This study investigates empirically the presence of nonlinearities in the Athens Composite Share Price Index high-frequency returns. A preliminary analysis indicates that volatility exhibits a periodic intraday inverse J-shaped pattern, associated with the opening and closing of the market....

This paper considers the task of forming a portfolio of assets that outperforms a benchmark index, while imposing a constraint on the tracking error volatility. We examine three alternative formulations of active portfolio management. The first one is a typical setup in which the fund manager...

We present a framework for designing optimal allocation strategies for large stock portfolios using dynamic factor models and multivariate volatility parametrisations. We attempt to elaborate on the fundamental structure of the Fama and French (FF) factor model with a special focus on the time...

An integral part of econometric practice is to test the adequacy of model specifications. If a model is adequately specified, it should not leave interesting features of the data-generating process in the errors. Despite the common tradition, the importance of diagnostic checking as a safeguard...

People facing choices under uncertainty, and gamblers in particular, are often subject to statistical fallacies. This paper explores the hypothesis that if lotto players were subject to the 'gambler's fallacy', predictable fluctuations in the number of jackpots would occur. Evidence, based on a...

Initial public offerings in every stock market are offered on the average at a discount. Underpricing is, however, more pronounced in emerging markets where the regulatory environment is more restrictive. In this paper we provide data on Greek IPOs and demonstrate that the extreme underpricing...

Under the assumption of random number selection, higher moments of a lotto ticket payoff seem to exhibit a peculiar behaviour; variance (and probably skewness) rises up to some number of bets before approaching its limit from above. A close inspection of the 'simplest' expression obtained by...