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Sometimes also referred to as the "frequency" of an event.
Interval diagrams can be mapped along planning horizons or along deterioration curves.
Types of Intervals
It is generally recognized in the asset management literature that there are four broad classes of intervals, summarized as follows:
Fig. Two primary methods of displaying intervals: a) along a planning horizon and b) along a deterioration curve.
Fig 1. Single Interval (one-time) event
Fig 2. Fixed intervals - uniform
Fig 3. Fixed intervals - clustered
Fig 4. Variable intervals
Fig 5. Logarithmic intervals
Fig. 6. Floating intervals
Fig 7. Overlapping intervals
Fig. Variable interval events mapped onto the P-F curve to illustrate the relationship between time and condition.
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