Volatility is defined as the price range for a period, divided by the average price for the period:
So, to derive the Daily Volatility on 7/31/2009 of 3.9%, the price range for the day (1.63) was divided by the average price (41.19). The Daily Volatility is obtained by dividing the daily range by the daily average. A longer Volatility period such as Weekly Volatility is obtained by dividing the weekly price range by the weekly mean price. This is a different concept from the weekly average of daily volatility.
The red plot shows the actual price. Volatility, as measured through various intervals, ( Daily, Weekly, Monthly and Quarterly) is plotted according to color.
According to academic theory, Volatility is exactly equal to Risk. But investors often make a distinction between these two concepts. The different character of Volatility as seen in different time frames, lends some support to the investor's view. During 14 years, the Average Quarterly Volatility of PCZ stock price has been 25% while the Average Daily Volatility has been 2%.
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