Individuals charts and additional tests for changes in spread
AbstractSome authors recommend the use of an additional test for detecting increases in the spread, when using a control chart for individual observations. We examine this recommendation both in a practical situation and theoretically. Both studies show that the additional test gives somewhat more power for detecting a 25% increase of the process variation. For nearly all other deviations from the in-control state the test is more likely to cause confusion. From a practical viewpoint we therefore advise against its use.
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Bibliographic InfoPaper provided by University of Groningen, Research Institute SOM (Systems, Organisations and Management) in its series Research Report with number 03F33.
Date of creation: 2003
Date of revision:
This paper has been announced in the following NEP Reports:
- NEP-ALL-2003-12-07 (All new papers)
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