Interactive Brokers and historical volatility

IB use 20-day exponentially weighted moving average calculation for futures historical volatilities. For stocks IB use GarmanKlass simple moving average calculator that takes into consideration high/low/open/close values for the past 30 days.

IB has not yet informed me, which formula they use for ETFs like SPY.
 
For ETFs IB also use Garman-Klass simple moving average calculator that takes into consideration high/low/open/close values for the past 30 days.
 
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