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Volatility : Trading Formulae
Issued on September 06 2011 par Strategies-options.com

An asset moves and its volatility is zero ? Can't it be true ?
As far as an asset is moving, there is volatility.
Well, it depends on the kind of formula you choose.

Here is the path of an asset.


There is volatility because one can see the movement is not linear.

If one takes into account its closing prices:


Academic formula gives:


What a surprising outcome ? Volatility is 0 !

No! The point is that closing prices made daily returns be equal to the mean. In other words, every day the returns are 1% and the mean is therefore 1%. Thus the spread between daily returns and mean is zero every day, thus a standard deviation that is 0 !


Without taking into account the mean, one gets the right result. Daily returns are 1%, say an annualized volatility of 19%:





Next : Parkinson Volatility
Previous : Volatility : Let's Price It !

OPTIONS 101 - INDEX
OPTIONS 101 - CHAPTER I
OPTIONS 101 - CHAPTER II
OPTIONS 101 - CHAPTER III
OPTIONS 101 - CHAPTER IV
OPTIONS 101 - CHAPTER V
OPTIONS 101 - CHAPTER VI

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