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Individuals charts and additional tests for changes in spread

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  • Trip, Albert
  • Wieringa, Jaap E.

    (Groningen University)

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    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.

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    File URL: http://irs.ub.rug.nl/ppn/256398003
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    Bibliographic Info

    Paper provided by University of Groningen, Research Institute SOM (Systems, Organisations and Management) in its series Research Report with number 03F33.

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    Date of creation: 2003
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    Handle: RePEc:dgr:rugsom:03f33

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