O'Reilly logo

Statistical Methods for Quality Improvement, Third Edition by THOMAS P. RYAN

Stay ahead with the world's most comprehensive technology and business learning platform.

With Safari, you learn the way you learn best. Get unlimited access to videos, live online training, learning paths, books, tutorials, and more.

Start Free Trial

No credit card required

CHAPTER 10

Miscellaneous Control Chart Topics

In this chapter we discuss several topics that, although important, would generally not be presented in individual chapters. These include pre-control, short-run SPC, charting autocorrelated data, nonparametric control chart approaches, Bayesian control chart methods, the economic design of control charts, administrative applications of control charts, software for control charting, and applications of control charts in specific industries and for specific company functions.

10.1 PRE-CONTROL

This topic is presented first in this chapter, not because of its importance but rather because many companies seem to have used it. Bhote (1991), Shainin (1984), Shainin and Shainin (1989), and others have claimed that pre-control is a superior alternative to control charts, and there is evidence (Bhote, 1988) that Motorola has used pre-control extensively. We will examine these claims and also discuss critical assessments of pre-control that have appeared in the literature (Ledolter and Swersey, 1997), as well as consider the properties of suggested modifications to pre-control. The properties of these modified procedures have been studied by Steiner (1997).

The first paper on pre-control was a technical report by Satterthwaite (1954). Pre-control was originally advocated for machining operations, for which an operator has to set up a machine and then determine whether or not the setup was performed properly. The contention has been that it is ...

With Safari, you learn the way you learn best. Get unlimited access to videos, live online training, learning paths, books, interactive tutorials, and more.

Start Free Trial

No credit card required