Basic Process Capability Indices: An Expository Review
β Scribed by Mohammed Z. Anis
- Book ID
- 110108718
- Publisher
- John Wiley and Sons
- Year
- 2008
- Tongue
- English
- Weight
- 186 KB
- Volume
- 76
- Category
- Article
- ISSN
- 0306-7734
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β¦ Synopsis
Summary
A review of the four basic process capability indices has been made. The interrelationship among these indices has been highlighted. Attention has been drawn to their drawbacks. The relation of these indices to the proportion nonconforming has been dwelt upon and the requirement of the adequate sample size has been emphasized. Cautionary remarks on the use of these indices in the case of nonnormal distributions, skewed distributions, and autocorrelated data are also presented. The effect of measurement error on process capability indices has been dealt with in great detail.
π SIMILAR VOLUMES
Numerous process capability indices, including C p , C pk , C pm , and C pmk , have been proposed to provide measures of process potential and performance. In this paper, we consider some generalizations of these four basic indices to cover non-normal distributions. The proposed generalizations are
When the distribution of a process characteristic is non-normal, C p and C pk calculated using conventional methods often lead to erroneous interpretation of the process's capability. Though various methods have been proposed for computing surrogate process capability indices (PCIs) under non-normal