Event plot for Parametric Growth Curve

Use the event plot to compare systems and to determine whether successive failure rates are increasing, decreasing, or remaining constant. The event plot consists of the following:
  • Horizontal lines that represent the lifetime of each system
  • Data points that represent the failure and retirement times of each system
  • Frequency values (if you provide a frequency column) that represent the frequency of failure at each time

Example output


For the air conditioning data, the event plot indicates the following:
  • The first failure/repair occurred at approximately 20 days. System 1 was retired at approximately 400 days.
  • The time between successive failures (or repairs) appears to be constant for all systems. The times between failures do not show an increasing or decreasing trend.
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