Exponential smoothing (ES) with ARCH (autoregressive conditionally heteroscedastic) and GARCH (generalized ARCH) errors are introduced. This is done for a large class of ES methods, those for which the forecasts are obtained using a set of additive updating formulas, and also those for which an...

The paper presents an algorithm for computing the asymptotic Fisher information matrix of a possibly seasonal single-input single-output (SISO) time-series model. That matrix is a block matrix whose elements are basically integrals of rational functions over the oriented unit circle. The...

The Belgian nuclear phase-out law imposes closing down in the 2015-2025 period seven nuclear power plants (NPPs) producing more than 50% of the domestic electricity. This creates an urgent problem in the country because of the absence of well-defined capacity-replacement plans. Though a...

Using an original survey sample of 103 unquoted Belgian technology-based small firms (TBSFs), we examine the capital structure of start-up companies during their consecutive development stages. We find that internal funds, either alone as personal savings or in combination with family and...

Recognizing the urgent need for sustainability, we argue that to move beyond the rhetoric and to actually realize sustainable development, it must be considered as a decision-making strategy. We demonstrate that sustainability assessment and sustainability indicators can be powerful...

A partir de du dépouillement de près de 1000 documents conservés aux Archives d'Etat de la Province de Novare, des Archives de l'Association d'irrigation Est-Sesia, des Archives de la société de chemins de fer italienne (Trenitalia), l'auteur propose une reconstruction des phases...