David Fox (Ph.D. Economics, Columbia, Visiting Assistant Professor at Kester College, Knittersville, New York) is having a stressful year. He has a temporary position at a small college in a small town miles from everything except Albany. His students have never read Freakonomics. He thinks he...

Statistical dynamics of financial systems is investigated, based on a model of a randomly coupled equation system driven by a stochastic Langevin force. It is found that in a stable regime the noise power spectrum of the system is 1/f-like: ∝ ω- 3/2 (where ω is the frequency), that the...

Motivated by an application in a public utility, the credit screening problem is re-examined from a decision theoretic viewpoint. The relationships between several alternative problem formulations are explored, and compared to the classical linear discriminant analysis (LDA) approach. Several...

David Fox (Ph.D. Economics, Columbia, Visiting Assistant Professor at Kester College, Knittersville, New York) is having a stressful year. He has a temporary position at a small college in a small town miles from everything except Albany. His students have never read Freakonomics. He thinks he...

This note explores the mathematical theory to solve modern gambler’s ruin problems. We establish a ruin framework and solve for the probability of bankruptcy. We also show how this relates to the expected time to bankruptcy and review the risk neutral probabilities associated an adjustment to...

High-frequency trading is an algorithm-based computerized trading practice that allows firms to trade stocks in milliseconds. Over the last fifteen years, the use of statistical and econometric methods for analyzing high-frequency financial data has grown exponentially. This growth has been...