Showing 61 - 70 of 908
We consider the usefulness of the two-regime SETAR model for out-of-sample forecasting, and compare it with a linear AR model. A range of newly-developed forecast evaluation techniques are employed. Our simulation results show that time-series data need to exhibit a substantial degree of...
Persistent link: https://www.econbiz.de/10010731575
With the increasing interest in decision support systems and the continuous advance of computer science, revenue management is a discipline which has received a great deal of interest in recent years. Although revenue management has seen many new applications throughout the years, the main focus...
Persistent link: https://www.econbiz.de/10010731576
We consider tests for sudden changes in the unconditional volatility of conditionally heteroskedastic time series based on cumulative sums of squares. When applied to the original series these tests suffer from severe size distortions, where the correct null hypothesis of no volatility change is...
Persistent link: https://www.econbiz.de/10010731577
Nowadays railway companies are confronted with high infrastructure maintenance costs. Therefore good strategies are needed to carry out these maintenance activities in a most cost effective way. In this paper we solve the preventive maintenance scheduling problem (PMSP) using genetic algorithms,...
Persistent link: https://www.econbiz.de/10010731578
In this paper we study a class of quadratic maximization problems and their semidefinite programming (SDP) relaxation. For a special subclass of the problems we show that the SDP relaxation provides an exact optimal solution. Another subclass, which is ${\\cal NP}$-hard, guarantees that the SDP...
Persistent link: https://www.econbiz.de/10010731579
We study stochastic linear--quadratic (LQ) optimal control problems over an infinite horizon, allowing the cost matrices to be indefinite. We develop a systematic approach based on semidefinite programming (SDP). A central issue is the stability of the feedback control; and we show this can be...
Persistent link: https://www.econbiz.de/10010731580
Ports provide a number of logistical choices concerning storage, onward transport, and postponement. We investigate the routing flexibility offered by ports with a central location with respect to the hinterland. This flexibility is investigated using an illustrative case in which a number of...
Persistent link: https://www.econbiz.de/10010731581
This paper demonstrates that the class of conditionally linear and Gaussian state-space models offers a general and convenient framework for simultaneously handling nonlinearity, structural change and outliers in time series. Many popular nonlinear time series models, including threshold, smooth...
Persistent link: https://www.econbiz.de/10010731582
Each year the Dutch magazine Elsevier publishes the results of surveys amongst students concerning the perceived quality of academic studies. Unfortunately, the original survey data are not publicly available. We therefore repeat the survey for economics students in Maastricht and Rotterdam, as...
Persistent link: https://www.econbiz.de/10010731583
We conjecture that individual purchases of counterfeit products could be motivated by income and prices, but that another driver is cultural norms. To put the latter conjecture to an empirical test we make use of the unique situation of Surinamese people who live in Suriname and in the...
Persistent link: https://www.econbiz.de/10010731584