bullwhip(SCperf)
bullwhip()所属R语言包:SCperf
bullwhip effect
牛鞭效应
译者:生物统计家园网 机器人LoveR
描述----------Description----------
bullwhip computes the increase of the demand variability (the bullwhip effect) for a simple two-stage supply chains consisting of a single retailer and a single manufacturer using three forcasting methods: Minimum Mean Square Error (MMSE), Simple Moving Average (SMA) and Exponential Smoothing (ES) when the demand follows a known stationary AR(1) stochastic process.
bullwhip计算增加的需求变化的一个简单的两阶段供应链组成一个单一的零售商和制造商使用三种测报方法:最小均方误差(MMSE),简单移动平均线(牛鞭效应) (SMA),指数平滑法(ES)的需求时,遵循一个已知的固定AR(1)随机过程。
用法----------Usage----------
bullwhip(method = c("MMSE", "SMA", "ES"), phi, L, p, alpha)
参数----------Arguments----------
参数:method
character string specifing which method to use,
字符串specifing所使用的方法,
参数:phi
a vector of autoregressive parameters,
一个向量的自回归参数,
参数:L
a positive lead-time,
一个积极的交货时间,
参数:p
the order to be used in the SMA method,
的SMA方法中要使用的顺序,
参数:alpha
smoothing factor to be used in the ES method (0 < alpha < 1).
中要使用的ES法(0 <α<1)的平滑因子。
Details
详细信息----------Details----------
The bullwhip effect is commonly defined as the ratio between the unconditional variance of the order process to that of the demand process, Var(O_t)/Var(d_t). If this ratio is equal to one there is no variance amplification, while a ratio greater than one means that the bullwhip effect is present. On the other hand, a ratio less than one means that the orders are smoothed if compared with the demand.
牛鞭效应的需求之间的比例的无条件方差秩序的过程,通常定义,Var(O_t)/Var(d_t)。如果该比率等于1,有没有方差放大,而的比例大于的手段之一,牛鞭效应是本。另一方面,比率小于1装置的订单进行平滑处理,如果与需求相比。
值----------Value----------
The measure for the bullwhip effect.
牛鞭效应的措施。
(作者)----------Author(s)----------
Marlene Silva Marchena <a href="mailto:marchenamarlene@gmail.com">marchenamarlene@gmail.com</a>
参考文献----------References----------
D. (2000a) Quantifying the bullwhip effect in a simple supply chain: the impact of forecasting, lead times and information. Management Science, v.46, n.3, p. 436-443.
under a generalized demand process. http://arxiv.org/abs/1009.397
effect, International Journal of Production Economics.l, v.88, n.1, p. 15-27.
参见----------See Also----------
SCperf
SCperf
实例----------Examples----------
bullwhip("SMA",0.9,2,4)
bullwhip("ES",0.9,2,0,0.6)
bullwhip("MMSE",0.9,2)
转载请注明:出自 生物统计家园网(http://www.biostatistic.net)。
注:
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