This paper develops a dynamic portfolio selection model incorporating economic uncertainty for business cycles. It is assumed that the financial market at each point in time is defined by a hidden Markov model, which is characterized by the overall equity market returns and volatility. The risk...

In foreign trade statistics, the Federal Statistical Office compiles data on Germany's trade in goods with other countries from the export and import declarations submitted by businesses that are required to report data. Complex edit checks are employed to detect and correct erroneous data to...

We consider the problem of choosing two bandwidths simultaneously for estimating the difference of two functions at given points. When the asymptotic approximation of the mean squared error (AMSE) criterion is used, we show that minimisation problem is not well-defined when the sign of the...

Für Deutschland und andere entwickelte Länder werden Methoden zur Schätzung von sozioökonomischen Indikatoren auf räumlich disaggregierter Ebene benötigt, ohne dabei Populations-Mikrodaten zu verwenden, die meist nicht öffentlich verfügbar sind. Viele sozioökonomische Indikatoren, zum...

We examine the causes for rising income inequality in Europe's most populous economy. From 2000 to 2006, Germany experienced an unprecedented rise in net equivalized income inequality and poverty. At the same time, unemployment rose to record levels and there was evidence for a widening...

We propose a new semiparametric observation-driven volatility model where the form of the error density directly influences the volatility dynamics. This feature distinguishes our model from standard semiparametric GARCH models. The link between the estimated error density and the volatility...

This paper introduces a multivariate kernel based forecasting tool for the prediction of variance-covariance matrices of stock returns. The method introduced allows for the incorporation of macroeconomic variables into the forecasting process of the matrix without resorting to a decomposition of...

In the last decade, after accession to European Union, Poland has achieved a significant improvement of indicators relating to income on a national level. Polish GDP per capita (in PPP terms) increased from 49% of European Union average in 2004 to 67% in 2013 showing progress in each year...

Für Daten mit geografischem Bezug eignen sich Kartendarstellungen zur Visualisierung, um einen einfachen Zugang zu komplexen Informationen zu erhalten. Insbesondere die Verteilung verschiedener Bevölkerungsgruppen und die Identifikation von Hotspots stellen ein für Planungszwecke bedeutendes...