Epidemic Volatility Index as an Early-Warning Tool
Calculation of the convergence Epidemic Volatility Index
This function produces the Epidemic Volatility Index based output data...
This function is used after first running the deviant function
EVI: Epidemic Volatility Index as an Early-Warning Tool
This function produces plots of the time series data with the EVI pred...
Calculation of the Epidemic Volatility Index
Sensitivity-Specificity estimation for each cut-off value and rolling ...
Combining multiple epidemic volatility indices into a multi-early warn...
Issue of an Early Warning
Function that calculates the standard deviation
Function that calculates the moving average of a time series
Rolling standard deviation
A function that defines the true status based on the case definition
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.