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- duration (i.e. sorted descending)
- duration non exceedence (i.e. sorted ascending)
- moving average (with associated time span).
- central moving average (with associated time span).
the (central) moving average function only works for true equidistant data (i.e. no daysOfMonths etc.)
The difference between moving average and central moving average is that the central moving average takes uses values before and after the current one. Mving value to calculate the average. Moving average only uses values in the past.
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