
【經】 statistical stock control
【醫】 statistics
【經】 numerical statement; statistics
repertory; reserve; stock; stockpile; storage
【化】 stock
【經】 inventories; on hand; stock; stocks; store; treasury
control; dominate; desist; grasp; hold; manage; master; predominate; rein
rule
【計】 C; control; controls; dominance; gated; gating; governing
【醫】 control; dirigation; encraty
【經】 check; command; control; controlling; cost control; dominantion
monitoring; regulate; rig
Statistical Inventory Control (SIC) refers to a systematic approach in supply chain management that utilizes statistical methods and historical data to determine optimal inventory levels, minimizing costs while ensuring adequate product availability to meet customer demand. It moves beyond simple rules-of-thumb by applying probability theory and forecasting techniques to account for demand variability and lead time uncertainty. The core objective is to balance the costs associated with holding inventory (carrying costs) against the costs of running out of stock (stockout costs) and the costs of placing orders (ordering costs).
The fundamental principle underpinning SIC is the recognition that both customer demand and supplier lead times are not constant but exhibit variability. Statistical models, often assuming demand follows patterns like a normal distribution, are employed to analyze historical sales data and forecast future demand. This analysis allows businesses to calculate key parameters:
Using these parameters, SIC systems calculate two critical control points:
Reorder Point (ROP): The inventory level at which a new order should be placed to replenish stock before it runs out. It's calculated to cover expected demand during the lead time plus a buffer (safety stock) to absorb unexpected demand surges or delivery delays. A common formula is: $$ROP = (Average Demand per Day times Lead Time in Days) + Safety Stock$$
Safety Stock: Extra inventory held specifically to buffer against uncertainties in demand and supply. The required safety stock level increases with higher demand variability, longer or more variable lead times, and the desired service level (probability of not stocking out). A basic formula considering demand variability during lead time is: $$Safety Stock = Z times sigma_{LT}$$ Where:
Implementing SIC effectively requires accurate data collection, robust forecasting methods, and regular review of the statistical parameters and service level targets. Modern inventory management software often incorporates SIC principles, automating calculations and order generation based on real-time data. This approach is crucial for businesses aiming to optimize working capital tied up in inventory while maintaining high customer satisfaction through reliable product availability.
References:
統計性的庫存控制是指通過統計分析曆史數據、市場需求及供應鍊信息,動态調整庫存策略的管理方法。其核心是通過數學模型和統計工具優化庫存水平,平衡供需關系,降低成本和風險。以下是詳細解釋:
如需進一步了解具體模型(如EOQ公式),可參考來源、4、5、7、8中的詳細分析。
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