| evi | R Documentation | 
Calculates the relative change in the standard deviation between two consecutive rolling windows.
evi(rollsd)
| rollsd | numeric vector - returned and stored as roll from the rollsd() function. | 
data("Italy")
cases = mova(cases=Italy$Cases)
roll = rollsd(cases=cases, lag_t=7)
ev = evi(rollsd=roll)
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