How does the `sigmas` parameter affect the control limits?

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Réponse

The `sigmas` parameter specifies the width of the control limits as a multiple of the standard error of the subgroup summary statistic. The default value is 3, corresponding to 3-sigma limits.
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What pattern is identified by `test2`? How does the action handle subgroups with varying sample sizes? What does the `allN` parameter do in the cChart action? 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?
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