What are the `primaryTests` used for in the cChart action?

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Réponse

The `primaryTests` parameter is used to request one or more tests for special causes (also known as Western Electric rules) for the primary control chart. These tests help detect non-random patterns in the data.
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cChart

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Other questions about cChart
How does the `sigmas` parameter affect the control limits? 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?
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