We document that the implied volatility skew of S&P 500 index puts is non-decreasing in the disaster index and risk-neutral variance, contrary to the implications of a broad class of no-arbitrage mode
Prior to the stock market crash of 1987, Black-Scholes implied volatilities of S&P 500 index options were relatively constant across moneyness. Since the crash, however, deep out-of-the-money S&P 500
Non-parametric inference for functional data over two-dimensional domains entails additional computational and statistical challenges, compared to the one-dimensional case. Separability of the covaria
Implied volatility is a critical metric in options trading. It gauges market expectations of price volatility. High implied volatility suggests anticipated price swings, while low implied volatility i
A collection of implied volatility indices of a dedicated national stock market index. All data is collected from investing . com and onvista . de (detailed Sources in PDF).