Milk production and procurement in Poland and UE-15 show a clear seasonal fluctuations which are determined by the distribution of calving and feeding regimes. The seasonal fluctuations are transferred on the consequent stages of the food chain and also have got numerous microeconomic...

The seasonal dependency or seasonality is a general component of the time series pattern that can be examined via correlograms, where the correlogram displays graphical and numerical information in an autocorrelation function. This paper discusses the use of an autocorrelation function in the...

Time series analysis used to investigate the stratospheric ozone formation and decomposition processes. Different time series methods are applied to detect the reason for extreme high ozone concentrations for each season. Data was convert into seasonal component and frequency domain, the latter...

In this paper we study simple time series models and assess their forecasting performance. In particular we calibrate ARMA and ARMAX (where the exogenous variable is the system load) processes. Models are tested on a time series of California power market system prices and loads from the period...

In this paper we study two statistical approaches to load forecasting. Both of them model electricity load as a sum of two components – a deterministic (representing seasonalities) and a stochastic (representing noise). They differ in the choice of the seasonality reduction method. Model A...

Die Saisonbereinigung ist ein elementarer Bestandteil bei der Berechnung der Ergebnisreihen des ifo Konjunkturtests. Ab Januar 2015 erfolgt hier eine Umstellung der Methode vom ASA-II-Verfahren auf das international weit verbreitete X-13ARIMA-SEATS-Verfahren. Der Artikel zeigt das grundlegende...

Der vorliegende Beitrag untersucht, welchen Einfluss die Umstellung des Saisonbereinigungsverfahrens von dem ASA-II-Verfahren auf die X-13ARIMA-SEATS-Methode auf die Prognosekraft der ifo Indikatoren hat.

O'Hara G. (2005) A journey without maps: the regional policies of the 1964-70 British Labour Government, Regional Studies 39 , 1183-1195. This paper examines four influences on British regional policy in the late 1960s: party politics in the context of the economic environment; the structure of...