We study the problem of estimating the coefficients of a diffusion (Xl, t 2:: 0); the estimation is based on discrete data Xn . . n = 0, 1, ... ,N. The sampling frequency delta t is constant , and asymptotics arc taken at the number of observations tends to infinity. We prove that the problem of...

Price variations observed at speculative markets exhibit positive autocorrelation and cross correlation among a set of assets, stock market indices, exchange rates etc. A particular problem in investigating multivariate volatility processes arises from the high dimensionality implied by a...

Search for an unknown set A,Card(A) = s, of significant variables of a linear model with random IID discrete binary carriers and finitely supported IID noise is studied. Two statistics T1, Ts, based on maximization of Shannon Information (SI) of the corresponding classes of joint empirical...

Wir untersuchen Übernahmen deutscher Unternehmen zwischen 1985 und 1993 im Hinblick auf ihren Einfluß auf den Marktwert des Käufers. In Erweiterung bisheriger Studien analysieren wir insbesondere, welche Ereignisse den größten Informationsgehalt haben und damit zu den deutlichsten...