Individuals charts and additional tests for changes in spread

Albert Trip and Jaap E. Wieringa
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Jaap E. Wieringa: Groningen University

No 03F33, Research Report from University of Groningen, Research Institute SOM (Systems, Organisations and Management)

Abstract: Some 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.

Date: 2003
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