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Average Recurrence Interval: Based on Desired Frequency. For example, Desired Frequency is 2 in 3 years, the Average Return Interval is 3/2 = 1.5 (x365 days) = 547.5 days.
Cumulative Spell Shortfall: Records the difference between the Cumulative Spell Target Volume and the Cumulative Spell Volume (actual). This is used to track success based on volume.
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