• An agent-based computational approach to explaining persistent spatial unemployment disparities 

      McArthur, David Philip; Thorsen, Inge; Ubøe, Jan (Discussion paper, Working paper, 2008-09)
      This paper explores possible reasons for persistent spatial unemployment disparities using agent-based computational methods. The method relies on observing the actions of thousands of individuals within an artificial ...
    • Aggregation of gravity models for journeys-to-work 

      Ubøe, Jan (Discussion paper, Working paper, 2001)
      This paper deals with the use of gravity models to examine journeys-to-work. The purpose of the paper is to study very simple examples demonstrating that gravity models may be subject to serious misspecification in aggregate ...
    • A maximum entropy approach to the newsvendor problem with partial information 

      Andersson, Jonas; Jörnsten, Kurt; Nonås, Sigrid Lise; Sandal, Leif Kristoffer; Ubøe, Jan (Discussion paper;2011:14, Working paper, 2011-08)
      In this paper, we consider the newsvendor model under partial information, i.e., where the demand distribution D is partly unknown. We focus on the classical case where the retailer only knows the expectation and variance ...
    • A maximum entropy approach to the newsvendor problem with partial information 

      Andersson, Jonas; Jörnsten, Kurt; Nonås, Sigrid Lise; Sandal, Leif Kristoffer; Ubøe, Jan (Journal article; Peer reviewed, 2013)
      In this paper, we consider the newsvendor model under partial information, i.e., where the demand distribution D is partly unknown. We focus on the classical case where the retailer only knows the expectation and variance ...
    • Analyzing learning effects in the newsvendor model by probabilistic methods 

      Andersson, Jonas; Jörnsten, Kurt; Lillestøl, Jostein; Ubøe, Jan (Discussion paper;13/19, Working paper, 2019-10-11)
      In this paper, we use probabilistic methods to analyze learning effects in a behavioral experiment on the newsvendor model. We argue why we should believe that suggested orders follow a multinomial logit distribution, and ...
    • Benefit efficient statistical distributions on patient lists 

      Ubøe, Jan; Lillestøl, Jostein (Discussion paper, Working paper, 2006)
      In this paper we consider statistical distributions of different types of patients on the patient lists of doctors. In our framework different types of patients have different preferences regarding their preferred choice ...
    • Channel Coordination in a Multi-period Newsvendor Model with Dynamic, Price-dependent Stochastic Demand 

      Azad Gholami, Reza; Sandal, Leif K.; Ubøe, Jan (Discussion paper;6/16, Working paper, 2016-03-17)
      In this study, we extend the single-period newsvendor problem with stochastic demand into a multi-period and time-dependent one and find a solution for it. We analyze the multi-period newsvendor problem with stochastic ...
    • Congested interregional infrastructure, road pricing and regional labour markets 

      McArthur, David Philip; Thorsen, Inge; Ubøe, Jan (Discussion paper, Working paper, 2009-04)
    • Efficient statistical equilibria in markets 

      Jörnsten, Kurt; Ubøe, Jan (Discussion paper, Working paper, 2005)
      In this paper we will study statistical equilibria in commodity markets where agents have a specified utility attached to every transaction in their offer sets. A probability measure on the product of all offer sets is ...
    • An empirically based implementation and evaluation of a network model for commuting flows 

      Gitlesen, Jens Petter; Kleppe, Gisle; Thorsen, Inge; Ubøe, Jan (Discussion paper, Working paper, 2006)
      In this paper we present empirical results based on a network model for commuting flows. The model is a modified version of a construction introduced in Thorsen et al. (1999). Journeys-to-work are determined by distance ...
    • Employment, transport infrastructure and rural depopulation: a new spatial equilibrium model 

      McArthur, David Philip; Thorsen, Inge; Ubøe, Jan (Discussion paper;09/2013, Working paper, 2013-09)
      In this paper we propose a new spatial equilibrium model, and use it to discuss issues related to rural depopulation. The discussion focuses on how investments in transport infras- tructure and the spatial distribution ...
    • Explicit Solution Algorithms for Order and Price Postponement in Multi-periodic Channel Optimization 

      Azad Gholami, Reza; Sandal, Leif K.; Ubøe, Jan (Discussion paper;9/19, Working paper, 2019-09-09)
      Supply channels typically face uncertain and time-varying demand. Nonetheless, time-dependent channel optimization while addressing uncertain demand has received limited attention due to the high level of complexity of the ...
    • The impact of pecuniary costs on commuting flows 

      McArthur, David Philip; Kleppe, Gisle; Thorsen, Inge; Ubøe, Jan (Discussion paper, Working paper, 2010-05)
    • Markets With Memory: Dynamic Channel Optimization Models With Price-Dependent Stochastic Demand 

      Azad Gholami, Reza; Sandal, Leif K.; Ubøe, Jan (Discussion paper;8/19, Working paper, 2019-09-09)
      Almost every vendor faces uncertain and time-varying demand. Inventory level and price optimization while catering to stochastic demand are conventionally formulated as variants of newsvendor problem. Despite its ubiquity ...
    • A microeconomic approach to distance-deterrence functions in modeling journeys to work 

      Glenn, Paul; Thorsen, Inge; Ubøe, Jan (Discussion paper, Working paper, 2001)
      In this paper we suggest a microeconomic model for how commuting flows relate to traveling distance. Commuting is the preferred choice of a worker whenever he can obtain an increase in wages greater than the cost of ...
    • Misspecifications due to aggregation of data in models for journeys-to-work 

      Gitlesen, Jens Petter; Thorsen, Inge; Ubøe, Jan (Discussion paper, Working paper, 2004-10)
      In this paper we develop a new simulation procedure that can be used to examine validity of model extensions. Our testing regime is carried out on a number of different trip distribution models. We test the models on ...
    • 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)
    • Modeling freight markets for coal 

      Andersson, Jonas; Jörnsten, Kurt; Strandenes, Siri Pettersen; Ubøe, Jan (Discussion paper, Working paper, 2008-12)
      In this paper we study bulk shipping of coal between the central regions in the world. We compare the performance of cost-minimizing models with a gravity model approach. The main nding in the paper is that cost minimizing ...
    • Modeling Freight Markets for Coal 

      Ubøe, Jan; Andersson, Jonas; Jörnsten, Kurt; Strandenes, Siri Pettersen (Journal article; Peer reviewed, 2009)
      In this paper we study bulk shipping of coal between the central regions in the world. We compare the performance of cost-minimizing models with a gravity model approach. The main finding in the paper is that cost minimizing ...
    • Modeling heterogeneity in trip-distributions with partial information 

      Jörnsten, Kurt; Kleppe, Gisle; Thorsen, Inge; Ubøe, Jan (Discussion paper, Working paper, 2007)
      In this paper we propose a modified gravity model that takes into account that a population generally consists of heterogeneous groups, and we suggest a new statistical test for heterogeneity. We apply our new model to two ...