Chapter 2. Identifying and Controlling Sampling and Testing Errors in SPC
- William Smothers
Published Online: 28 MAR 2008
Copyright © 1986 The American Ceramic Society, Inc.
Applications of Refractories: Ceramic Engineering and Science Proceedings, Volume 7, Issue 1/2
How to Cite
Sheldon, P. N. and Landy, R. A. (1986) Identifying and Controlling Sampling and Testing Errors in SPC, in Applications of Refractories: Ceramic Engineering and Science Proceedings, Volume 7, Issue 1/2 (ed W. Smothers), John Wiley & Sons, Inc., Hoboken, NJ, USA. doi: 10.1002/9780470320310.ch2
- Published Online: 28 MAR 2008
- Published Print: 1 JAN 1986
Print ISBN: 9780470374443
Online ISBN: 9780470320310
- mean value
The method of measurement or analysis is not perfectly repeatable and the material is not perfectly homogeneous so repeat analyses and samples will differ among themselves. One needs to carry out multiple measurements or analyses on more than one sample from a rational subgroup in order to estimate the two types of errors that arise due to analysis and sampling. Techniques are presented by which variations associated with defined sources may be isolated and estimated.