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• W2888752010 abstract "Previous estimation results of risk-neutral densities explain in rather general terms that the tails of the resulting distribution “look fat,” and a way has to be found to model the tails of the estimated distribution. The author uses deep out-of-the-money S&P 500 index options to examine model mispricing of the tails of daily estimated risk-neutral densities. Out-of-sample tests show that model mispricing increases as one moves farther into the tails of the distribution. Across most moneyness groups, model mispricing increases as the option reaches maturity. The author compares two curve-fitting methods that have been proposed in the literature to estimate risk-neutral densities. The first method interpolates with a fourth-order spline and attaches tails from the general extreme value distribution (Figlewski 2010). The second method extends the available implied volatility space by balancing smoothness and fit of the estimated risk-neutral density (Jackwerth 2004). Fitting a fourth-order spline produces a closer fit to the observed implied volatilities. Examining the ability to replicate the implied volatility with the complete estimated option-implied risk-neutral density by looking at mean root-mean-square error, the method by Jackwerth (2004) resulted in lower in- and out-of-sample model mispricing, except for the deepest out-of-the-money put options. <b>TOPICS:</b>Tail risks, options <b>Key Findings</b> • This article compares two methods from the curve-fitting literature to estimate option-implied risk-neutral densities and looks at the accuracy to recover implied volatilities. • Model mispricing, measured by the root-mean-square error, increases for deeper out-of-the-money options. • Model mispricing increases as the option reaches its maturity across most out-of-sample moneyness groups." @default.
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• W2888752010 date "2018-08-24" @default.
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• W2888752010 title "Subclavian steal syndrome due to dialysis fistula corrected with subclavian artery stenting" @default.
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• W2888752010 doi "https://doi.org/10.1212/cpj.0000000000000510" @default.
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