The purpose of this research is to empirically test the salmon bias hypothesis, which states that the "healthy migrant" effect-referring to a situation in which migrants enjoy lower mortality risks than natives-is caused by selective return-migration of the weak, sick, and elderly. Using a unique longitudinal micro-level database-the Historical Sample of the Netherlands-we tracked the life cour...

the first international convention on maritime transportation is thebrussels’ convention of 1924. this convention was widely acceptedthroughout the world and; thus, lasted for a long time due to the widespreadsupport of the countries possessing fleet for this convention and the lack ofexistence of a legal document in terms of maritime transportation. thepassage of time together with innovations...

NP{hard cases of the single{item capacitated lot{sizing problem have been the topic of extensive research and continue to receive considerable attention. However, surprisingly few theoretical results have been published on approximation methods for these problems. To the best of our knowledge, until now no polynomial approximation method is known which produces solutions with a relative deviati...

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A Note on Ending Inventory Valuation in Multiperiod Production Scheduling Wilco van den Heuvel • Albert P.M. Wagelmans Econometric Institute Report EI 2002-25 Econometric Institute, Erasmus University Rotterdam, PO Box 1738, 3000 DR Rotterdam, The Netherlands [email protected] • [email protected] June 2002 In a recent paper, Fisher et al. (2001) present a method to mitigate end-effect...