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...

We introduce a new fractionally integrated model for covariance matrix dynamics based on the long-memory behavior of daily realized covariance matrix kernels and daily return observations. We account for fat tails in both types of data by appropriate distributional assumptions. The covariance...

In this study, the performance of the Multifractal Model of Asset Returns (MMAR) was examined for stock index returns of four emerging markets. The MMAR, which takes into account stylized facts of financial time series, such as long memory, fat tails and trading time, was developed as an...