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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 2/5/2010 of 4.1%, the price range for the day (0.69) was divided by the average price (16.69). Daily Volatility (the daily range as a portion of the daily average price) is plotted in green. Blue is Weekly Volatility, which is the weekly range as a portion of the weekly average 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. During 13 years, the Average Quarterly Volatility of TLM stock price has been 28% while the Average Daily Volatility has been 3%. |
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If you have ever seen a "yield curve" you should be able to understand the concept behind this "yield curve". These Volatility Curves each apply to a discrete time interval. As the timespan across which Volatility is measured increases, the Volatility is expected to increase. The relationship between the length of time, and the expected change in price, is not linear, as is demonstrated by this chart. |
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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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Similarly, the purple points on the top chart, the Quarterly Volatility Values, are subjected to frequency distribution here. |
Refined Volatility Risk Analysis for TLM : |
| 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.. |