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Enriching demand forecasts with managerial information to improve inventory replenishment decisions: exploiting judgment and fostering learning

Rekik, Yacine, Glock, Christoph H. and Syntetos, Argyrios 2017. Enriching demand forecasts with managerial information to improve inventory replenishment decisions: exploiting judgment and fostering learning. European Journal of Operational Research 261 (1) , pp. 182-194. 10.1016/j.ejor.2017.02.001

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Abstract

This paper is concerned with analyzing and modelling the effects of judgmental adjustments to replenishment order quantities. Judgmentally adjusting replenishment quantities suggested by specialized (statistical) software packages is the norm in industry. Yet, to date, no studies have attempted to either analytically model this situation or practically characterize its implications in terms of ‘learning’. We consider a newsvendor setting where information available to managers is reflected in the form of a signal that may or may not be correct, and which may or may not be trusted. We show the analytical equivalence of adjusting an order quantity and deriving an entirely new one in light of a necessary update of the estimated demand distribution. Further, we assess the system’s behavior through a simulation experiment on theoretically generated data and we study how to foster learning to efficiently utilize managerial information. Judgmental adjustments are found to be beneficial even when the probability of a correct signal is not known. More generally, some interesting insights emerge into the practice of judgmentally adjusting order quantities.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Business (Including Economics)
Subjects: H Social Sciences > HD Industries. Land use. Labor
Uncontrolled Keywords: Inventory; Judgement; Judgmental adjustments; Newsvendor model; Learning
Publisher: Elsevier
ISSN: 0377-2217
Date of First Compliant Deposit: 20 February 2017
Date of Acceptance: 1 February 2017
Last Modified: 29 Jun 2019 06:05
URI: http://orca.cf.ac.uk/id/eprint/98101

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