• 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 ...