• Analyzing risk of stock collapse in a fishery under stochastic profit maximization 

      Poudel, Diwakar; Sandal, Leif Kristoffer; Kvamsdal, Sturla Furunes (Discussion paper;2012:4, Working paper, 2012-04)
      In commercial fisheries, stock collapse is an intrinsic problem caused by overexploitation or due to pure stochasticity. To analyze the risk of stock collapse, we apply a relatively simple Monte Carlo approach which can ...
    • A stitch in time saves nine : the costs of postponing action in climate policy 

      Steinshamn, Stein Ivar; Kvamsdal, Sturla Furunes; Sandal, Leif Kristoffer (Report;2011:16, Research report, 2011)
      The main purpose of this report is to investigate the effects of postponing implementation of a carbon tax assuming that externalities associated with climate change and global warming is real. Failing to internalize these ...
    • Do species interactions and stochasticity matter to optimal management of multispecies fisheries? 

      Poudel, Diwakar; Sandal, Leif Kristoffer; Steinshamn, Stein Ivar; Kvamsdal, Sturla Furunes (Discussion paper;2012:1, Working paper, 2012-01)
      The multispecies fisheries management looks at a bigger picture in addressing the long-term consequences of present decisions. This implies an ecosystem management that includes a number of species and their physical, ...
    • Fisheries management under irreversible investment : does stochasticity matter? 

      Poudel, Diwakar; Sandal, Leif Kristoffer; Kvamsdal, Sturla Furunes; Steinshamn, Stein Ivar (Discussion paper;2011:20, Working paper, 2011-11)
      We present a continuous, nonlinear, stochastic and dynamic model for capital investment in the exploitation of a renewable resource. Both the resource stock and capital stock are treated as state variables. The resource ...
    • Indexing of technical change in aggregated data 

      Kvamsdal, Sturla Furunes (Working paper;2015:6, Working paper, 2015-07)
      The Baltagi-Griffin general index of technical change for panel data has earlier been applied to aggregated data via the use of period dummy variables. Period dummies force modeling into estimation of the latent level of ...
    • Long-term sustainable and optimal management of multispecies stochastic fisheries 

      Poudel, Diwakar; Sandal, Leif Kristoffer; Steinshamn, Stein Ivar; Kvamsdal, Sturla Furunes (Working papers;01/14, Working paper, 2014-02)
      Multispecies fisheries management is the first step towards ecosystem-based fisheries management. Multispecies management accounts for a number of species and their physical, biological, and economic interactions. These ...
    • A market-based approach to manage endangered species interactions 

      Kvamsdal, Sturla Furunes; Stohs, Stephen M. (Discussion paper, Working paper, 2010-09)
      An economic activity interacts with an endangered species. The activity can be divided into mutually exclusive strata with different levels of inter- action. Observing the activity in order to monitor interactions is ...
    • A market-based approach to manage endangered species interactions 

      Kvamsdal, Sturla Furunes; Stohs, Stephen M. (Working paper, Working paper, 2010-09)
      An economic activity interacts with an endangered species. The activity can be divided into mutually exclusive strata with different levels of interaction. Observing the activity in order to monitor interactions is costly. ...
    • Modeling the Norwegian sea ‘pelagic complex’. An application of the ensemble kalman filter 

      Ekerhovd, Nils-Arne; Kvamsdal, Sturla Furunes (Working paper;07/13, Working paper, 2013-02)
      We have estimated the parameters of a modified logistic ecosystem model of the pelagic fish stocks in the Norwegian Sea with the Ensemble Kalman Filter. Our model only contains four parameters. The model appear to capture ...
    • Optimal maintenance scheduling of local public purpose buildings 

      Hopland, Arnt O.; Kvamsdal, Sturla Furunes (Discussion paper;36/14, Working paper, 2014-11)
      We formulate the maintenance scheduling decision as a dynamic optimization problem, subject to an accelerating decay. This approach offers a formal, yet intuitive, weighting of the trade-offs involved when deciding a ...
    • An overview of empirical analysis of behavior of fishermen facing new regulation 

      Kvamsdal, Sturla Furunes (Discussion paper, Working paper, 2010-08)
    • The premium of marine protected areas : a simple valuation model 

      Kvamsdal, Sturla Furunes; Sandal, Leif Kristoffer (Discussion paper, Working paper, 2007-03)
      Marine Protected Areas are considered as a hedging tool against some of the uncertainties that trouble many fisheries today. Such tools are always connected with a cost; a premium. An optimal harvest rule is combined ...
    • The premium of marine protected areas : a simple valuation model 

      Kvamsdal, Sturla Furunes; Sandal, Leif Kristoffer (Working paper, Working paper, 2007-03)
      Marine Protected Areas are considered as a hedging tool against some of the uncertainties that trouble many fisheries today. Such tools are always connected with a cost; a premium. An optimal harvest rule is combined with ...
    • Spatial management of a fishery under parameter uncertainty 

      Kvamsdal, Sturla Furunes; Groves, Theodore (Discussion paper, Working paper, 2008-06)
      Spatial management of a fishery under parameter uncertainty is analyzed. The habitat is divided into two areas, and the effort level in the two areas may be different. The migration of biomass between the areas follows a ...
    • Spatial management of a fishery under parameter uncertainty 

      Kvamsdal, Sturla Furunes; Groves, Theodore (Working paper, Working paper, 2008-07)
      Spatial management of a fishery under parameter uncertainty is analyzed. The habitat is divided into two areas, and the effort level in the two areas may be different. The migration of biomass between the areas follows a ...
    • Technological change in renewable resource industries: an alternative 

      Kvamsdal, Sturla Furunes (Discussion paper;2012:14, Working paper, 2012-12)
      I set forth a generalized stochastic time trend approach, based upon the Kalman filter, as an alternative to the general index approach to measure technological change. Technology is treated as a latent variable in a ...
    • The ensemble kalman filter for multidimensional bioeconomic models 

      Kvamsdal, Sturla Furunes; Sandal, Leif Kristoffer (Working papers;04/14, Working paper, 2014-03)
      To serve the needs for integrating economic considerations into management decisions in ecosystem frameworks, we need to build models that capture observed system dynamics and incorporate existing knowledge of ecosystems ...
    • The ensemble Kalman filter in bioeconomics 

      Kvamsdal, Sturla Furunes; Sandal, Leif Kristoffer (Discussion paper;2012:5, Working paper, 2012-05)
      We demonstrate the power of the Ensemble Kalman Filter in specifying ecosystem models ideal for bioeconomic analysis. Bioeconomic analysis requires models to be relatively simple, but models must still capture the nature ...
    • Up the Ante on Bioeconomic Submodels of Marine Foodwebs : a data assimilation-based approach 

      Ekerhovd, Nils-Arne; Kvamsdal, Sturla Furunes (Working paper;13/14, Working paper, 2014-09)
      While economists have discussed ecosystem-based management and similar concepts, little attention has been devoted to the art of modeling. Models of ecosystems or foodwebs that make economic analysis viable should capture ...