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This chart shows Volatility for Pinnacle West Capital Corporation, defined to be the price range as a portion of the average price: For instance, on 8/31/2010 the average price was 39.76 with a range of 0.57, indicating a Daily Volatility of 1.4%. 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. The red plot shows the actual price. Volatility, as measured through various intervals, ( Daily, Weekly, Monthly and Quarterly) is plotted according to color. 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 PNW has been 2% in contrast to the Average Quarterly Volatility of 18%. |
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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. As the timespan across which Volatility is measured increases, the Volatility is expected to increase. However, as seen in this plot of the PNW 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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Similarly, the purple points on the top chart, the Quarterly Volatility Values, are subjected to frequency distribution here. |
Refined Volatility Risk Analysis for PNW : |
| Tuesday, September 07, 2010: We have news on Brocade Communications Systems, Inc., ticker symbol BRCD. Signs of an over-bought condition have become noticable. Also, there are breaking events concerning Apartment Investment and Management Co. and Mitsui & Company, Ltd.. From the News Archive: (9/3/2010 ) Bad news came from Hewlett Packard, News Corporation, Discovery Communications, Inc, and Electronic Data Systems. |