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This chart shows Volatility for Exxon Mobil, defined to be the price range as a portion of the average price: So, to derive the Daily Volatility on 2/5/2010 of 2%, the price range for the day (1.34) was divided by the average price (64.23). 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. 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 30 years, the Average Quarterly Volatility of XOM stock price has been 15% while the Average Daily Volatility has been 2%. |
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You may be familiar with the "yield curve" which shows how interest bearing yields vary according to term. These Volatility Curves each apply to a discrete time interval. 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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Similarly, the purple points on the top chart, the Quarterly Volatility Values, are subjected to frequency distribution here. |
Refined Volatility Risk Analysis for XOM : |
| Thursday, February 04, 2010: We have news on MicroSoft, ticker symbol MSFT. Some signs of an over-sold condition have become evident. Also, there are breaking events concerning Polo Ralph Lauren Corporation and Eastman Kodak. From the News Archive: (2/3/2010 ) Favorable events happened at C.H. Robinson Worldwide, Inc., PNC Financial Services, and Briggs and Stratton. Meanwhile, bad news came from Northrop Grumman Corporation. |