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Having more to say, please consider to be our guest blogger. Implied Binomial Tree Posted by abiao at The trackback url will expire after Black Scholes model assumes stock price follows GBM with constant volatility, however, the market implied volatilities of stock options often show "the volatility smile", which decreases with the strike level, and increases with the time to maturity.

There are various proposed extensions of this GBM model to account for "the volatility smile". One approach is the implied binomial tree technique proposed by Rubinstein , in which the author assumes the stock prices are generated by a modified random walk where the underlying assets volatility depends on both stock price and time, therefore it is an modification of basic Binomial tree method.

Implied binomial tree uses the observable market option prices in order to estimate the implied distribution, to construct such a tree, optimization routine generally applies and technically it is more difficult than a basic Binomial tree.

Here is a good paper implementing the implied binomial tree using an Excel spreadsheet without VBA. It demonstrates both the optimization needed to generate implied ending risk-neutral probabilities from a set of actual option prices and the backwards recursion needed to solve for the entire implied tree.

Download the paper and accompanying excel file at http: Excel for Volatility Calculation Posted by abiao at One thing you should be aware is some of the files involve a call to NAG library , one of the major benefits of the NAG Library is its inherent flexibility, it can be used by programmers developing in traditional languages, or by users of modern software packages and programming environments, like Microsoft Excel.

VBA Finance Posted by abiao at Visual Basic in finance application has been introduced many times in this blog, one especially useful book was reviewed in an old post Option Pricing Models and Volatility Using Excel-VBA.

Corporate Training Courses | Wall Street Training

Here is another VBA finance site perhaps of your interest. As the site describes: The purpose of this site is to provide financial professionals with VBA code snippets and complete projects that can be useful in their work and development.

Finance Add-in for Excel | Hoadley

Our portfolio includes examples of: Download Multiple Stock Quotes From Yahoo Finance Posted by abiao at AAN left comments yesterday at the post Download historical stock price saying the methods I shared are either only for a single stock historical prices, such as Yahoo chinese historical stock data , or for multiple stocks quotes of the latest trading day, like Excellent Yahoo Finance Data Downloader , however, what he and many others I guess wants is an Excel to download multiple stocks historical quotes from Yahoo finance, fair enough.

Although I don't recommend to do this in Excel as it becomes messy with more and more stocks added, I attach a sample excel with Macro for multiple stocks quotes downloading. Option Pricing Models and Volatility Using Excel-VBA Posted by abiao at Option Pricing Models and Volatility Using Excel-VBA is the best book I have read this year, recommended by a friend of mine couple of days ago.

Monte Carlo Option Pricing with Excel

I didn't look positive at it at the beginning as there are dozes of books on similar topics and to be honest, I never heard of the author now I know he works in industry. The book starts with complex number, how to write macro code for it; followed by selected root-finding algorithms, and weighted least square regression; then introduces numerical integration, tree-building, black scholes, Heston model, GARCH, implied volatility, parameter estimation, etc.

Black Scholes Model: Calculator, Formula, VBA Code and More

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