The problem of portfolio selection is a standard problem in financial engineering and has received a lot of attention in recent decades. Classical mean-variance portfolio selection aims at simultaneously maximizing the expected return of the portfolio and minimizing portfolio variance. In the...

This work derives explicit kernel approximations for universal kriging predictors for a class of intrinsic random function models. This class of predictors is of particular interest because they are equivalent to the standard two-dimensional thin plate smoothing splines. By introducing a...

Analyzing accidents clearly is an important method for maintaining and improving safety in aviation. Nevertheless, evaluating these accident reports is equally important. Still, such evaluations seem to be generally neglected, especially in the military domain. The aim of the current study was...

Bid–ask spreads using intraday data reveal significant sensitivity to European Central Bank (ECB) macro-announcements. Effects are strongest for announcements that comprise unexpected information or a change in interest rates, and spreads rise sharply during the minutes surrounding interest...

Purpose – Since 2008, the German open-ended real estate fund (GOEREF) industry has experienced a critical phase of suspensions of redemption of fund shares, announced fund terminations and, eventually, introduction of a new regulation. With assets under the management of over 80 billion,...