不(bu)同的預測(ce)與(yu)提前(qian)期(qi)間隔。通(tong)常庫存(cun)中會有多種(zhong)物(wu)品,而每(mei)種(zhong)都有不(bu)同的提前(qian)期(qi),實際需求(qiu)的記錄與(yu)預測(ce)值,通(tong)常是以(yi)每(mei)周或(huo)每(mei)月為基礎的,并(bing)且是針對所有物(wu)品,而不(bu)考慮其(qi)提前(qian)期(qi)。針對每(mei)個(ge)不(bu)同的提前(qian)期(qi)來衡量(liang)需求(qiu)變化的平均(jun)值幾乎(hu)不(bu)可能(neng)。
因此,需要(yao)研究一(yi)(yi)些方(fang)法來調整不(bu)同時(shi)間(jian)(jian)間(jian)(jian)隔的標(biao)準(zhun)(zhun)差(cha)(cha)(cha)。如果(guo)(guo)提前期(qi)(qi)為(wei)零,標(biao)準(zhun)(zhun)差(cha)(cha)(cha)也為(wei)零,提前期(qi)(qi)增(zeng)加,標(biao)準(zhun)(zhun)差(cha)(cha)(cha)也跟著增(zeng)加。然(ran)而,標(biao)準(zhun)(zhun)差(cha)(cha)(cha)并不(bu)與提前期(qi)(qi)呈(cheng)(cheng)線性(xing)相關,例如提前期(qi)(qi)為(wei)一(yi)(yi)周的標(biao)準(zhun)(zhun)差(cha)(cha)(cha)為(wei)100,而提前期(qi)(qi)四周的標(biao)準(zhun)(zhun)差(cha)(cha)(cha)不(bu)一(yi)(yi)定為(wei)400。因為(wei)標(biao)準(zhun)(zhun)差(cha)(cha)(cha)不(bu)可能在四周內都(dou)呈(cheng)(cheng)線性(xing)增(zeng)加,間(jian)(jian)隔時(shi)間(jian)(jian)增(zeng)加,效果(guo)(guo)會減緩,間(jian)(jian)隔時(shi)間(jian)(jian)越長,效果(guo)(guo)減緩程度越明顯,可對(dui)標(biao)準(zhun)(zhun)差(cha)(cha)(cha)或(huo)安(an)全庫存(cun)做如下調整,以期(qi)(qi)彌補(bu)提前期(qi)(qi)時(shi)間(jian)(jian)間(jian)(jian)隔和預測時(shi)間(jian)(jian)間(jian)(jian)隔之(zhi)差(cha)(cha)(cha)的之(zhi)間(jian)(jian)的差(cha)(cha)(cha)異。
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