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Sharpness
This protocol is extracted from research article:
Using digital surveillance tools for near real-time mapping of the risk of infectious disease spread
NPJ Digit Med, Apr 16, 2021;

Procedure

Sharpness is a measure of the spread (or uncertainty) of the forecasts. Adapting the definition proposed by Funk et al.71, we used the relative mean deviation about the median to evaluate sharpness. The sharpness $sjt$ of forecasts at time t at location j is

We add 1 to $I^jt$ to prevent division by 0. A sharpness score of k indicates that the average deviation of the predicted incidence trajectories is k times their median. Low values of sharpness therefore suggest that the predicted trajectories are clustered around the median.

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