"A paper recently published in the journal Tobacco Control purports to show that the implementation of a smoking prohibition in Delaware had no statistically significant effect on the revenues of three gaming facilities in that state. After undertaking a thorough analysis of the data, I find...

"One key stylized fact in the empirical option pricing literature is the existence of an implied volatility surface (IVS). The usual approach consists of fitting a linear model linking the implied volatility to the time to maturity and the moneyness, for each cross section of options data....