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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