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Table 2 Definitions of different Epidemiologically Relevant features (Epi-features)

From: A framework for evaluating epidemic forecasts

Epi-feature name

Definition

Peak value

Maximum number of new infected cases in a given week in the epidemic time-series

Peak time

The week when peak value is attained

Total attack rate

Fraction of individuals ever infected in the whole population

Age-specific attack rate

Fraction of individuals ever infected belonging to a specific age window

First-take-off-(value):

Sharp increase in the number of new infected case counts over a few consecutive weeks

First-take-off-(time):

The start time of sudden increase in the number of new infected case counts

Intensity duration

The number of weeks (usually consecutive) where the number of new infected case counts is more than a specific threshold

Speed of epidemic

Rate at which the case counts approach the peak value

Start-time of disease season

Time at which the fraction of infected individuals exceeds a specific threshold