Control Charts Applying a Sequential Test at Fixed Sampling Intervals ZACHARY G.STOUMBOS Rutgers,The State University of New Jersey.Newark.NJ07102-189 MARION R.REYNOLDS,JR. Virginia Polytechnic Institute and State University,Blacksburg.VA 24061-0499 chart d which var s the sampling rate at sampling points function charts and other variable samling rate versions of these charts.Guidelines are given for the desig of the proposed chart. Introduction cha sobserved from the process. Tha is,after a sam tive of detecting any change in a process that m e next sample practice is to take samples() process chang For example,l an F5 trol chart,however,car of the proc S W n orde lcmRieaedforxape nd A ces change.then the sampling rate should be low. tel(1990),Reynolds. and Arnold (1990) nger and Pi Several approaches to varving the sampling rate tiello(1991 993.R ,(1993),Stoumbos(1993 PTab ger (eynods Operations Research (RUT. earch on VSI charts has shown that on averag charts are matched to have the am average sam- Vol.29.No.1.January 1997 21 Reproduced with permission of the copyright owner.Further reproduction prohibited without permission.Reproduced with permission of the copyright owner. Further reproduction prohibited without permission. Control charts applying a sequential test at fixed sampling intervals Stoumbos, Zachary G; Reynolds, Marion R Jr Journal of Quality Technology; Jan 1997; 29, 1; ABI/INFORM Global pg. 21