• Decline in temperature variability on Svalbard 

      Hølleland, Sondre; Karlsen, Hans (Journal article; Peer reviewed, 2020)
      The variability in the temperature on Svalbard, Norway, has been decreasing over the last four decades. This may be due to the reduction in sea ice, transitioning the regional climate to a more stable, coastal one.We ...
    • The Effect of Environmental Stressors on Tinnitus: A Prospective Longitudinal Study on the Impact of the COVID-19 Pandemic 

      Schlee, Winfried; Hølleland, Sondre; Bulla, Jan; Simoes, Jorge; Neff, Patrick; Schoisswohl, Stefan; Woelflick, Stella; Schecklmann, Martin; Schiller, Axel; Staudinger, Susanne; Probst, Thomas; Langguth, Berthold (Journal article; Peer reviewed, 2020-08)
      Tinnitus, the perception of sound in the absence of a corresponding sound, and the distress caused by it, is rarely a static phenomenon. It rather fluctuates over time depending on endogenous and exogenous factors. The ...
    • Spatio-Temporal Generalized Autoregressive Conditional Heteroskedasticity Models 

      Hølleland, Sondre (Master thesis, 2016-06-02)
      This thesis presents a spatio-temporal extension of the GARCH process with a specific spatial dependence structure. Different simulation and estimation techniques are developed. Assuming a circular spatial structure at ...
    • Volatility modelling in time and space 

      Hølleland, Sondre (Doctoral thesis, 2020-11-06)
      This thesis contributes to the scientific community in several aspects. We introduce both spatial- and spatio-temporal extensions to the family of GARCH and ARMA-GARCH models and present asymptotic statistics for the quasi ...