rollsd

-A function to compute the rolling standard deviation for a time series.

This is an R package implementing the epidemic volatility index (EVI), as
discussed by Kostoulas et. al. (2021) and variations by Pateras et. al. (2023). EVI is a new, conceptually simple, early warning tool for oncoming epidemic waves.
EVI is based on the volatility of newly reported cases per unit of time,
ideally per day, and issues an early warning when the volatility change rate exceeds a threshold.

Konstantinos Pateras  with contributions from Larisa Kosidou

Epidemic Volatility Index as an Early-Warning Tool

Eletherios Meletis

Konstantinos Pateras

Paolo Eusebi

Matt Denwood

Polychronis Kostoulas

rollsd function

<dl><dt>cases</dt>
<dd>the time series of the newly observed cases per unit of time (ideally per day).</dd>
<dt>lag_t</dt>
<dd>integer - the size of the rolling window for which the rolling standard deviation is calculated (minimum/default value = 7, maximum recommended value = 30).</dd></dl>

Arguments

Rolling standard deviation — rollsd

<dl>

<dt>cases</dt>
<dd>the time series of the newly observed cases per unit of time (ideally per day).</dd>


<dt>lag_t</dt>
<dd>integer - the size of the rolling window for which the rolling standard deviation is calculated (minimum/default value = 7, maximum recommended value = 30).</dd>

</dl>

rollsd: Rolling standard deviation

Description

Usage

Arguments

Examples