log:Jan 1997:29,1;ABI/INFORM Global Control Charts for Quantile Function Values SCOTT D.GRIMSHAW Brigham Young University.Prowo,UT 84604 FRANK B.ALT University of Maryland,College Park,MD 20742 eneoatoidstnbCtonTggeersngheotoconm02tudo5miah2otgr0gceeo8fm differ in shape. Introduction which have similar goals,but are based on the third sample to unreasonable errors.Usually underer moment to measure the skewness of the in-control osaecosid control process will he ske d Therefore Shewhart range,but assume that the skewness of the target eotoptioegi nals.and the target yalue will es not c e hatoccasionalshif and Shaw (1991 attempt to find an adcauate transformation to re satisfactory from an economic pers ective but still sa tisfied the inspection riterionwith no ureso to normality.but they note that it is difficu le the oc h shif highe original measurement units.Bai and Choi (1995) results i leads to ex but th and degree of skewness in the sample data as mea- tion criterion.In addi harts often tall to di e the Often it is ignored that quite different probability Dr.Alt is an Associate Professo models can have ne arly equal summa distributed with mean I and standard deviation 1. Vol.29.No.1.January199 1 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 for quantile function values Grimshaw, Scott D; Alt, Frank B Journal of Quality Technology; Jan 1997; 29, 1; ABI/INFORM Global pg. 1