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Dani's avatar

Given this formula:

Annual volatility = sqroot(Time periods) x daily volatility

When calculating annual variance we multiply by 251 (time periods). So when translating this into the annual std dev, we also have to sqrRoot time periods right? i.e this is the reason for squaring root the time periods no?

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Eugen Z's avatar

If we want to compare implied vol and historical vol, for historical vol: do we take sample std or population std (i.e divide by n or n-1)?

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