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Vol_short and a long volatility Vol_long.
Vol_change=Vol_short/Vol_long |
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Standard deviation here is not that from a difference of closing prices, but from logarithms of the correlation of the current day closing price and closing price of a previous day: Mom[i]=Close[i]/Close[i+1].
Vol_k=Std(Mom,k),
where k is the period of volatility change.

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