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The Importance of Volatility in Options and Futures PricingComputing option prices? You need to estimate volatility somehow! Volatility is well known to be very difficult to estimate accurately and is often regarded as the most critical element in options pricing and analysis.Volatility/X and Volatility/NET provide a range of the best available methods for computing both implied volatility and statistical or historical volatility. The analysis of options and futures using computerbased methods requires a number of inputs. Arguably, the most important, yet usually the most difficult input to obtain, is the volatility. The volatility of a stock price is usually defined as the standard deviation of the daily price returns of a stock over a set period of time. Often this estimate is annualized, that is, converted to a one year value of volatility by multiplying by a conversion factor.Small Errors in Volatility Can Give Big Errors in Option PricesObtaining accurate estimates for volatility which will provide the most beneficial inputs to the option pricing models used is critical. It has been shown that, based on the BlackScholes model, a 10% underestimation of the returns variance can lead to a 14.5% underpricing of a 3 month, 15% out of the money option and using the same model, the delta would be estimated as being 8.2% lower than the value found using the correct volatility input [7]. Consider the following examples for a European option calculated using the BlackScholes model:
So what can you do to try and overcome these problems?
Volatility/X implements a number of the best known and well established, highly efficient methods for computing both historical and implied volatility. Algorithms for Computing Historical and Implied VolatilityThere are a few main approaches to computing volatility. These include: a) historical volatility and b) implied volatility. The historical volatility is obtained by using a series of historical prices to estimate the standard deviation over a period of time. The implied volatility is effectively the current estimate of the volatility implied by the market. It is obtained by inverting the current option price estimate. That is, given the inputs for pricing an option and using the current option price, it is possible to invert the model to estimate the volatility.Volatility/X provides a range of highly efficient methods for computing both historical and implied volatility. We will describe some of these below: Garman and Klass define a measure of the efficiency of an estimator as: Eff = Var(var_o)/Var(y). The aim is to obtain a method of estimating the volatility which reduces the variance of the estimate for a given amount of data. Or put another way, to achieve the same accuracy, a smaller amount of data is required when using the more efficient algorithms. In contrast to the classical historical volatility estimators, a number of improved methods of computing historical volatility have been proposed which have significantly improved efficiency. These include the Parkinson algorithm which has an efficiency of approximately 5.2 and the GarmanKlass algorithm which has an efficiency of 7.4 or better. While these methods can provide better results than the classical historical volatility estimator, it is also evident that this is a continuing area of research and the performance of the various methods is still being investigated [8]. Please note: these algorithms make
a number of assumptions and users must make themselves fully aware of how
and when to use these models. Please see the disclaimer and risk statement below
and the full terms and conditions of the software license for more details. Historical Volatility
Implied Volatility
With just a few lines of code, it is now possible to load market data and output estimates of the theoretical stock volatilities. The data sources can be any data source that can be accessed from your application and supplied to the functions. Volatility/X Excel AddIn, ActiveX and COM ComponentVolatility/X is a software component that can be used in wide range of Windows applications as well as an Excel AddIn. It requires no user interface and can be accessed in the Microsoft Visual Studio development environment, including Visual Basic 6, Visual C++ 6, and Visual Studio .NET 20022005. Volatility/X supports threaded blocking and nonblocking modes. This means for lengthy computations, you can use the control in a program, pass it some data for processing and the program can then run other tasks and respond to user input while the computations are taking place. When processing is complete, an event is fired and the program continues from the data processing step. This blocking/nonblocking mode is under program control. Error codes are returned from the event indicating the success or otherwise of the data processing. The computations can also be interrupted under program control by the user, for example, it is straight forward to implement a "Stop" button to direct the computations to be stopped. The Volatility/X Component can be used in Excel spreadsheets or in your own applications created in Visual Basic 6, VC++ or other languages. We provide full source code demos and backup support to help you.
Volatility/X is written in Visual C++ 6.0 and is designed for maximum speed and reliability. It can be used in a wide range of applications and importantly, has a full Excel interface so that it can be used directly from within Excel. It has Menu access to Help and utilized Excel's Insert Function capabilities. Volatility/X makes an ideal companion software component for Options/X. For more information on Volatility/X or if you have any questions, please contact us today.
Easily access Volatility/X methods via the Insert Function method in Excel.
The parameters can be inserted via the Excel Function Arguments dialog box.
Excel demo supplied with Volatility/X
It is well known that the volatility estimate for options pricing is very important and Volatility/X is a positive step towards obtaining the best values possible. Volatility/X is a tool for professionals. You need to understand the limitations of the software and use it wisely, but with careful attention to the input data ranges and the results that it gives, ie by using multiple volatilities to ensure only valid estimates are used, Volatility/X is an excellent choice in obtaining improved volatility inputs to your models. References


