What does the 'sigmas' parameter do?

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Réponse

The 'sigmas' parameter defines the width of the control limits. It is a multiple of the standard error of the subgroup summary statistic. The default value is 3, which creates standard 3-sigma control limits.
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What pattern is identified by `test2`? Can I run tests for special causes if my control limits are not 3-sigma? What is the mandatory parameter for using the cChart action? What does the `allN` parameter do in the cChart action? How does the `sigmas` parameter affect the control limits?
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