample mean cumulative function. For each age, this is the nonparametric estimate of the
mean cumulative cost or number of events per unit. This function goes up as the units get older and total
costs grow. The plot in Figure 15.3 shows that about 580 days is the age that averages one repair event.
Figure 15.3 MCF Plot and Partial Table For Recurrence Analysis
The event plot in Figure 15.4 shows a time line for each unit. There are markers at each time of repair, and
each line extends to that unit’s last observed age. For example, unit 409 was last observed at 389 days and
had three valve replacements.