An Analysis of Volatility Spread via the Risk-Free Rate Proxy
40 Pages Posted: 25 Feb 2014 Last revised: 12 Mar 2015
Date Written: March 12, 2015
Abstract
The paper studies estimation of implied volatility and the impact of the choice of the corresponding risk-free rate proxy. We suggest to analyze the implied volatility and the risk-free rate proxy inferred in conjunction from the observed option prices. We formulate and solve an overdefined system of nonlinear equations for the Black-Scholes model using options data. More precisely, we seek an optimal approximate solution via differential evolution, a stochastic optimization technique. Some experiments with historical prices reveals higher inferred risk-free rate than commonly used proxies. This leads to narrower volatility spread, or the difference between implied and realized volatilities.
Keywords: implied volatility, optimization, risk-free rate
JEL Classification: C14, C51, C58, C61, G13
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