路过看看

xiexie

好东西

理论联系实际，好东西

看看先

非常好，谢谢楼主！

vb aisg看来是个很好很实用的工具了。

太贵了

新手，还没币呢

谢谢

路过，我没有钱

飘过看看

kankanxian

可以寫出內容嗎???有點貴............想先看看

还要那么多钱，路过。。。。

真可惜，我没有钱

guigiugioghiohioh

支持一下

安得免费资料千千万,大庇天下寒士俱欢颜！

太贵了吧

谢谢分享

神啊  这么贵  结果据说还打不开  黑不黑

顺便在这问个问题，有人能帮忙解答一下吗？
The replenishment lead time is different from the standard time period (For example, weekly or monthly) used to collect demand data. We need a way to compute σm from σ1, where σ1 refers to the standard deviation of demand over the standard time period. For example, the lead time is three weeks and the standard time period is one week. Consider the lead time demands as the sum of three weekly random demands. Then if the weekly demands are independent, the variances of the sum equals to the sum of the variances:

(σm)^2=(σ1)^2+(σ1)^2+(σ1)^2=3(σ1)^2

So that: σm=3^(1/2)σ1

If L is the length of lead time, then general formula is:

σL=L^(1/2)σ1

hiuhiohiohiohio

ygygygygygygyg

最近发现物价涨了，这个上面的资料价格涨的更快呢！

好贵...

就是有钱，风险也不小

真黑啊