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Value of a portfolio with a collar option and shares as function of a log return …?

I could use some help with a question I've been stuck with. It's stated as follows, A private investor owns a large quantity of shares of a single stock and is worried about the position being too ...
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Log returns and time

In calculating realized/historical vol for fx spot, my samples/fixings are currently every minute. I need to be able to calculate and plot historical/realized vol on demand from spot prices. ...