Individuals charts and additional tests for changes in spreadTrip, A. & Wieringa, J. E., 2003, s.n., 19 p.
Research output: Working paper › Academic
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.
|Number of pages||19|
|Publication status||Published - 2003|
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