Telebras (TBH) & Brazil Message Board

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Strategies & Market Trends : Telebras (TBH) & Brazil

TBH 0.597

+1.3%

12:59 PM EST

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To: Naveen Kumar who wrote (352)	11/8/1997 12:28:00 AM
From: Aaron Weiss	Read Replies (2) of 22640

I think the definition is the standard deviation in a stock's price over the past year's trading expressed as a percentage of the mean. So if you take the calculate the mean and SD of TBR's closing prices over the past year (about 250 trading sessions or so), the volatility would be given by SD/Mean. This volatility figure is the basis of all option valuation models which professional option traders use.

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