2:37 AM
killnine
As mentioned in Part 1, to obtain Historical Volatility, we need to calculate the standard deviation of the price returns using historical data (which can be in terms of daily, weekly, monthly, quarterly or yearly) over a certain period.
Commonly, the daily price data for the period of 10 days, 20 days, or 30 days are used.
Theoretically, the formula to calculate Historical Volatility (i.e. standard deviation of % stock�s returns) is as follow:
After the standard deviation is calculated, we then need to annualize it.
To annualise the Standard Deviation resulted from formula (1) in order to get Historical Volatility...
