Blar i NHH Brage på forfatter "Ubøe, Jan"

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 ... 
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, 201108)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 ... 
Adjusting for Cell Suppression in Commuting Trip Data
Braathen, Christian; Thorsen, Inge; Ubøe, Jan (Discussion paper;13/22, Working paper, 20221213)Maximum entropy methods are used to infer the true tripdistribution matrix in cases where parts of the data are suppressed due to privacy concerns. Large proportions of the suppressed data are found to be inferred correctly ... 
An agentbased computational approach to explaining persistent spatial unemployment disparities
McArthur, David Philip; Thorsen, Inge; Ubøe, Jan (Discussion paper, Working paper, 200809)This paper explores possible reasons for persistent spatial unemployment disparities using agentbased computational methods. The method relies on observing the actions of thousands of individuals within an artificial ... 
Aggregation of gravity models for journeystowork
Ubøe, Jan (Discussion paper, Working paper, 2001)This paper deals with the use of gravity models to examine journeystowork. The purpose of the paper is to study very simple examples demonstrating that gravity models may be subject to serious misspecification in aggregate ... 
Analyzing learning effects in the newsvendor model by probabilistic methods
Andersson, Jonas; Jörnsten, Kurt; Lillestøl, Jostein; Ubøe, Jan (Discussion paper;13/19, Working paper, 20191011)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 Multiperiod Newsvendor Model with Dynamic, Pricedependent Stochastic Demand
Azad Gholami, Reza; Sandal, Leif K.; Ubøe, Jan (Discussion paper;6/16, Working paper, 20160317)In this study, we extend the singleperiod newsvendor problem with stochastic demand into a multiperiod and timedependent one and find a solution for it. We analyze the multiperiod newsvendor problem with stochastic ... 
Congested interregional infrastructure, road pricing and regional labour markets
McArthur, David Philip; Thorsen, Inge; Ubøe, Jan (Discussion paper, Working paper, 200904) 
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). Journeystowork 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, 201309)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 Multiperiodic Channel Optimization
Azad Gholami, Reza; Sandal, Leif K.; Ubøe, Jan (Discussion paper;9/19, Working paper, 20190909)Supply channels typically face uncertain and timevarying demand. Nonetheless, timedependent 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, 201005) 
Markets With Memory: Dynamic Channel Optimization Models With PriceDependent Stochastic Demand
Azad Gholami, Reza; Sandal, Leif K.; Ubøe, Jan (Discussion paper;8/19, Working paper, 20190909)Almost every vendor faces uncertain and timevarying 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 distancedeterrence 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 journeystowork
Gitlesen, Jens Petter; Thorsen, Inge; Ubøe, Jan (Discussion paper, Working paper, 200410)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, 201104) 
Modeling freight markets for coal
Andersson, Jonas; Jörnsten, Kurt; Strandenes, Siri Pettersen; Ubøe, Jan (Discussion paper, Working paper, 200812)In this paper we study bulk shipping of coal between the central regions in the world. We compare the performance of costminimizing 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 costminimizing models with a gravity model approach. The main finding in the paper is that cost minimizing ...