Forecasting on Covid-19 infection waves using a rough set filter driven moving average models.

A similar combination of a negative base with a negative trend will be stated as a down-trigger ( τ d w n ) or a drop ( d ).

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For the first positive base change ( β ) observed over a positive trend (T[D]) after an observation window of at least 7 days, an up-trigger ( τ u p ) will be marked.

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