Stock returns appear to comove in excess of common news about stock fundamentals. I examine comovement when stocks are added to or deleted from the FTSE 100 stock index, which are events without news about fundamantals. Using a natural experiment created by FTSE's index balancing rule, I find...

The study of the stock market in a country and the understanding of the influence of stock market crashes within and across the markets has been the subject matter of many researches, academicians and analysts during recent times. In this study we investigate the mean-volatility spillover...

This paper tests the weak-form efficient market hypothesis for Korean industry-sorted portfolios. Based on a panel variance ratio approach, we find significant mean reversion of stock returns over long horizons in the pre Asian currency crisis period but little evidence in the post-crisis...

We propose a new and flexible non-parametric framework for estimating the jump tails of Itô semimartingale processes. The approach is based on a relatively simple-to-implement set of estimating equations associated with the compensator for the jump measure, or its "intensity", that only...

We propose a new and flexible non-parametric framework for estimating the jump tails of Itô semimartingale processes. The approach is based on a relatively simple-to-implement set of estimating equations associated with the compensator for the jump measure, or its "intensity", that only...

Comparisons are made of the CBOE skew index with those derived from parametric skews of bilateral gamma models and from the differentiation of option implied characteristic exponents. Discrepancies may be attributed to strike discretization in evaluating prices of powered returns. The remedy...

We propose a novel factor model for option returns. Option exposures are estimated nonparametrically and factor risk premia can vary nonlinearly with states. The model is estimated using regressions, with minimal assumptions on factor and option return dynamics. Using index options, we...

Because implied volatility is essential for pricing options, analyzing derivative strategies and measuring risk in investment portfolios containing derivatives, understanding variations in implied volatility also becomes vital. Aside from a secular trend, volatility clustering and calendar...

This paper proposes a tail risk index, TIX, as the growth rate of the model-free cumulant generating function of market risk calculated from index option prices. It captures the power law decay rate of the left tail of future return distributions, and thus reflects market beliefs about the...

Robust weak form efficiency tests are conducted to examine market efficiency in two pan-European indices; the large capitalisation EuroStoxx 50 and the small capitalisation EuroStoxx Small from January 2000 to March 2012. Applying the non-parametric Belaire-Franch and Opong (2005) multiple...