Recent results on so-called SEMIFAR models introduced by Beran (1997) are discussed. The nonparametric deterministic trend is estimated by a kernel method. The differencing and fractional differencing parameters as well as the autoregressive coefficients are estimated by an approximate maximum...

Das vorliegende Diskussionspapier untersucht methodische Änderungen der Saisonbereinigung, die mit dem Übergang von Census X-ll zu X-12-ARIMA verbunden sind, und ihre Konsequenzen für die Analyse der aktuellen Wirtschaftsentwicklung, wie sie in der Deutschen Bundesbank vorgenommen wird. Die...

Time series in many areas of application often display local or global trends. Typical models that provide statistical explanations of such trends are, for example, polynomial regression, smooth bounded trends that are estimated nonparametrically, and difference-stationary processes such as, for...

The distinction between stationarity, difference stationarity, deterministic trends as well as between short- and long-range dependence has a major impact on statistical conclusions, such as confidence intervals for population quantities or point and interval forecasts. In this paper, recent...

SEMIFAR models introduced in Beran (1999) provide a semiparametric modelling framework that enables the data analyst to separate deterministic and stochastic trends as well as short- and long-memory components in an observed time series. A correct distinction between these components, and in...

Gemäß der Preisstatistik der Europäischen Kommission waren die Kraftstoffpreise in Österreich durchwegs höher als in den Nachbarländern. Die Preisdifferenz kann Standorts- aber auch wettbewerbsbedingt sein. Die Wettbewerbsintensität beeinflußt nicht nur das Preisniveau, sondern auch die...