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Option Pricing and Distribution Characteristics

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Abstract

A number of flexible distributions (generalized beta of the second kind, inverse hyperbolic sine (IHS), \(g\)-and-\(h\), Weibull, Burr-3, Burr-12, generalized gamma, reciprocal gamma) are examined in the setting of option-pricing to explore potential improvements over the standard assumption of lognormal returns. Price formulas are presented specific to each assumed distributional form. The IHS option price formula has not previously been presented in the literature. An empirical application follows where implied risk-neutral density functions for each distribution are estimated from options on the S&P 500 Index. The distributions’ performance relative to one another is then evaluated with the more flexible distributions performing similarly and outperforming their special and limiting cases, including the Black-Scholes which is based on the lognormal.

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Notes

  1. Equity smiles did not appear until after the 1987 market crash, which created a permanent change in investors’ expectations regarding the potential for large, discontinuous movements in asset prices. See Bates (2000).

  2. Analytic expressions for the IHS, g-and-h, GB2, and generalized LN moment spaces can be found in Johnson (1949), Dutta and Perry (2007), McDonald and Turley (2011), and McDonald et al. (2013)

  3. The \(g\)-and-\(h\) moment space discussed in this paper is limited to \(h\ge 0\). Negative values for h yield pdf’s with bounded support which may be U-shaped but allow for additional combinations of skewness and kurtosis (see Dutta and Perry (2007), as well as McDonald and Turley (2011)).

  4. Computations involving the CDF of the GB2 and its special cases can be evaluated using programs for the incomplete beta and gamma functions.

  5. See McDonald and Bookstaber (1991).

  6. Milevsky and Posner (1998) use method of moments to estimate the parameters of a reciprocal gamma and price options. Our objective was to compare forecast performance for different distributions using a common estimation method, described in the next section.

  7. Options markets typically are thinly traded and have small open interest or number of contracts relative to the underlying asset markets.

  8. Constant Maturity Treasury rates (CMTs) were used, where the length of maturity was chosen to be closest to the time until the option’s expiration.

  9. A number of optimization algorithms in MATLAB were tested. The objective function (2.26) proved to be ill-behaved with resulting parameter estimates often reliant upon one’s starting location. In an attempt to overcome this difficulty, we perform a grid search, with the optimization algorithm being run starting at each point on the grid for each time period. Although computationally intensive, this method results in more reliable solutions to the minimization problem. The reported results come from the Nelder-Mead simplex algorithm, where the starting point was chosen using a grid search over feasible values for the free parameters.

  10. The \(g\)-distribution can also be reparameterized as a three-parameter generalized lognormal distribution. In light of these results, we considered allowing the \(h\) parameter in the \(g\)-and-\(h\) distribution to be negative. However, many of the corresponding fitted pdf’s were bounded and appeared U-shaped, often rather uniform in shape with vertical asymptotes at the bounds. There was some evidence of increased accuracy, but to compare pdf’s with common general shapes, we restricted our analysis in this paper to \(h\ge 0\).

  11. As a reminder, we define returns as \(S/S_T\). The concern of allowing negative returns is not solved by redefining returns as \(S/S_T-1\), which is similarly bounded below. The GB2 could be translated, but the IHS and \(g\)-and-\(h\) distributions’ domains allow for positive probability below \(-\)1.

  12. Exceptions include Dutta and Babel (2005), who examine the lognormal, Burr-12, Weibull, and \(g\)-and-\(h\) in one application, as well as Fabozzi et al. (2009), who examine the lognormal, Weibull, and generalized gamma.

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Acknowledgments

Financial assistance from BYU’s Office of Research and Creative Activities is gratefully acknowledged, as are helpful comments from Scott Condie, David Babbel, Joe Langsam, Kabir Dutta, Richard Michefelder, Keith Vorkink, and the referees.

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Correspondence to James B. McDonald.

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Mauler, D.J., McDonald, J.B. Option Pricing and Distribution Characteristics. Comput Econ 45, 579–595 (2015). https://doi.org/10.1007/s10614-014-9441-z

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