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Volatility is defined as the price range for a period, divided by the average price for the period: For instance, on 2/4/2010 the average price was 37.72 with a range of 0.71, indicating a Daily Volatility of 1.8%. 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. It is important to avoid confusing this with the weekly average of the daily volatility, which is a completely different concept. 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 15 years, the Average Quarterly Volatility of DRI stock price has been 27% 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". Each Volatility Curve is a snapshot in time. From left to right, each position plots the Volatility associated with increasing intervals of time. 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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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 DRI : |
| Monday, February 08, 2010: We have news on American International Group, Inc., ticker symbol AIG. Some signs of an over-sold condition have become evident. Also, there are breaking events concerning Nicor Inc. and Archer-Daniels-Midland. From the News Archive: (2/5/2010 ) Favorable events happened at Regions Financial Corporation, Marathon Oil Corporation, and Pactiv Corporation. Meanwhile, bad news came from Genzyme Corporation. |