Volatility Analysis for Apple Computer
This chart shows Volatility for Apple Computer, defined to be the price range as a portion of the average price:|
For instance, on 2/15/2011 the average price was 358.76 with a range of 2.42, indicating a Daily Volatility of 0.6%. 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. 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. 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 AAPL has been 4% in contrast to the Average Quarterly Volatility of 37%.
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. As the timespan across which Volatility is measured increases, the Volatility is expected to increase. However, as seen in this plot of the AAPL Volatility Curve, the increase is not constant. |
This histogram is a frequency distribution of Daily Volatility, corresponding to the green points on the first chart on this page. |
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. |
For Subscribers: Refined Analysis of Apple Computer Volatility and Risk Behavior
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