Forecasting of compound Erlang demand

Aris A Syntetos, Mohamed Zied Babai and Shuxin Luo
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Aris A Syntetos: Cardiff University, Cardiff, UK
Mohamed Zied Babai: KEDGE Business School, Talence, France
Shuxin Luo: Hebei University of Science and Technology, Shijiazhuang, People’s Republic of China

Journal of the Operational Research Society, 2015, vol. 66, issue 12, 2061-2074

Abstract: Intermittent demand items dominate service and repair inventories in many industries and they are known to be the source of dramatic inefficiencies in the defence sector. However, research in forecasting such items has been limited. Previous work in this area has been developed upon the assumption of a Bernoulli or a Poisson demand arrival process. Nevertheless, intermittent demand patterns may often deviate from the memory-less assumption. In this work we extend analytically previous important results to model intermittent demand based on a compound Erlang process, and we provide a comprehensive categorisation scheme to be used for forecasting purposes. In a numerical investigation we assess the benefit of departing from the memory-less assumption and we provide insights into how the degree of determinism inherent in the process affects forecast accuracy. Operationalised suggestions are offered to managers and software manufacturers dealing with intermittent demand items.

Date: 2015
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