There are several measures in Easy Language:
Inputs: PriceValue(Numeric), SDevLen(Numeric):
StdDevPAnnualized
Variables: var0(True);
StdDevPAnnualized = StdDev(PriceValue, SDevLen) * BarAnnualization;
VolatilityStdDev
inputs: Length( 30 ) ;
Plot1( VolatilityStdDev( Length ), "VoltySDev" ) ;