Apple Computer Historical Volatility
Volatility is defined as the price range for a period, divided by the average price for the period:|
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. This is a different concept from the weekly average of daily volatility.
The red plot shows the actual price. 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. Average Daily Volatility over the history of AAPL has been 4% in contrast to the Average Quarterly Volatility of 37%.
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 AAPL Volatility Curve, the increase is not constant. |
A frequency distribution of the green points on the first chart (the daily volatility) yields this histogram. |
Similarly, the purple points on the top chart, the Quarterly Volatility Values, are subjected to frequency distribution here. |
For Subscribers: Refined Analysis of Apple Computer Volatility and Risk Behavior
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