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Estimating the reorder point for a fill-rate target under a continuous review policy in the presence of non-standard lead-time demand distributions
Transportation Research Part E: Logistics and Transportation Review ( IF 10.6 ) Pub Date : 2022-06-10 , DOI: 10.1016/j.tre.2022.102766
John P. Saldanha

Skewed and multimodal lead-time demand (LTD) distributions can be present in supply chains. Under these conditions, logistics managers find that conventional approaches, which assume standard LTD distribution shapes, yield unreliable estimates of a single item’s reorder point (ROP) in relation to meeting fill-rate targets under a continuous review inventory policy. Furthermore, logistics managers have limited data available from which to determine the true shape of the underlying LTD distribution. In this study, I present a non-parametric bootstrap approach to set a least-biased estimate of the ROP. In addition, to deriving bootstrap expressions for non-standard LTD shapes, I derive expressions for standard distribution shapes to estimate the ROP across a range of fill rates. Thus, eliminating the double counting of stockouts with conventional fill-rate measures. Using Monte Carlo simulation experiments, I show that in comparison to the conventional state-of-the-art approaches the non-parametric bootstrap approach yields the least-biased ROP estimates robust to both the shape of the LTD distribution and the sample size. This research offers more accurate ROP estimators, which can serve as a basis for expanding the scope of future inventory management research and enabling logistics managers to reduce inventory while maintaining and even improving fill rates.



中文翻译:

在存在非标准提前期需求分布的情况下,根据持续审查政策估计填充率目标的再订货点

供应链中可能存在倾斜和多式联运的提前期需求 (LTD) 分布。在这些条件下,物流经理发现,假设标准 LTD 分布形状的传统方法,在持续审查库存政策下,与满足填充率目标相关,对单个项目的再订购点 (ROP) 产生不可靠的估计。此外,物流经理可用于确定潜在 LTD 分布的真实形状的数据有限。在这项研究中,我提出了一种非参数引导方法来设置 ROP 的最小偏差估计。此外,为了导出非标准 LTD 形状的引导表达式,我导出了标准分布形状的表达式,以估计在一系列填充率下的 ROP。因此,使用传统的填充率措施消除了重复计算缺货的情况。使用蒙特卡罗模拟实验,我表明,与传统的最先进的方法相比,非参数自举方法产生的最小偏差 ROP 估计对 LTD 分布的形状和样本大小都是稳健的。这项研究提供了更准确的 ROP 估算器,可以作为扩展未来库存管理研究范围的基础,使物流经理能够减少库存,同时保持甚至提高填充率。我表明,与传统的最先进的方法相比,非参数自举方法产生的最小偏差 ROP 估计对 LTD 分布的形状和样本大小都是稳健的。这项研究提供了更准确的 ROP 估算器,可以作为扩展未来库存管理研究范围的基础,使物流经理能够减少库存,同时保持甚至提高填充率。我表明,与传统的最先进的方法相比,非参数自举方法产生的最小偏差 ROP 估计对 LTD 分布的形状和样本大小都是稳健的。这项研究提供了更准确的 ROP 估算器,可以作为扩展未来库存管理研究范围的基础,使物流经理能够减少库存,同时保持甚至提高填充率。

更新日期:2022-06-11
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