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Sökning: WFRF:(Gustafsson Oskar) > (2015-2019)

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1.
  • Gustafsson, Oskar, et al. (författare)
  • Variance stabilizing filters
  • 2019
  • Ingår i: Communications in Statistics - Theory and Methods. - : Informa UK Limited. - 0361-0926 .- 1532-415X. ; 48:24, s. 6155-6168
  • Tidskriftsartikel (refereegranskat)abstract
    • In this paper new filters for removing unspecified form of heteroscedasticity are proposed. The filters build on the assumption that the variance of a pre-whitened time series can be viewed as a latent stochastic process by its own. This makes the filters flexible and useful in many situations. A simulation study shows that removing heteroscedasticity before fitting a model leads to efficiency gains and bias reductions when estimating the parameters of ARMA models. A real data study shows that pre-filtering can increase the forecasting precision of quarterly US GDP growth.
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2.
  • Räftegård, Oskar, et al. (författare)
  • Energin under mark ska upp till ytan : Strategisk innovationsagenda för geoenergi
  • 2016
  • Rapport (övrigt vetenskapligt/konstnärligt)abstract
    • The Swedish Strategic Innovation Agenda for Geoenergy develops a strategy for highlighting the need for geoenergy research, development and innovation in relation to the business community and authorities. Sweden has a strong global position in the field. Geothermal energy is the third­largest renewable energy source in Sweden, along with wind power. Currently, approximately 18 TWh of renewable heat per year is supplied to household, industrial and commercial buildings. In addition, there is 1­2 TWh of cooling. There is a great need for a long­term strategy and financial plan for geoenergy research and innovation in Sweden, in order to maintain and further develop research groups and the country's leading position in the field. Today, Swedish research in this field comprises about 14 full­time positions at universities, institutes and companies. This is little compared to the existing use of geothermal energy, about 19 TWh, which is worth about 15 billion SEK in consumer sales. It is also little in relation to possible future contributions to sustainable development in Sweden and abroad. The agenda is divided into short independent chapters that are tailored to different target groups/ applications. Each chapter consists of an introduction to the current situation, how geoenergy can strategically contribute to a sustainable society, and what actions/needs are a priority.
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