Blar i NHH Brage på forfatter "Sandal, Leif Kristoffer"
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Economic evaluation of the fisheries policies in Denmark, Iceland and Norway : some performance indicators
Arnason, Ragnar; Sandal, Leif Kristoffer; Steinshamn, Stein Ivar; Vestergaard, Niels (Working Paper, Working paper; Working paper, 2002-08)The economic efficiency of the Danish, Icelandic and Norwegian cod fisheries is examined. For this purpose nonlinear aggregate models of these three fisheries are constructed. A particular mathematical approach to calculate ... -
Estimating the parameters of stochastic differential equations using a criterion function based on the Kolmogorov-Smirnov statistic
McDonald, A. David; Sandal, Leif Kristoffer (Discussion paper, Working paper, 1998)Estimation of parameters in the drift and diffusion terms of stochastic differential equations involves simulation and generally requires substantial data sets. We examine a method that can be applied when available time ... -
Estimation of biological and economic parameters of a bioeconomic fisheries model using dynamical data assimilation
Ussif, Al-Amin M.; Sandal, Leif Kristoffer; Steinshamn, Stein Ivar (Discussion paper, Working paper, 2000-05)A new approach of model parameter estimation is used with simulated measurements to recover both biological and economic input parameters of a natural resource model. The procedure efficiently combines time series of ... -
Estimation of biological and economic parameters of a bioeconomic fisheries model using dynamical data assimilation
Ussif, Al-Amin M.; Sandal, Leif Kristoffer; Steinshamn, Stein Ivar (Working Paper, Working paper; Working paper, 2002-03)A new approach of model parameter estimation is used with simulated measurements to recover both biological and economic input parameters of a natural resource model. The data assimilation technique is the variational ... -
Financial Investment Analysis of Residential Rooftop Solar PV Systems in Norway : A Model-Based Approach to Analyse Profitability and the Effect of Key Variables Under Current Market Conditions
Nybø, Gustav Kvalsund; Nyborg, Tobias (Master thesis, 2022)In light of increased electricity prices and high demand for renewable energy, solar PV deployment has risen rapidly and is expected to increase further, both globally and in Norway. Although a large part of the growth ... -
Fish wars on the high seas : a straddling stock competition model
McKelvey, Robert W.; Sandal, Leif Kristoffer; Steinshamn, Stein Ivar (Discussion paper, Working paper, 2001-04)The post World War II era saw the development of powerful self-contained fishing fleets, so-called distant-water fleets (DWFs), which roamed the worlds oceans, seeking out rich harvesting targets wherever they might be ... -
Fish wars on the high seas : a straddling stock competition model
McKelvey, Robert W.; Sandal, Leif Kristoffer; Steinshamn, Stein Ivar (Working Paper, Working paper; Working paper, 2001-04)The post World War II era saw the development of powerful self-contained fishing fleets, so-called distant-water fleets (DWFs), which roamed the world’s oceans, seeking out rich harvesting targets wherever they might be ... -
Fish wars on the high seas : erecting economic barriers to entry
McKelvey, Robert W.; Sandal, Leif Kristoffer; Steinshamn, Stein Ivar (Working paper, Working paper; Working paper, 2000-10)The 1993 U.N. Straddling Stock Agreement prescribes a multi-national organizational structure for management of an exploited marine fish stock, one whose range straddles both “Extended Economic Zones” (EEZs) and high seas ... -
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 ... -
Harvest control rules in modern fisheries management
Kvamsdal, Sturla F; Eide, Arne; Ekerhovd, Nils-Arne; Enberg, Katja; Gudmundsdottir, Asta; Hoel, Alf Håkon; Mills, Katherine E.; Mueter, Franz J.; Ravn-Jonsen, Lars; Sandal, Leif Kristoffer; Stiansen, Jan Erik; Vestergaard, Niels (Journal article; Peer reviewed, 2016)Harvest control rules have become an important tool in modern fisheries management, and are increasingly adopted to provide continuity in management practices, to deal with uncertainty and ecosystem considerations, and to ... -
Harvesting in a Fishery with Stochastic Growth and a Mean-Reverting Price
Kvamsdal, Sturla F; Poudel, Diwakar; Sandal, Leif Kristoffer (Journal article; Peer reviewed, 2014)We analyze a continuous, nonlinear bioeconomic model to demonstrate how stochasticity in the growth of fish stocks affects the optimal exploitation policy when prices are stochastic, mean-reverting and possibly harvest ... -
A hit-and-run interloper model for a regional fisheries management on the high sea
Sandal, Leif Kristoffer; Steinshamn, Stein Ivar; McKelvey, Robert W. (Discussion paper, Working paper, 2002-07)The 1993 U.N. Straddling Stock Agreement prescribes a multi-national organizational structure for management of an exploited marine fish stock, one whose range straddles both .Extended Economic Zones. (EEZs) and high seas ... -
Implications of a nested stochastic/deterministic bio-economic model for a pelagic fishery
McDonald, A. David; Sandal, Leif Kristoffer; Steinshamn, Stein Ivar (Working Paper, Working paper; Working paper, 2001-05)Use is made of an economically optimal feedback rule to determine optimal levels of exploitation of a pelagic fish species. Data from the southern bluefin tuna fishery for the years 1960 - 1996 are utilised to apply this ... -
Implications of a nested stochastic/deterministic bio-economic model for a pelagic fishery
McDonald, A. David; Sandal, Leif Kristoffer; Steinshamn, Stein Ivar (Discussion paper, Working paper, 2001-03)Use is made of an economically optimal feedback rule to determine optimal levels of exploitation of a pelagic fish species. Data from the southern bluefin tuna fishery for the years 1960-1996 are utilized to apply this ... -
Irreversible Investments Revisited
Sandal, Leif Kristoffer; Steinshamn, Stein Ivar (Discussion paper, Working paper, 2006-07)A non-linear dynamic model in two state variables, two controls and three cost terms is presented for the purpose of finding the optimal combination of exploitation and capital investment in optimal renewable resource ... -
Kostnader i hjemmesykepleietjenesten : en studie for å avdekke årsaker til variasjon mellom enheter i Bergen kommune
Martinsen, Maren Hornes; Songve, Maria Bjørsvik (Master thesis, 2020)Fremtidsutsiktene for helsesektoren viser at etterspørsel for helsetjenester øker stadig. En sentral politisk målsetning innenfor norsk helsesektor er å tilrettelegge for at flere innbyggere skal kunne bo hjemme så lenge ... -
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 method for numerical and analytical solutions to a class of nonlinear optimal control problems
Sandal, Leif Kristoffer; Berge, Gerhard (Discussion paper, Working paper, 2004-02)Dynamic optimization problems cover a great class of problems in theoretical and applied economics and technology. In this account the exploitation of a general renewable capital stock is modeled through an alternative ... -
Mixed contracts for the newsvendor problem with real options
Jörnsten, Kurt; Nonås, Sigrid Lise; Sandal, Leif Kristoffer; Ubøe, Jan (Discussion paper, Working paper, 2011-04) -
More is less : the tax effects of ignoring flow externalities
Sandal, Leif Kristoffer; Steinshamn, Stein Ivar; Grafton, R. Quentin (Discussion paper, Working paper, 2000-11)Using a model of nonlinear decay of the stock pollutant, and starting from the same initial conditions, the paper shows that a tax that only corrects for stock externalities can, at the steady state, be higher than a tax ...