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This chart shows Volatility for National City Corporation, defined to be the price range as a portion of the average price: For instance, on 12/31/2008 the average price was 1.86 with a range of 0.17, indicating a Daily Volatility of 9.1%. 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. 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. Average Daily Volatility over the history of NCC has been 2% in contrast to the Average Quarterly Volatility of 22%. |
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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. 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 NCC : |
| In the news, Wednesday, March 10, 2010: An unfavorable condition has developed with Valero Energy Corporation, ticker symbol VLO. Also, there are breaking events concerning Vulcan Materials Company (VMC) and XTO Energy Inc. (XTO) |