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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 2/4/2010 of 1.4%, the price range for the day (0.42) was divided by the average price (28.83). 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. For reference, the price is plotted in red. The remaining marks on the plot correspond to the Volatility measured across several time intervals. Investors often make a distinction between the concept of Volatility, and the concept of Risk. Academics define them to be exactly equivalent, but as can be seen here, there is good reason to distinguish between the levels of volatility or risk experienced across different time frames. Average Daily Volatility over the history of VZ has been 2% in contrast to the Average Quarterly Volatility of 17%. |
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You may be familiar with the "yield curve" which shows how interest bearing yields vary according to term. Each Volatility Curve is a snapshot in time. As the timespan across which Volatility is measured increases, the Volatility is expected to increase. However, as seen in this plot of the VZ Volatility Curve, the increase is not constant. |
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This histogram is a frequency distribution of Daily Volatility, corresponding to the green points on the first chart on this page. |
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In a similar vein, the Frequency Distribution of the Quarterly Volatility is plotted here. This is the distribution of the values plotted in purple on the top chart from this page. |
Refined Volatility Risk Analysis for VZ : |
| Friday, February 05, 2010: We have news on Genzyme Corporation, ticker symbol GENZ. A significant moving average event has happened. Also, there are breaking events concerning Archer-Daniels-Midland and Pactiv Corporation. From the News Archive: (2/5/2010 ) Favorable events happened at Wells Fargo & Company, Marathon Oil Corporation, Dell Inc., and Principal Financial Group, Inc.. |