Using Counts to Monitor a Process Mean

Article

Farnum, Nicholas R.; Stanton, LaVerne W.   (1986, ASQC)   California State University

Journal of Quality Technology    Vol. 18    No. 1
QICID: 5545    January 1986    pp. 22-28
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Article Abstract

A procedure for controlling a process mean to a target midway between two specified values is presented. It is assumed that the process variable has a normal distribution with unknown mean and variance, and that the data consists solely of counts of the number of observations in a sample which are above, below, and between specified gauge values. Charts are given for conveniently accomplishing the test and for estimating the amount of adjustment needed. Finally, the choice of gauge limits is discussed and comparisons are made with variables procedures.

Keywords

Process control,Gauges,Precontrol


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