Die empirische Kapitalmarktforschung beobachtet in den Volatilitäten von Aktienkursrenditen immer wieder eine lang anhaltende Abhängigkeitsstruktur, ein so genanntes langes Gedächtnis. Dieses hat weit reichende Konsequenzen. Beispielsweise verkompliziert ein tatsächlich vorliegendes langes...

Financial markets (share markets, foreign exchange markets and others) are all characterized by a number of universal power laws. The most prominent example is the ubiquitous finding of a robust, approximately cubic power law characterizing the distribution of large returns. A similarly robust...

The use of GARCH models is widely used as an effective method for capturing the volatility clustering inherent in financial returns series. The residuals from such models are however often non-Gaussian, and two methods suggest themselves for dealing with this; outlier removal, or use of...